Installation Manual
Models
24A715,
24A715M
Master Time/Program Clock
Document No. 427-12-00014 (02)
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NOTICE
To ensure the performance of our products and systems, we may occasionally make tech-
nological changes and updates. Therefore, the model number suffixes (A, B, C, etc.)
listed in the manual or in the drawings may not always match the model you are using.
Unless specifically noted, this will not affect the product or its installation, operation, or
service.
FCC COMPLIANCE STATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
WARNING: Changes or modifications to this product not expressly approved by
the party responsible for compliance could void the user’s authority to operate this
equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or tele-
vision reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio TV technician for help.
This Class B digital apparatus complies with Canadian ICES-003.
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FOR UNITS EQUIPPED WITH AN INTERNAL MODEM (24A715M)
NOTICE: This equipment complies with Part 68 of the FCC Rules. On the mounting
panel of this equipment is a label that contains, among other information, the FCC Regis-
tration Number and Ringer Equivalence Number (REN) for this equipment. If requested,
provide this information to your Telephone Company.
The registration jack USOC for this equipment is (RJ-11). An FCC-compliant telephone
cord and modular plug is provided with this equipment. This equipment is designed to
connect to the telephone network or premises wiring using a compatible modular jack,
which is Part 68 compliant. See installation instructions for details.
The REN is useful to determine the quantity of devices that may be connected to the tele-
phone line. Excessive RENs on the telephone line may result in the devices not ringing in
response to an incoming call. In most, but not all areas, the sum of REN of all devices
should not exceed five (5). To be certain of the number of devices that may be connected
to a line, as determined by the total REN, contact the local Telephone Company.
If your telephone equipment (Modem) causes harm to the telephone network, the Tele-
phone Company will notify you in advance that temporary discontinuance of service may
be required, but if advance notice isn’t practical, you will be notified as soon as possible.
You will be advised of your right to file a complaint with the FCC if you believe it is
necessary.
Your Telephone Company may make changes in its facilities, equipment, operations,
or procedures that could affect the operation of your equipment. If they do, you will be
given advance notice so as to give you an opportunity to maintain uninterrupted service.
This equipment may not be used on public coin service provided by the Telephone
Company. Connection to party lines is subject to state tariffs. (Contact your state public
utility commission or corporation commission for information.)
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SUPPLIER’S DECLARATION OF CONFORMITY
Place of Issue: St. Charles, IL
Date of Issue: August 17, 2001
Dukane Corporation, located at 2900 Dukane Drive, St. Charles, IL 60174 in the United
States of America, hereby certifies that Master Clock model 24A715M bearing labeling
identification number US:A95DT06B24A715M complies with the Federal Communica-
tions Commission’s (“FCC”) Rules and Regulations 47 CFR Part 68, and the
Administrative Council on Terminal Attachments (“ACTA”)—adopted technical criteria:
TIA/EIA/IS-968, Telecommunications—Telephone Terminal Equipment—Technical Re-
quirements for Connection of Terminal Equipment to the Telephone Network, July 2001.
R olf G oehler
Rolf Goehler
General Manager, Communications Systems Division
NOTICE: The Industry Canada label identifies certified equipment. This certification
means that the equipment meets certain telecommunications network protective, opera-
tional and safety requirements. The Industry Canada does not guarantee the equipment
will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be con-
nected to the facilities of the local Telecommunications Company. This equipment must
also be installed using an acceptable method of connection. In some cases, the company’s
inside wiring associated with a single line individual service may be extended by means
of a certified connector assembly (telephone extension cord). The customer should be
aware that compliance with the above conditions may not prevent degradation of service
in some situations.
Any equipment repairs made by the user, or equipment malfunctions, may give the Tele-
communications Company cause to request the user to disconnect the equipment.
Users should ensure, for their own protection, that the electrical ground connections of
the power utility, telephone lines, and internal metallic water pipe system, if present, are
connected together. This precaution may be particularly important in rural areas.
CAUTION: Users should not attempt to make such connections themselves, but should
contact the appropriate electric inspection authority or electrician, as appropriate.
NOTE: The Ringer Equivalence Number (REN) assigned to each terminal device pro-
vides an indication of the maximum number of terminals allowed to be connected to a
telephone interface. The termination of an interface may consist of any combination of
devices subject only to the requirement that the sum of the Ringer Equivalence Numbers
of all the devices does not exceed five (5).
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A NOTE ABOUT THE LITHIUM BATTERY
The Lithium Battery (coin cell) contained in this product is NOT user-replaceable. When
replaced by an authorized Service Center, used batteries should be disposed of according
to the manufacturer’s instructions.
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Table
of
Contents
SECTION 1—INSTALLATION
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Mounting the Master Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Surface Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Semi-Flush Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Using the Installer’s Hooks to Hang the Display Below the Backbox . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Wiring the Master Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Wiring Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Synchronizing Non-Compatible Clocks by External Pulse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
SECTION 2—CONFIGURATION
Setting Up the Master Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Programming Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Programming Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Entering the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Setting the Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Enabling the Relays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Choosing the Clock Types to Synchronize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Manually Activating Bell Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Testing the Bells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Setting Daylight Saving Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Setting Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Securing the Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
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SECTION 3—FUNCTION LIST
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Quick Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
[*] READ STATUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
[1] VIEW EDIT KEYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
[3] 12/24 HOUR TOGGLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Programming Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
[0]=PASSWORD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
[1]=SET DATE / TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
[2]=SELECT CLOCK CTL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
[3]=MANUAL BELL CTRL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
[4]=PROGRAM SCHEDULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
[5]=SCHEDULE CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
[6]=ENABLE CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
[7]=DAYLIGHT SAVINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
[8]=CHANGE SCHEDULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
[9]=SYNCH. CLOCKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
[A]=PROGRAM HOLIDAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
[B]=COMMUNICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
[C]=CHANGE PASSWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
AUTO BELL TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
APPENDIX A—DAYLIGHT SAVING COUNTRY CODES
Daylight Saving Country Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Daylight Saving Time Codes and Duration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
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APPENDIX B—SECONDARY CLOCK TYPES
Secondary Clock Type Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Wiring Secondary Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Type 01—Synchronous Wired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Type 02—Three-Wire Minute Impulse (59th Minute). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Type 02—Two-Wire Reverse Polarity Minute Impulse (59th Minute) . . . . . . . . . . . . . . . . . . . . . . . B-5
Type 03—Standard Electric Synchronous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
Type 04—Standard Electric Time AR-2A Two-Wire, Dual Voltage . . . . . . . . . . . . . . . . . . . . . . . . B-7
Type 05—Three-Wire Minute Impulse (58th Minute). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Type 06—Synchronous Wired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
Type 07—Dukane Digital Clocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10
Type 08—Rauland 2410 Digital Clocks (24Vac and 120Vac). . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12
Type 09—Simplex 59th Minute, Dual Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14
Type 10—Simplex 45th Minute, Dual Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14
Type 11—Edwards Dual Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-15
Type 12—Cincinnati D6 Clocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-16
Type 13—Two-Wire Pulse Alternating (24Vdc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17
Type 14—Electronic Coded Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-18
Type 15—Straight Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-20
Type 16—Three-Wire Minute Impulse (59th Minute) with 12-Hour Correction . . . . . . . . . . . . . . B-21
Type 16—Two-Wire Reverse Polarity Minute Impulse (59th Minute) with 12-Hour Correction. . B-22
Type 17—Standard Electric Time AR-3 Three-Wire Impulse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-23
Type 18—National Synchronous Wired. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-24
Type 19—Stromberg Synchronous Wired (56th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-25
Type 20—Three-Wire Minute Impulse (44th Minute). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-26
Type 21—Cincinnati D1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-27
Type 22—Dukane Synchronous Wired (24A Series, Obsolete). . . . . . . . . . . . . . . . . . . . . . . . . . . . B-28
Type 23—Condor Digital Clocks (Model 2412) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-29
Type 24—Edwards Synchronous Wired Clocks, Type E1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-30
Type 27—Simplex 2310 Dual Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-31
Types 28, 29, and 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-31
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APPENDIX C—WIRING DIAGRAMS
Wiring Diagrams List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Wiring the Master Clock for 120Vac or 220/240Vac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Wiring Signal Devices to the Master Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Wiring the Communications Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Wiring the Host Communications Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Wiring the DDC4R Communications Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
Wiring RS-485 Time Synchronization Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Using the Master Clock as a Slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Wiring the 12 Volt AC Out Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
Strain Relief for the Communications Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
Connecting a Computer to the Front Access Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
APPENDIX D — POWER SUPPLY SCHEMATIC
Power Supply Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
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FIGURES
1-1 Master Clock Wall-Mount Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-2 Hook Mounting the Display Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1-3 L Brackets for Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1-4 Plugging Quick Connects into the Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
1-5 Master Clock Terminal Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3-1 Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3-2 Edit Keys Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
B-1 Three-Wire Synchronous (59th Minute, Dukane 24SS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
B-2 Three-Wire Minute Impulse (59th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
B-3 Two-Wire Reverse Polarity Minute Impulse (59th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
B-4 Standard Electric Synchronous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
B-5 Standard Electric Time AR-2A Two-Wired, Dual Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
B-6 Three-Wire Minute Impulse (58th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
B-7 Synchronous Wired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
B-8 Wiring Dukane 24F200, 24F750, and 24F750A Digital Clocks for 15Vdc . . . . . . . . . . . . . . . . . B-11
B-9 Wiring Dukane 24D20 and 24D40 Digital Clocks for 24Vac . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11
B-10 Wiring Rauland 2410 Digital Clocks for 120Vac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13
B-11 Wiring Rauland 2410 Digital Clocks for 24Vac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13
B-12 Simplex 59th and 45th, Dual Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14
B-13 Edwards Dual Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-15
B-14 Cincinnati D6 Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-16
B-15 Two-Wire Pulse Alternating (24Vdc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17
B-16 Electronic Coded Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-19
B-17 Straight Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-20
B-18 Three-Wire Minute Impulse (59th Minute) with 12-Hour Correction. . . . . . . . . . . . . . . . . . . . . . B-21
B-19 Two-Wire Minute Impulse (59th Minute) with 12-Hour Correction. . . . . . . . . . . . . . . . . . . . . . . B-22
B-20 Standard Electric Time AR-3 Three-Wire Impulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-23
B-21 National Synchronous Wired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-24
B-22 Stromberg Synchronous Wired (56th Minute). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-25
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Table
of
Contents
B-23 Three-Wire Minute Impulse (44th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-26
B-24 Cincinnati D1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-27
B-25 Dukane Synchronous Wired (24A Series, Obsolete). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-28
B-26 Condor Digital Clocks (Model 2412) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-29
B-27 Edwards Synchronous Wired Clocks, Type E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-30
B-28 Simplex 2310 Dual Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-31
C-1 Wiring the 24A715/M for 120Vac Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
C-2 Wiring the 24A715/M for 220/240Vac Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
C-3 Typical Signal Device Wiring—Terminal Block P1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C-4 Typical Signal Device Wiring—Terminal Block P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C-5 Typical Signal Device Wiring—Terminal Block P3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C-6 The Communications Terminal Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
C-7 RS-232 Cable for Permanent Connection to the Communications Terminal Block . . . . . . . . . . . . C-5
C-8 Synchronizing RS-485 Time Synchronization Devices Without a Buffer . . . . . . . . . . . . . . . . . . . C-6
C-9 Using the Master Clock as a Slave to Allow 30 Extra RS-485 Time Synchronizing Devices . . . . C-6
C-10 Example of Cable Strain Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
C-11 Computer Cable for Front Access Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
D-1 Power Supply Schematic for the 24A715/M Master Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
TABLES
2-1 Relay Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
3-1 READ STATUS Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3-2 List of Edit Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Windows is a registered trademark of Microsoft Corporation.
MasterLink is a trademark of Lathem Time Corporation.
vi
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Section
Installation
1
General Information
This installation manual covers the Model 24A715 and 24A715M Master Clocks. Both
clocks are installed and programmed in similar fashions. The main difference between
the clocks is the 24A715M is equipped with a built-in modem capable of communicating
with a PC, or for synchronizing with the NIST Atomic Clock. Both clocks have eight cir-
cuits that can be programmed to ring bells or activate circuits for up to 99 seconds, and/or
synchronize the time on three types of clock systems (any two manufacturing brands of
clocks listed in Appendix B, plus compatible RS-485 time synchronization devices). You
can program up to 512 events to activate single or multiple circuits on a given day and
time. The 24A715M can also connect to a PC running Microsoft Windows® using op-
tional MasterLink™ software available from Lathem.
Unless otherwise specified, “master clock” refers to both units in this document.
The master clock can be programmed with these functions:
• User password
• Date and time
• Clock types to synchronize
• Manual bell control (example: sounding a fire alarm)
• Bell schedules (with events lasting up to 99 seconds)
Note: If a contact closurer in excess of 99 seconds is required, an external
latching relay will be required. This relay is not supplied by Dukane.
• Dates when automatic schedule changes go into effect
• Manual circuit disabling (example: for safety during maintenance)
• Daylight saving time features
• Instant bell schedule changes
• Instant clock synchronization
• Holiday schedules
• Communications when using the master clock with an RS-485 network, modem
access, or the optional MasterLink programming software (available from Lathem)
Parts List
Verify that the master clock came with these parts:
• Master clock (ready to surface mount)
• User guide (document number 427-07-00047)
• Installation hardware kit with mounting screws and two extra cover screws
• Two L-brackets used for rack mounting
• Power supply box cover used for rack mounting
continued
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Optional equipment (ordered separately from Lathem):
• Connection cable if the power supply relay PCB is up to 8 feet (2.4 m) from the
display unit
• Lathem MasterLink programming software to control the master clock from a PC
• Standalone modem
• Remote schedule selector switch
Mounting the Master Clock
The master clock is shipped ready to surface mount on a wall. It can also be semi-flush
mounted with the power supply recessed into the wall, or installed in a standard 19-inch
be hung on the wall with the power supply hidden in the floor or ceiling; contact Lathem
for details.
A qualified technician should install the master clock. The installation does not require
any special tools, but may require extra hardware, wire, or other materials as required by
local electrical codes.
Power Supply Backbox
Side Screw Hole
Display Unit
Wall Mount Plate
Figure 1-1
Master Clock Wall-Mount Assembly Parts
1-2
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Surface Mounting
To surface mount the master clock:
1. Place the master clock on its back with the display unit facing up and the key pad to
the right.
2. Remove the two screws at the top of the display unit mounting plate.
3. Lift the display unit up and away from the backbox. Two rivets at the bottom of the
cover will prevent you from lifting it straight up.
4. Unplug the ribbon cable from the back of the display unit to disconnect it from the
power supply.
6. Making sure they are level, place two anchors 10 inches (25.4 cm) apart on the wall
where the clock is to be mounted. Use the appropriate anchors for the wall.
7. Screw two #8 screws into the wall anchors.
8. If needed, place two wall anchors 5 inches (12.7 cm) below the first two screws, to
accommodate the other two mounting screws.
9. Hang the power supply onto the top two screws using the keyholes on the back.
10. Screw two more #8 screws through the two holes at the bottom of the power supply
into the wall anchors.
12. Reconnect the ribbon cable.
13. Replace the display unit using the two screws removed in step 2.
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Semi-Flush Mounting
The power supply portion of the master clock can be recessed into the wall, so that
the display unit is semi-flush with the wall. This should only be done by a qualified
technician.
To mount the master clock semi-flush:
1. Place the master clock on its back with the display unit facing up and the key pad to
the right.
2. Remove the two screws at the top of the display unit mounting plate.
3. Lift the display unit up and away from the backbox. Two rivets at the bottom of the
cover will prevent you from lifting it straight up.
4. Unplug the ribbon cable from the back of the display unit to disconnect the power
supply.
5. Set the display unit aside.
6. Prepare the clock’s position in the wall:
The power supply backbox measures 12 inches (30.5 cm) wide by 6 inches (15.2 cm)
high by 3-3/8 inches (8.6 cm) deep.
The wall mount cover measures 13 inches (33 cm) wide by 7 inches (17.8 cm) high
by 1-1/4 inch (3.2 cm) deep, and extends ½ inch (1.8 cm) around the backbox.
Cut a 12-1/4 inch (31.1 cm) by 6-1/4 inch (15.9 cm) hole in the wall between two
studs where you want to hang the master clock.
7. Cut two blocks of wood for filler and attach them to the studs.
8. Screw the power supply box to the blocks using the two holes on each side of the box.
10. Reconnect the ribbon cable.
11. Replace the display unit using the two screws removed in step 2.
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Using the Installer’s Hooks to Hang the Display Below the Backbox
When mounting the clock in either semi-flush or surface installations, the hooks on the
back of the display unit mounting plate can be used to hang the display unit below the
To use the hooks:
1. Remove the two screws securing the display unit to the backbox.
2. Lift the unit up and away from the backbox, leaving the ribbon cable attached. Two
rivets at the bottom of the cover will prevent you from lifting it straight up.
3. If you have a semi-flush installation, remove the green communications connector
plug from the back of the display unit. This allows the unit to sit flat against the wall.
4. Swing up the two hooks on the back of the unit and hook them over the bottom edge
of the backbox. You now have access to the key pad for making program changes or
manually activating the circuits, and access to the relay and connector blocks inside
the backbox.
Figure 1-2
Hook Mounting the Display Unit
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Rack Mounting
The two L-shaped brackets and the box cover supplied with the master clock can be used
To rack mount the clock:
1. Place the master clock on its back with the display unit facing up and the key pad to
the right.
2. Remove the two screws securing the display unit to the backbox.
3. Lift the display unit up and away from the backbox. Two rivets at the bottom of the
cover will prevent you from lifting it straight up.
4. Unplug the ribbon cable from the back of the display unit to disconnect the power
supply.
5. Detach the display unit from the wall mount plate by removing the four screws on the
back of the display unit. (IMPORTANT: Do not lose these screws. They are a specific
length so they do not interfere with the circuit board inside the display unit. Using any
other screws to attach the display unit to the case will void any warranty.)
on page 1-7.
7. Using the four screws removed in step 5, attach the display unit to the bottom of the
power supply. To assist you, there are holes opposite the four screw holes where you
can fit a #1 Philips screwdriver with an 8-inch (20.3 cm) blade.
8. Reconnect the ribbon cable from the power supply to the display unit.
9. Remove the two screws from one side of the display unit, then use them to attach an
other bracket to the other side.
10. Mount the unit in the rack.
11. Wire the clock before attaching the box cover. See Wiring the Master Clock on
page 1-8.
12. Attach the cover to the power supply using four 6-32 screws. Two of these screws
were removed from the display unit in step 2. The other two were supplied with the
clock.
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Wiring the Master Clock
This section provides instructions on wiring the power source, secondary clocks, and sig-
naling devices to the master clock. It does not cover the connection of the optional
modem, a computer, any RS-485 devices, and a power source for the optional remove
schedule selector. Instructions for those devices are provided in Appendix C.
Stranded wire is recommended for use inside the power
supply box, as it allows a firm connection to the quick
connect terminals. There is also less chance of stranded
wires interfering with the components on the relay board.
If solid wire must be used, join the stranded wire to the
solid wire in another box.
The master clock is supplied with quick connects. These
should be attached to the wires as necessary so that the
wiring can be connected to the terminal blocks as shown
Figure 1-4
Plugging Quick Connects
into the Terminal Block
—WARNING—
Failure to properly connect the ground wire
can increase interference and cause
unsafe operating conditions.
Wiring Procedure
power supply backbox. Follow the steps below the figure to wire the clocks, power
source, and signaling devices to the master clock.
Notes:
• Circuits CKT1 through CKT4 designate bell controls. Circuit pairs CKT5/CKT6
and CKT7/CKT8 can function as clock synchronization circuits or as bell controls.
• MOVs (Metal-Oxide Varistors) protect all relay contacts.
• Voltage-select jumpers connect to terminal block P4 for 120Vac operation. For
clocks that must run at 220/240Vac, remove the 120V jumpers and install one
jumper wire for the 240V selection. The system will automatically adjust for oper-
• Some clock setups may require external diodes or MOVs. See the wiring diagram
for your type clock (see Appendix B).
1-8
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Figure 1-5
Master Clock Terminal Blocks
Note:
The master clock is shipped set up for 120Vac operation. To wire it for 220/240Vac,
—WARNING—
DO NOT turn on AC power, and keep the
power/relay unit’s toggle switch OFF until you
complete the rest of the wiring in this section.
—WARNING—
Applying 220/240Vac power to a system not
set up for that voltage level can severely
damage the electronic parts.
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2. Wire the secondary clocks to P1 and/or to P2. See Wiring Secondary Clocks on
Note:
You may need to add external metal-oxide varistors (MOVs) or diodes to synchronize
a specific clock type. See the clock wiring diagrams in Appendix B.
Note:
If the master clock is not connected to any secondary clocks, signaling devices can be
wired to P1 and P2.
4. Although the master clock is fused internally to protect its electronics, the incoming
AC line must also be fused as required by your local electrical code. Dukane recom-
mends connecting the unit to a dedicated 10-amp circuit.
5. Turn the toggle switch in the power supply to the ON position.
6. Complete any mounting steps in the previous section, Mounting the Master Clock
on page 1-2.
Synchronizing Non-Compatible Clocks by External Pulse
The master clock can synchronize to other systems if necessary. For example, you have a
non-compatible time clock that cannot be synchronized by the master clock, but it has a
built-in bell ringer. By shorting terminals 7 and 8 on terminal block P4, or terminals 6
and 7 of the communications terminal on the back of the display unit, the master clock
will immediately reset to 00:00 (midnight). If you can program the other device to close
its circuit at 00:00 (midnight) then the two systems will remain reasonably in sync.
—WARNING—
DO NOT apply power to the external
pulse-sync terminals. Simply close
the circuit for 1–5 seconds.
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Section
Configuration
2
Setting Up the Master Clock
Once the master clock is installed, it is ready for programming. This chapter covers the
programming instructions needed to set the master clock for operations.
Note:
To completely clear the clock of all settings and reset the master clock to its factory-
shipped configuration, press the following number sequence on the master clock key
pad: 355379768274. This clears all programmed schedules and reinitializes the
master clock.
Programming Relays
If the master clock will control one type of secondary clock, relays #7 and #8 on terminal
block P1 are used for this purpose. If the master clock will control a second clock type,
Bell
Bell
Bell
Bell
Bell
Bell
Bell
Bell
Zone #1 Zone #2 Zone #3 Zone #4 Zone #5 Zone #6 Zone #7 Zone #8
Relay
#1
Relay
2#
Relay
#3
Relay
#4
Relay
#5
Relay
#6
Relay
#7
Relay
#8
Clock Sync #2
Clock Sync #1
Table 2-1
Relay Usage
Here are some possible ways to program the master clock relays:
• Eight bell zones that can last from 1 to 99 seconds. Use this setup if the master clock
will not be used to synchronize secondary clocks. (Note: The maximum closure time
provided by this master clock is 99 seconds. Closures longer than 99 seconds will re-
quire an external latching relay. This is not provided by Dukane.)
• Six bell zones and one wall clock synchronization control. Use this setup if the master
clock will only synchronize one type of clock in one string.
• Four bell zones and two wall clock synchronization controls. Use this setup if the mas-
ter clock will synchronize two clock types, or if there are two strings of clocks
(typically 20 to 35 clocks to a string).
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Programming Functions
This section explains how to put the master clock in program mode and configure the
necessary functions to get the master clock running. For definitions of all functions, key
pad commands, and the bell test, see Section 3—Function List.
The master clock is normally in clock mode, displaying the date and time. To access pro-
gram mode, press [#] on the key pad. Pressing [*] stops programming so you can re-enter
a setting or quit.
Entering the Password
The administrative password provides access to both advanced functions and user functions.
The user password only provides access to user functions.
User passwords are explained further in the Master Clock User Guide, document
427-07-00047.
The factory-programmed administrative password is 332537, or DEALER (as spelled out
on a telephone key pad). It cannot be changed.
Note:
To keep the administrative functions secure, only give this guide to authorized personnel.
The following shows the key sequence to enter the password, and the resulting clock
display:
Administrative Password:
User Password:
Press
Display
Press
Display
[#]
SELECT FUNCTION CODE
[0] = ENTER PASSWORD
PASSWORD: 000000
PASSWORD: 332537
ADMINISTRATOR
[#]
SELECT FUNCTION CODE
[0] = ENTER PASSWORD
PASSWORD: 000000
PASSWORD: NNNNNN
PASSWORD ACCEPTED
[0]
[0]
[#]
[#]
[3][3][2][5][3][7]
[#]
[user password]
[#]
PASSWORD ACCEPTED
The display returns to clock mode (the time and date) after a few seconds.
Notes:
A password expires after approximately five minutes. If the master clock starts block-
ing access to programming functions, re-enter the password.
2-2
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Setting the Date and Time
Use the [1]=SET DATE / TIME function to set the date and time.
Enter the user password as shown on page 2-2, then follow the key sequences below:
Press
[#]
Display
SELECT FUNCTION CODE
[1]=SET DATE / TIME
[1]
[#]
ENT. DATE: MM-DD-YYYY
Enter the numbers for the month, date, and year (four-digit year)
[0]...[8]
[#]
ENTER DAY-OF-WEEK: D
1=SUNDAY...7=SATURDAY
[1]...[7]
Enter a number [1]–[7] for the day of the week, Sunday through
Saturday
TODAY IS (selected day)
ENTER TIME: HH:MM
[#]
[0]...[8]
Enter the time of the next upcoming minute, using either 12-hour of
24-hour format. If using 24-hour format, enter midnight as 00:00.
[#]
SELECT [0]PM / [1]AM
You will only see this if you enter a time less than 13:00 (1:00 PM).
[0] or [1]
[#]
PRESS [#] IF CORRECT
Clock returns to time display.
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Enabling the Relays
Use the [6]=ENABLE CIRCUITS function to enable or disable the master clock’s con-
trol relays during circuit wiring or maintenance. This function can also hold back clocks
to manually adjust for daylight saving time in the fall if the daylight saving function is
function only enables the relays; it does not turn them on. See Manually Activating Bell
Enter the administrative password as shown on page 2-2, then follow the key sequences
below:
Press
[#]
Display
SELECT FUNCTION CODE
[6]=ENABLE CIRCUITS
[6]
[#]
SELECT ACTIVE
BELL ZONES 12345678
CLOCK CKTS
PRESS [#] IF CORRECT
[1]...[8]
[#]
Enter the circuit numbers that you want to enable or disable by
toggling the numbers; when you see all the circuits you want
enabled on the display, press [#].
PRESS [#] TO CONFIRM
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Choosing the Clock Types to Synchronize
To select a clock type for the master clock to synchronize, use the [2]=SELECT CLOCK
CTL function. This allows you to match the master clock to the type of secondary clocks
installed. This function configures both clock #1 (relays 7 and 8) and clock #2 (relays 5
and 6), if present.
Notes:
To check the current master clock configuration, use the quick command [*] while the
clock is in clock mode. The CLK1 and CLK2 clock type code numbers appear in the
fourth line of the display. (See Appendix B for a list of the clock codes.)
If the master clock will synchronize Dukane digital clocks, verify that relay 7 has
been replaced with the solid-state relays available in the Dukane kit #438-860. Then
assign code 07 to CLK1.
Enter the administrative password as shown on page 2-2, then follow the key sequences
below:
Press
[#]
Display
SELECT FUNCTION CODE
[2]=SELECT CLOCK CTL
[2]
[#]
ENABLE CLOCK CIRCUIT
SELECT CLK1 CODE: NN
[#] FOR CODE LIST
Refer to Appendix B, or press [#] repeatedly to scroll the code list.
[0]...[9]
[#]
Enter the two-digit code for CLK1, then press [#]. If you will not use
a CLK1, enter 00.
CLK TYPE CODE: NN
If you chose a CLK1 type other than 00, you will see:
SELECT CLK2 CODE: NN
[0]...[9]
[#]
Enter the code for CLK2, or 00 if you will not use a CLK2.
PRESS [#] IF CORRECT
[#]
Press [#] to accept, or [*] to cancel and try again.
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Manually Activating Bell Controls
Use the [3]=MANUAL BELL CTRL function to test the bell circuits.
This function does not require a password. Follow the key sequences below:
Press
[#]
Display
SELECT FUNCTION CODE
[3]=MANUAL BELL CTRL
[3]
[#]
MANUAL BELL CONTROLS
1-2-3-4-5-6-7-8
PRESS AND HOLD [#]
TO EXECUTE. [*] TO END
[1]...[8]
Enter the circuit numbers to be tested, then press and hold [#]. Those
circuits will turn on their relays, as shown by the green panel lights,
and the bells connected to the activated circuits will sound. When you
release the [#], the circuits will turn off their relays. Either choose and
test other circuits, or press [*] to quit.
Note:
Only circuits configured as bell zones will appear. Circuits 5–8 will
not appear if the master clock has been programmed to use these
relays for control of secondary clocks.
[*]
Return to time and date display (clock mode).
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Testing the Bells
Use the AUTO BELL TEST function to turn on all bell relays once per minute at the start
of each minute. This tests the continuity of the bell wiring circuits. This function does not
require a password.
1. If you have entered a password within the last several minutes, deactivate it by fol-
toggle the clock between 12- and 24-hour format during this procedure.
2. Use the [6]=ENABLE CIRCUITS function to disable any relays that you do not want
3. While the clock is displaying the time, press [2][3][5][5][8][7][8] to start the bell test.
While entering this code, ignore anything that displays on the screen.
Note:
After you enter the test command, there may be a delay before the bells sound.
4. When done, re-enter [2][3][5][5][8][7][8] to stop the test.
5. Use the [6]=ENABLE CIRCUITS function to re-enable any relays disabled in step 2.
Setting Daylight Saving Time
If your region observes daylight saving time, use the [7]=DAYLIGHT SAVINGS func-
tion to enter the country code so the master clock will automatically adjust for daylight
saving time. The factory-programmed country code is 08 (United States). See Appendix
A for a list of country codes.
Notes:
If your nation does not appear in the country code list, or if the dates for daylight sav-
ing in your country have changed, choose code 00 and use the optional Lathem
MasterLink software to program clock adjustments. If your region does not observe
daylight saving time, choose code 00.
Press
[#]
Display
SELECT FUNCTION CODE
[7]=DAYLIGHT SAVINGS
[7]
[#]
ENTER COUNTRY CODE
FOR DAYLIGHT SAVINGS
TIME ADJUSTMENT:
08 (default)
[0]...[9]
[#]
Enter the country code (see Appendix A).
Press [#] to accept or [*] to cancel.
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Setting Communications
The [B]=COMMUNICATIONS function is used to enter data transmission speed and a
terminal ID number. Use this function if the clock will be programmed to call the NIST atomic
clock, or if you are using the optional Lathem MasterLink software to program the master clock.
The clock can be set up using RS-232 (serial), RS-485 (networked), or modem (remote) com-
munications. You must enter the same settings for the Model 24A715M in the programming
software.
You can view the current terminal ID# and baud rate by using the quick command [*]
when the master clock is in clock mode.
Enter the administrative password as shown on page 2-2, then follow the key sequences
below:
Press
[#]
Display
SELECT FUNCTION CODE
[9]=SYNCH. CLOCKS
[B]=COMMUNICATIONS
[9]
[0][0]
[#]
COMMUNICATIONS SETUP
SELECT BAUD RATE:
[2]400 -OR- [9]600
[2] or [9]
Press [2] for 2,400 baud or [9] for 9,600 baud (9,600 is the default)
Note: If the clock will be programmed to call the NIST atomic clock,
you must select 9,600 baud.
9600 (or 2400) BAUD SELECTED
ENTER TERM ID# NNN
[0]...[9]
[#]
Enter a unique terminal ID# from 00–127 (065 is the default)
PRESS [#] TO CONFIRM
[#]
Press [#] to accept or [*] to cancel and try again.
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Securing the Setup
At this point you have finished the basic setup of the master clock and it should be up and
running. The clock can now be programmed with user-specific settings such as bell
schedules and holidays. For detailed information, see the Master Clock User Guide, doc-
ument 427-07-00047.
The master clock automatically exits from program mode if you stop using the key pad
for five minutes. To exit programming mode immediately and prevent others from ac-
cessing the master clock, simply enter an invalid password. For example:
Press
[#]
Display
SELECT FUNCTION CODE
[0]=ENTER PASSWORD
[0]
[#]
PASSWORD: 000000
INVALID PASSWORD
[9][9][#]
[*]
Returns clock to time display.
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Notes
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Section
Function List
3
Introduction
This chapter list all functions accessible through the master clock key pad. For detailed
instructions on these functions, see Section 2—Configuration and the Master Clock
User Guide, document 427-07-00047.
Quick Commands
Quick commands are used to display system information for about two seconds. You can
press the quick keys, [*], [1], or [3], when the master is displaying the time and date.
[*] READ STATUS
Any time the master clock is in clock mode (displaying time and date), press [*] to see
02-13-01 VER. 1.06
ID# 065 | BAUD 9600
TIME 12HR | DST 08
CLK1 01 | CLK2 00
Figure 3-1
Status Display
Display
Date
Description
Displays current programmed date
Terminal ID#
ID# xxx
TIME
Shows if display is in 12- or 24-hour format
Clock types this master clock will synchronize
Firmware version
CLK1 | CLK2
VER. x.xx
BAUD
Baud rate for network communications
Daylight saving time country code
DST
Table 3-1
READ STATUS Definitions
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[1] VIEW EDIT KEYS
Any time the master clock is in clock mode (displaying time and date), press [1] to see
programming bell schedules, automatic schedule change dates, and holiday dates. Quick
command [1] only displays a listing of the edit keys for reference; you cannot make a se-
lection from this display.
EDITING COMMANDS
[1]EDIT [*]ABORT/EXIT
[3]PRV [#]NXT/ENTER
[6]ADD [4]DEL [9]1ST
Figure 3-2
Edit Keys Display
Display
[1] EDIT
Description
Edit the displayed record
[3] PRV
Show the previous record
Add a new record
[6] ADD
[*] ABORT/EXIT
[#] NXT/ENTER
[4] DEL
End and exit
Show the next record
Delete the displayed record
Show the first record (in ascending order)
[9] 1ST
Table 3-2
List of Edit Keys
[3] 12/24 HOUR TOGGLE
Any time the master clock is in clock mode (displaying time and date), enter the user
password, then press [3] to toggle the time between 12-hour and 24-hour format. The up-
per right corner displays AM or PM for 12-hour format, or the day of the week for
24-hour format (for example, WE for Wednesday or HO for Holiday).
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Programming Commands
To access the master clock’s programming functions, press [#] to enter program mode.
When SELECT FUNCTION CODE appears on the display, the clock is ready for
programming. The master clock will automatically exit out of program mode if you have
not made a key pad entry for five minutes.
[0]=PASSWORD
A password is required for most programming functions. To enter either the administra-
tive or user password, press [#][0][#], followed by the six-digit password, then press [#].
You can now program the master clock until the password expires. A password expires
after approximately five minutes. If the master clock starts blocking access to program-
ming functions, re-enter the password.
The administrative password 332537 [DEALER] enables you to access both user and ad-
vanced functions.
The default user password 000000 is used to access user functions. Use the
[C]=CHANGE PASSWORD function to change your user password (see page 3-6). You
cannot change the administrative password.
[1]=SET DATE / TIME
[2]=SELECT CLOCK CTL
This function requires the administrative password. Use this function to choose the clock
types that the master clock will synchronize.
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[3]=MANUAL BELL CTRL
This function does not require a password. Use this function to test bell circuits or to
manually ring a bell at an unscheduled time.
[4]=PROGRAM SCHEDULE
Use this function to set bell schedules. Bell schedules are defined as the days and times
when the bell circuits will turn on.
Enter the password, then press [#][4][#]. See the Master Clock User Guide, document
427-07-00047, for complete instructions.
[5]=SCHEDULE CHANGES
Use this function to activate schedules on a specific start date and time. Use this function
if you wish to activate schedules at future dates. You can program up to 16 changes at a
time.
Enter the password, then press [#][5][#]. See the Master Clock User Guide, document
427-07-00047, for complete instructions.
[6]=ENABLE CIRCUITS
This function requires the administrative password. Use this function to enable and dis-
able bell relays during circuit wiring or maintenance. This function can also hold back
clocks to manually adjust for daylight saving time in the fall if you do not use the
[7]=DAYLIGHT SAVINGS function.
Note:
Disabled relays will ignore any schedules, and you cannot manually turn them on.
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[7]=DAYLIGHT SAVINGS
This function requires the administrative password. Programming the master clock with
the appropriate two-digit country code enables it to automatically adjust for daylight sav-
ing time.
See Appendix A for the country code list, and see Setting Daylight Saving Time on
page 2-7.
[8]=CHANGE SCHEDULES
Use this function to override any active bell schedules that were set up using the
[5]=SCHEDULE CHANGES function, or to immediately run a schedule set up using the
[4]=PROGRAM SCHEDULE function.
Enter the password, then press [#][8][#]. See the Master Clock User Guide, document
427-07-00047, for complete instructions.
[9]=SYNCH. CLOCKS
Use this function to immediately synchronize any secondary clocks. This function is pri-
marily used during initial installation, or if power to the secondary clocks is interrupted.
Enter the password, then press [#][9][#]. See the Master Clock User Guide, document
427-07-00047, for complete instructions.
[A]=PROGRAM HOLIDAYS
The master clock can be programmed with up to 16 holidays. During holidays, only the
events that are set to occur on holidays will turn on when they reach the scheduled time.
Enter the password, then press [#][9][0][#]. See the Master Clock User Guide, document
427-07-00047, for complete instructions.
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[B]=COMMUNICATIONS
This function requires the administrative password. Use this function to set the master
clock’s terminal ID# and baud rate.
[C]=CHANGE PASSWORD
Use this function to change the default user password (000000) to another six-digit num-
ber to prevent unauthorized access to the master clock’s programming functions. Keep a
copy of this password in a safe place.
Enter the current user password, then press [#][9][0][0][0][#]. See the Master Clock User
Guide, document 427-07-00047, for complete instructions.
AUTO BELL TEST
No password is required for this function. Use the AUTO BELL TEST function to turn
on all bell relays once per minute at the start of each minute when you need to test the
continuity of the bell wiring circuits.
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Appendix
Daylight Saving Country Codes
A
DAYLIGHT SAVING COUNTRY CODES
ALBANIA
02
02
02
02
02
02
08
02
02
02
08
02
13
02
08
01
12
02
06
02
02
02
02
09
ENGLAND
ESTONIA
01 MALTA
02
02
02
11
02
02
02
02
02
02
02
02
02
02
02
02
03
02
02
02
08
02
02
00
ANDORRA
ARMENIA
02
MONACO
FALKLAND ISLANDS
FINLAND
10
02
02
02
02
02
07
07
02
02
03
02
04
02
08
05
02
02
02
02
02
02
NETHERLANDS
NEW ZEALAND
NORWAY
AUSTRIA
AZERBJAN
AZORES
FRANCE
GERMANY
GIBRALTER
GREECE
POLAND
BAHAMAS
BALEARIC ISLANDS
BELARUS
PORTUGAL
ROMANIA
GREENLAND
HAITI
RUSSIA
BELGIUM
SAN MARINO
SCOTLAND
SLOVAKIA
BERMUDA
BOSNIA/HERZEGOVINA
BRAZIL
HUNGARY
IRAN
IRAQ
SLOVENIA
BULGARIA
CANADA
IRELAND
SPAIN
ISRAEL
SWEDEN
CHANNEL ISLANDS
CHILE
ITALY
SWITZERLAND
SYRIA
JAMAICA
JORDAN
CROATIA
TURKEY
CUBA
KAZAKHSTAN
KYRGYZSTAN
LATVIA
UKRAINE
CYPRUS
UNITED KINGDOM
UNITED STATES
VATICAN CITY
YUGOSLAVIA FED.
USER-SPEC. DATES
CZECH REP
DENMARK
EASTER ISLAND
EGYPT
LEBANON
LIECHTENSTEIN
LUXEMBURG
continued
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DAYLIGHT SAVING TIME CODES AND DURATION
Code Start and end date
Code Start and end date
01
02
Last Sunday in March, 3rd Sunday in October 08
First Sunday in April, last Sunday in October
Last Sunday in March, last Sunday in
September
09
First day of May, last day of September
03
First day of April, last day of September
10
Second Sunday in September, 2rd Sunday in
March
04
05
First Friday in April, 1st Sunday in September 11
First Friday in April, 3rd Friday in September 12
First Sunday in October, 3rd Sunday in March
Second Sunday in October, 2nd Saturday in
February
06
07
First Sunday in April, 1st Saturday in October 13
First Sunday in April, last Sunday in October
Third Sunday in October, 2nd Sunday in
February
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Appendix
Secondary Clock Types
B
SECONDARY CLOCK TYPE CODES
Type Description
Type Description
Synchronous Wired
01
01
01
01
01
01
01
01
01
01
01
01
02
02
02
02
02
02
02
02
02
02
02
02
02
02
03
04
05
06
06
06
06
07
07
07
08
09
10
11
12
13
14
15
16
17
18
18
18
19
19
20
21
22
23
23
24
27
28
29
30
Faraday
Lathem Type SS
Honeywell ST402A
Cincinnati D10
Dukane 24F200 Digital (Obsolete)
Dukane 24F750, 24F750A (Obsolete)
Dukane 24D20, 24D20A, 24D40
Rauland 2410 Digital
Dukane 24SS Series
IBM 77 Series
Simplex 77 Series
Simplex 93-9
Simplex Dual Motor/59
Simplex Dual Motor/45
Edwards Dual Motor
Simplex 91-9
Simplex 941-9
Simplex 943-9
Cincinnati D6
Standard Electric D10, D12
Stromberg 3000
Two-Wire Pulse Alternating
Electronic Coded
Three-Wire Minute Impulse/59
Lathem ISC Two- and Three-Wire
Cincinnati D2-D4
Dukane 24ISC Series
Edwards Impulse
Straight Frequency
Impulse with 12-Hour Correction/59
Standard Electric Time AR2/3
National Synchronous Wired
Dukane 240 Series (Obsolete)
Rauland 2463 Series (Analog)
Stromberg Synchronous Wired/56
Lathem SS Modified
Faraday Impulse
IBM 75 Series
Simplex 75 Series
Simplex 91-4
Three-Wire Minute Impulse/44
Cincinnati D1
Simplex 93-4
Simplex 941-4
Dukane Synchronous Wired
Condor 2412 Digital
Simplex 943-4
Standard Impulse
Stromberg Impulse
Standard Electric Synchronous
Standard Electric Time AR-2A
Three-Wire Minute Impulse/58
Synchronous Wired
Cincinnati D8
Rauland 2422 Digital
Edwards Synchronous Wired Clocks, Type E1
Simplex 2310 Dual Motor
Stromberg 12-Hour
Type 01 Special
Type 14 Special
Note:
Types 25 and 26 are used by manufacturer for internal testing only.
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Wiring Secondary Clocks
The next several pages contain wiring diagrams and theory of operation for the secondary
clocks. These are listed in numerical order according to type code number.
Note:
All circuits should be fused or protected by a circuit breaker (10A maximum).
The 24A715 and 24A715M master clocks are factory-equipped to operate analog clocks
on the CLK1 output (relays 7 and 8), and CLK2 output (relays 5 and 6).
—IMPORTANT—
If the master clock will operate Dukane digital clocks, the digital clocks MUST
be operated from the CLK1 output (relays 7 and 8), and relay 7 MUST be
replaced with a solid-state relay to support the digital clocks. To obtain the
required solid-state relay, order Model 438-860 from Dukane.
TYPE 01—Synchronous Wired
For a list of Type 01 clocks, see the chart on the first page of this appendix.
In normal operation, the synchronous secondary clocks are operated from 24Vac or
120Vac, using the 60Hz power source to maintain clock accuracy. An error in the time
displayed by the secondary clock can be introduced by a power failure. The master clock
will correct the time displayed on the secondary clock using two synchronization meth-
ods: minute hand correction and absolute correction.
Minute hand correction takes place once every hour, even if there is no error in the dis-
played time. The master clock sends an eight-second pulse to the secondary clock’s
correction circuit, starting at the 57th minute and 54th second, and lasting until the 58th
minute and 2nd second of every hour. This causes the secondary clock to advance its
hands until the minute hand is correct. The hour hand will still be in error at the end of
this cycle if the error at the beginning of the cycle was in excess of one hour.
If the secondary clocks are more than one hour off, the master clock initiates an absolute
correction by sending a six-second pulse, beginning at 5:58:02 (both AM and PM) and
ending at 5:58:08. This correction cycle takes a long time to completely update the sec-
ondary clocks. Depending on how far off the secondary clocks are, the correction cycle
can take many hours to complete. The correction cycle does not run continuously, so it
may be difficult to establish whether or not the secondary clocks have completed their
correction activities.
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Please note that the relay contacts used in the CLK2 circuit are rated at 10 amps. The
combined load of the correction circuit and the run circuit should not exceed 8 amps. In
general, 20–35 analog clocks can be operated on a single string. This number depends on
the clock style and the distances involved. To estimate clock loads for Dukane 24SS se-
ries clocks, see the Dukane Analog Clock Installation Guide (document number
402-455).
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
CLK1 OR CLK2
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
CORRECTION CIRCUIT
TO CORRECTION COIL
10 ASB MAX.
1
24 OR 120 VAC
NEUTRAL
RUN CIRCUIT TO
ANALOG CLOCK MOTOR
1
NEUTRAL
Figure B-1
Three-Wire Synchronous (59th Minute, Dukane 24SS)
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TYPE 02—Three-Wire Minute Impulse (59th Minute)
There are two types of Type 02 secondary clocks: the three-wire minute impulse covered on
this page, and the two-wire reverse polarity minute impulse on the following page.
Note:
For a list of Type 02 clocks, see the chart on the first page of this appendix.
From the 58th second to 00 seconds each minute, a 24Vdc pulse is transmitted to the sec-
ondary clocks. From the 59th minute through the 49th minute, the pulse is transmitted on
both the A and B lines. From the 50th minute to the 59th minute, the pulse is transmitted
on the A line only.
Clocks that reach the 59th minute ahead of the master clock stop, since at this time they
respond only to the pulses transmitted on the B line. During the 59th minute, from 10 sec-
onds through the 50th second, 20 rapid pulses are transmitted at 0.5Hz on the A line to
advance all slow clocks.
An accumulator, designed in the software, counts the number of minutes lost due to
power failure. Upon resumption of power, the master clock transmits pulses on lines A
and B to immediately advance the slow clocks to the proper time. Resetting the time after
a power failure terminates these correction signals.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (1 second ON and 1 second OFF at 0.5Hz). The first five pulses are transmitted
on lines A and B. The remainder of the pulses are transmitted on line A only. Normal
minute pulses are inhibited during these pulses.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
B
10 ASB MAX.
2
+
A
24Vdc
–
2
C
Figure B-2
Three-Wire Minute Impulse (59th Minute)
B-4
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TYPE 02—Two-Wire Reverse Polarity Minute Impulse (59th Minute)
There are two kinds of Type 02 secondary clocks: the two-wire reverse polarity minute im-
pulse covered on this page, and the three-wire minute impulse on the previous page.
Note:
For a list of Type 02 clocks, see the chart on the first page of this appendix.
Every minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the
secondary clocks. From the 59th minute through the 49th minute, the pulse is transmitted
with line AB positive with respect to PC. From the 50th minute to the 59th minute, the pulse
is transmitted with line AB negative with respect to PC. Clocks that reach the 59th min-
ute ahead of the master clock stop, since at this time they respond only to pulses
transmitted with line AB positive with respect to PC.
During the 59th minute, from 10 seconds through the 50th second, 20 rapid pulses are
transmitted at 0.5Hz to advance all slow clocks. During the rapid pulsing, line AB is neg-
the relay contacts.
An accumulator, designed in the software, counts the number of minutes lost due to
power failure. When power is restored, the master clock transmits pulses with line AB
positive with respect to PC to immediately advance the slow clocks to the proper time.
Resetting the time after a power failure terminates these correction signals.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (1 second ON and 1 second OFF at 0.5Hz). The first five pulses are transmitted
with line AB positive with respect to line PC. The remainder of the pulses are transmitted
with line AB negative with respect to line PC. Normal minute pulses are inhibited during
these pulses.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
= 1N4004 diode or equal
1
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
FIELD CONNECTIONS
AB
1
2
3
4
5
6
7
8
1
10 ASB MAX.
–
PC
24–36 Vdc
+
2
Figure B-3
Two-Wire Reverse Polarity Minute Impulse (59th Minute)
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TYPE 03—Standard Electric Synchronous
During normal operation, 120Vac is applied to the run motor. A 15-minute correction
signal on the correction motor line causes a 12-hour correction from 5:12:00 to 5:28:00.
This occurs twice daily (AM and PM). Run motor power is connected during the 12-hour
correction. A 29-second signal is applied to the correction motor line from HH:59:30 to
HH:59:59 to cause hourly corrections. During hourly corrections, power is disconnected
from the run motor line.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
CORRECTION MOTOR
1
10 ASB MAX.
120Vac
RUN MOTOR
RETURN
1
AC RTN
Figure B-4
Standard Electric Synchronous
B-6
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TYPE 04—Standard Electric Time AR-2A Two-Wire, Dual Voltage
Each minute, from 58 seconds to 00 seconds, a low-voltage pulse (24Vdc) is transmitted.
The secondary clocks receive the pulses until the 59th minute. At this time, from 50 sec-
onds to 00 seconds, a higher voltage pulse (48Vdc) is required to advance to the hour.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz), all at 24Vdc. Normal minute
pulses are inhibited during these pulses.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
24Vdc
48Vdc
RTN
10 ASB MAX.
AB
2
PC
Figure B-5
Standard Electric Time AR-2A Two-Wired, Dual Voltage
24A715/24A715M Master Clock Installation Manual
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TYPE 05—Three-Wire Minute Impulse (58th Minute)
Each minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the sec-
ondary clocks. From the 58th minute through the 48th minute, the pulse is transmitted on
both the A and B lines. From the 49th minute to the 58th minute, the pulse is transmitted
on the A line only. Clocks that reach the 58th minute ahead of the master clock stop,
since at this time they respond only to pulses transmitted on the B line. During the 58th
minute, from 10 seconds through the 50th second, 20 rapid pulses are transmitted at
0.5Hz on the A line to advance all slow clocks.
An accumulator in the master clock software counts the number of minutes lost during a
power interruption. When power is restored, the master clock transmits pulses on both
lines A and B to immediately advance the slow clocks to the correct time. Resetting the
time after a power interruption terminates these correction signals.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz). The first five pulses are trans-
mitted on lines A and B. The remainder of the pulses are transmitted on line A only.
Normal minute pulses are inhibited during these pulses.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
B
2
10 ASB MAX.
+
A
C
24Vdc
2
–
Figure B-6
Three-Wire Minute Impulse (58th Minute)
B-8
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TYPE 06—Synchronous Wired
For a list of Type 06 clocks, see the chart on the first page of this appendix.
The clock run motor receives 120Vac continuously, with 120Vac furnished to the clock
correction coil for 55 seconds each hour from HH:58:05 to HH:59:00 to cause hourly
corrections. Ten 120Vac signals are furnished to the clock correction coil (each for 95
seconds) beginning at 5:05:00, 5:07:00, 5:09:00, 5:11:00, 5:13:00, 5:15:00, 5:17:00,
5:19:00, 5:21:00 and 5:23:00 to cause the 12-hour correction. The final 12-hour signal
ends at 5:24:35 (before the 5:30 lockout).
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
CORRECTION COIL
10 ASB MAX.
1
120Vac
AC RTN
RUN MOTOR
RETURN
1
Figure B-7
Synchronous Wired
24A715/24A715M Master Clock Installation Manual
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TYPE 07—Dukane Digital Clocks
For a list of Type 07 clocks, see the chart on the first page of this appendix.
—IMPORTANT—
Dukane digital clocks MUST be connected to CLK1
(relays 7 and 8) on the master clock. Also, for the
master clock to operate Dukane Digital clocks, its
factory-installed relay K7 MUST be replaced with a
solid-state relay, part number 596-303, available
from Dukane in the Model 438-860 kit.
Notes:
Dukane Model 24D20 and 24D40 are only used with 15Vdc power when being added
to existing installations. In new installations, these two models should be used with
24Vac power.
See the 24D20 and 24D40 installation manuals (document numbers 427-11-00035
and 427-11-00036) for instructions on establishing the current capacity for the 24Vac
power supply.
During normal operation the clock signal is grounded once every minute at zero seconds
(HH:MM:00) to increment the time display. Once every 24 hours the master clock
synchronizes all clocks to 12:00:00 AM.
The master clock automatically synchronizes the clocks after a power failure or when the
master time is reset. During synchronization the clocks reset, then after 40 seconds the mas-
ter clock slowly advances the clocks to the correct time. The clocks can be manually reset
the AC power to the master clock.
B-10
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X = Normally open contact
DUKANE DIGITAL CLOCKS
24F200, 24F750, 24F750A
= To obtain the solid state relay, order Dukane Model 438-860
*
DUKANE SOLID-STATE
*
RELAY
K8
x
RELAY (596-303)
K7
x
CLK1
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
BRN (RESET)
ORN (CLK)
2.7K OHM
+
RED (+V)
+
15Vdc
–
1uf
BLK (COMMON)
Figure B-8
Wiring Dukane 24F200, 24F750, and 24F750A Digital Clocks for 15Vdc
X = Normally open contact
= To obtain the solid state relay, order Dukane Model 438-860
DUKANE DIGITAL CLOCKS
24D20, 24D40
*
DUKANE SOLID-STATE
*
RELAY
K8
x
RELAY (596-303)
K7
x
CLK1
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
BRN (RESET)
ORN (CLK)
BLK (COMMON)
BLU (24VAC)
24Vac
BLU/WHT (24VAC)
Figure B-9
Wiring Dukane 24D20 and 24D40 Digital Clocks for 24Vac
24A715/24A715M Master Clock Installation Manual
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TYPE 08—Rauland 2410 Digital Clocks (24Vac and 120Vac)
Rauland 24Vac or 120Vac digital clocks initialize to 12:01 AM when first powered up.
During normal operation, the clocks maintain time by counting the 60Hz AC line
frequency. When the line voltage drops below 120Vac, the digital clocks start rapidly
advancing at two minutes per second. After applying power to the master clock and en-
tering system selection code 08, the master initializes to 12:01 AM and applies normal
voltage to the digital clocks, causing them to set to 12:01 AM.
After initial power-up, any time change made at the master clock causes the SYS LED to
illuminate, indicating that the digital clocks are about to be corrected. At the 56th second,
the master clock removes power from the digital clocks, then at the 59th second applies
low voltage to the clocks, causing them to rapidly advance to the new time.
When the new time is reached, the master clock reapplies the normal voltage. If the digi-
tal clocks become unsynchronized with the master, they can be manually reset using the
[9]=SYNCH. CLOCKS function. See page 3-5.
When a manual clock advance is initiated, the SYS LED illuminates, power is removed at
the 56th second, and a low voltage is applied at the 59th second, causing the clocks to ad-
vance to the current master time, at which point normal voltage is reapplied.
When a daylight saving mode, either forward or back, is initiated at 2:00 AM Sunday, the
master removes power from the clocks and applies low voltage, causing the clocks to rap-
idly advance to the new time, either 1:00 AM or 3:00 AM, at which point normal voltage
is reapplied.
Every 24 hours at 12:00:56 AM, the master clock removes power from the clocks, then
reapplies power at 12:00:59 AM, causing the clocks to set to 12:01:00 AM, thereby syn-
chronizing the clocks with the master clock.
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X = Normally open contact
I = Normally closed contact
RAULAND
2410 CLOCK MODULES
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
10 ASB
MAX.
120Vac
65–85Vac
AC RTN
1
Figure B-10
Wiring Rauland 2410 Digital Clocks for 120Vac
X = Normally open contact
I = Normally closed contact
RAULAND
2410 CLOCK MODULES
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
10 ASB
MAX.
24Vac
13–17Vac
AC RTN
1
Figure B-11
Wiring Rauland 2410 Digital Clocks for 24Vac
24A715/24A715M Master Clock Installation Manual
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TYPE 09—Simplex 59th Minute, Dual Motor
Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through
HH:58:59, power is removed from the run motor and applied to the fast advance motor.
During manual clock corrections, power is applied to both motors for 4 minutes and 15
TYPE 10—Simplex 45th Minute, Dual Motor
Power is normally applied to the 1 RPM run motor. Each hour, from HH:44:05 through
HH:44:59, power is removed from the run motor and applied to the fast advance motor.
During manual clock corrections, power is applied to both motors for 4 minutes and 15
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
CODE 09 = 59TH MIN.
CODE 10 = 45TH MIN.
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
FIELD CONNECTIONS
FAST ADVANCE MOTOR
1
2
3
4
5
6
7
8
10 ASB MAX.
1
120Vac
AC RTN
1 RPM RUN MOTOR
RETURN
1
Figure B-12
Simplex 59th and 45th, Dual Motors
B-14
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TYPE 11—Edwards Dual Motor
Power is applied only through relay K6 to the run motor for normal timekeeping. During
power interruptions (while clocks are stopped) and during correction, the master clock
accumulates the number of seconds. Immediately after power is restored, both relays K6
and K5 operate. Relay K5 applies power to the 10 RPM motor for 1/10th the number of
seconds accumulated, causing the clocks to advance to the correct time. After correction,
relay K5 opens and relay K6 continues to operate.
For daylight saving, the master either automatically de-energizes relay K6 to cause the
clocks to lose one hour, or energizes K5 for approximately six minutes and 40 seconds to
advance the clocks one hour.
If the clocks lose their synchronization with the master clock, they can be manually reset
using the [9]=SYNCH. CLOCKS function. See page 3-5.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
CODE 09 = 59TH MIN.
CODE 10 = 45TH MIN.
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
FIELD CONNECTIONS
FAST ADVANCE MOTOR
1
2
3
4
5
6
7
8
10 ASB MAX.
1
120Vac
AC RTN
1 RPM RUN MOTOR
RETURN
1
Figure B-13
Edwards Dual Motor
24A715/24A715M Master Clock Installation Manual
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TYPE 12—Cincinnati D6 Clocks
Normal pulsing is sent out on lines A and C from second 58 through second 00 each
minute. From minute 59 through minute 49, line A is positive with respect to line C.
From minute 50 through minute 58, except from 4:49 through 5:55 AM and PM, line C is
positive with respect to line A.
To provide hourly corrections, 20 rapid pulses at 0.5Hz are transmitted on lines A and C,
line C being positive with respect to line A, during the 59th minute of each hour from
second 10 through second 50.
To provide twelve-hour corrections, 20 rapid pulses at 0.5Hz are transmitted from second
10 through second 54 of each minute from 5:00:10 through 5:30:54 AM and PM.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz). The first five pulses are trans-
mitted with line A positive with respect to line C. The remainder of the pulses are
transmitted with line A negative with respect to line C. Normal minute pulses are inhib-
ited during these pulses.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
= 1N4004 diode or equal
1
2
CODE 09 = 59TH MIN.
CODE 10 = 45TH MIN.
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
AB
1
10 ASB MAX.
–
PC
24–36Vdc
2
+
Figure B-14
Cincinnati D6 Clocks
B-16
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TYPE 13—Two-Wire Pulse Alternating (24Vdc)
Every minute from 59 seconds to 00 seconds, a 24Vdc signal is applied on lines A and B,
causing the clocks to advance one minute. The polarity of the pulse is alternated each
minute to cause A to be positive with respect to B one minute, then B positive with re-
spect to A the next minute, and so on.
During power interruptions, the master clock accumulates the number of minutes lost.
When power is restored, the master clock sends 30 pulses per minute to correct the
clocks. The clocks can be manually advanced 60 minutes using the master clock. A total
of 62 pulses are issued during manual advance (two normal pulses plus 60 extra advance
pulses).
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
= 1N4004 diode or equal
1
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
A
CLOCKS
1
10 ASB MAX.
+
B
24Vdc
2
–
Figure B-15
Two-Wire Pulse Alternating (24Vdc)
24A715/24A715M Master Clock Installation Manual
B-17
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TYPE 14—Electronic Coded Clocks
Clocks normally run with 120Vac power. For bells or clock correction, the generator
prestart relay (K6) first turns on for the signal generator to reach frequency. K6 turns on
at the 00 second after a programmed time or manual bell time. Then relay K5 turns on for
three seconds, from the 10th to the 13th second, to apply the generator signal (coded cup
start signal) onto the 120Vac. Bell circuits then turn on for three seconds, in the order
listed below, applying the generator signal onto the 120Vac for decoding by the coded
cups.
The bell relay contacts must connect in parallel with the normally open contacts of relay
K5. If it is not time for a clock correction signal, K6 turns off at the 59th second. At the
57th minute of each hour, K5 turns on from 57:54 to 58:02, applying the 8-second hourly
correction generator signal onto the 120Vac. At 5:57 AM and 5:57 PM (12-hr correction),
K5 turns on from 5:57:54 to 5:57:08, applying a 14-second 12-hour correction generator
signal onto the 120Vac. For daylight saving, the clocks advance to the proper time by
The time sequence of each relay operation is listed below.
Relay
From
To
From
To
K6 Generator Prestart (hourly correction)
K5 Start Signal (hourly correction)
K6 Generator Prestart (12-hour correction)
K5 Start Signal (12-hour correction)
K6 Generator Prestart (bells)
K5 Start Signal (bells)
Bell Circuit 6
HH:57:00
HH:57:00
HH:57:00
5:57:10
H:59:00
HH:58:02
HH:59:00
5:58:08
HH:57:13
HH:57:54
5:57:54
5:57:13
HH:MM:00
HH:MM:10
HH:MM:20
HH:MM:25
HH:MM:30
HH:MM:35
HH:MM:40
HH:MM:45
HH:MM:59
HH:MM:13
HH:MM:23
HH:MM:28
HH:MM:33
HH:MM:38
HH:MM:43
HH:MM:48
Bell Circuit 5
Bell Circuit 4
Bell Circuit 3
Bell Circuit 2
Bell Circuit 1
B-18
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X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
FIELD CONNECTIONS
START SIGNAL
1
2
3
4
5
6
7
8
1
10 ASB MAX.
TO
120Vac
AC RTN
GENERATOR PRESTART
GENERATOR
1
COMMON
Figure B-16
Electronic Coded Clocks
24A715/24A715M Master Clock Installation Manual
B-19
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TYPE 15—Straight Frequency
Clock correction and bell circuit operations are generated by sequentially applying vari-
ous frequencies onto the 120Vac. Each bell and clock correction circuit has its own
frequency and a receiver circuit that applies the associated bell or clock frequency
(3,510Hz normally used for clock signals). The daylight saving feature advances clocks
correctly but has no means, other than normal 12-hour correction, to correct secondary
clocks at 2:00 AM. The time sequence of applying the frequencies to the 120Vac is
shown below and is controlled by the bell and system relays in the master clock.
Relay
From
To
Bell Circuit 1
HH:MM:00
HH:MM:05
HH:MM:10
HH:MM:15
HH:MM:20
HH:MM:25
HH:57:54
5:57:54
HH:MM:05
HH:MM:10
HH:MM:15
HH:MM:20
HH:MM:25
HH:MM:30
HH:58:02
5:58:08
Bell Circuit 2
Bell Circuit 3
Bell Circuit 4
Bell Circuit 5
Bell Circuit 6
K5 (hourly correction
K5 (12-hour correction)
K6 (hourly and 12-hour corr.)
K6 (bells)
HH:57:00
HH:59:00
35th second of minute
previous to bell
30th second of
bell time
Note:
Bells must be programmed one minute ahead of desired time. Bells are inhibited dur-
ing the 58th minute and will not work during manual clock corrections either.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK 1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
10 ASB MAX.
120Vac
AC RTN
3,510 HZ SIGNAL
GENERATOR
1
1
GENERATOR
PRESTART
Figure B-17
Straight Frequency
B-20
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TYPE 16—Three-Wire Minute Impulse (59th Minute) with 12-Hour Correction
There are two types of type 16 secondary clocks: the three-wire minute impulse covered
on this page, and the two-wire reverse polarity minute impulse on the following page.
Each hour from the 59th minute through the 49th minute, a two-second pulse is transmit-
ted on both the A and B lines, starting at the 58th second and ending at 00 seconds,
causing all clocks to advance each minute. From the 50th minute to the 59th minute,
transmission is on the A line only.
Clocks that are less than 10 minutes fast stop at the 59th minute since they transfer to the
B line at this time. Every hour, starting at the 59th minute and 10 seconds, 20 rapid pulses
at 0.5Hz are transmitted on the A line. Slow clocks are advanced at this pace. Every 12
hours, from 6:02 through 6:44, 23 rapid pulses are transmitted each minute on the A line,
with transmission starting at 10 seconds after and ending at 55 seconds after. Clocks that
are more than one hour slow are rapidly advanced to the correct time.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz). The first five pulses are trans-
mitted on both lines A and B. The remainder of the pulses are transmitted on line A only.
Normal minute pulses are inhibited during these pulses.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
B
2
10 ASB MAX.
TO
CLOCKS
+
A
C
24Vdc INPUT
–
2
Figure B-18
Three-Wire Minute Impulse (59th Minute) with 12-Hour Correction
24A715/24A715M Master Clock Installation Manual
B-21
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TYPE 16—Two-Wire Reverse Polarity Minute Impulse (59th Minute) with
12-Hour Correction
There are two types of type 16 secondary clocks: the two-wire reverse polarity minute
impulse covered on this page, and the three-wire minute impulse on the previous page.
Each hour, from the 59th minute through the 49th minute, a two-second pulse is transmit-
ted between lines AB and PC (with AB positive with respect to PC), starting at the 58th
second and ending at 00 second. This causes all clocks to advance each minute. From the
50th minute to the 59th minute, transmission is such that PC is positive with respect to
AB. Clocks that are less than 10 minutes fast stop at the 59th minute, since their SR con-
tacts transfer and require a pulse with AB positive with respect to PC to advance at this
time.
Each hour, starting at the 59th minute and 10 seconds, 20 rapid pulses at 0.5Hz are trans-
mitted with line PC positive with respect to AB. Slow clocks are advanced at this pace.
Every 12 hours, from 6:02 through 6:44, 23 rapid pulses are transmitted each minute, line
PC positive with respect to line AB, with transmission starting at 10 seconds after and
ending at 55 seconds after. Clocks that are more than one hour slow are rapidly advanced
to the correct time.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz). The first five pulses are trans-
mitted with line AB negative with respect to line PC. Normal minute pulses are inhibited
during these pulses. Types of secondary clocks covered by this configuration are the
same as under three-wire on the previous page.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
= 1N4004 diode or equal
1
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
FIELD CONNECTIONS
AB
1
2
3
4
5
6
7
8
1
10 ASB MAX.
+
PC
24Vdc INPUT
2
–
Figure B-19
Two-Wire Minute Impulse (59th Minute) with 12-Hour Correction
B-22
24A715/24A715M Master Clock Installation Manual
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TYPE 17—Standard Electric Time AR-3 Three-Wire Impulse
Each minute from 58 seconds to 00 seconds, a pulse is transmitted on line. The secondary
clocks receive the pulses on line A until the 58th minute. At this time, from 50 seconds to
00 seconds, a pulse on line B is required to advance to the 59th minute.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
10 ASB MAX.
24Vdc PULSE
24Vdc
48Vdc
48Vdc PULSE
CORRECTION
TO CLOCKS
2
2
DC COMMON
CLOCK
COMMON WHT
Figure B-20
Standard Electric Time AR-3 Three-Wire Impulse
24A715/24A715M Master Clock Installation Manual
B-23
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TYPE 18—National Synchronous Wired
For a list of Type 18 clocks, see the chart on the first page of this appendix.
Relay K5 is normally operated to power the clock run motors. Each hour from HH:00:00
to HH:00:28, relay K6 is operated to power the clock correction coils for 28 seconds and
cause hourly corrections. Every 12 hours, from 6:00:00 to 6:27:27, relay K6 is again op-
erated to power the clock correction coils for 27 minutes, causing 12-hour correction.
Manual clock corrections can be issued from the master during any even-numbered
minute except 00.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
1
4
5
6
7
8
FIELD CONNECTIONS
CORRECTION COIL
10 ASB MAX.
1
RUN MOTOR
RETURN
SOURCE
POWER
1
Figure B-21
National Synchronous Wired
B-24
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TYPE 19—Stromberg Synchronous Wired (56th Minute)
For a list of Type 19 clocks, see the chart on the first page of this appendix.
This clock is normally operated by 120Vac/24Vac. Relay K5 is normally operated to sup-
ply motor power. Relay K6 activates each hour from HH:56:10 to HH:56:18, causing an
eight-second signal to be transmitted on the correction line for hourly correction. Relay
K6 activates every 12 hours, from 11:56:36 to 11:56:50, causing an additional 14-second
signal to be transmitted on the correction line for 12-hour correction. During power inter-
ruptions and automatic clock resetting, relay K5 is deactivated.
Note:
Lathem SS Modified wall clocks operate according to the above signal operation if
modified to reference the minute and second hands to HH:57:16 (versus HH:59:00)
and the hour hand to 12:00 (versus 6:00).
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
CLK1 OR CLK2
1
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
MASTER CLOCK
1
2
3
1
4
5
6
7
8
FIELD CONNECTIONS
CORRECTION COIL
10 ASB MAX.
120Vac
RUN MOTOR
RETURN
1
1
AC RTN
Figure B-22
Stromberg Synchronous Wired (56th Minute)
24A715/24A715M Master Clock Installation Manual
B-25
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TYPE 20—Three-Wire Minute Impulse (44th Minute)
Every minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the
secondary clocks. From the 44th minute through the 34th minute, the pulse is transmitted
on the A and B lines. From the 35th minute to the 44th minute, the pulse is transmitted on
the A line only. Clocks that reach the 44th minute ahead of the master clock stop, since at
this time they respond only to pulses transmitted on the B line. During the 44th minute,
from 10 seconds through the 50th second, 20 rapid pulses are transmitted at 0.5Hz on the
A line to advance all slow clocks.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz). The first five pulses are trans-
mitted on lines A and B. The remainder of the pulses are transmitted on line A only.
Normal minute pulses are inhibited during these pulses.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
B
10 ASB MAX.
+
24Vdc
–
A
2
2
C
Figure B-23
Three-Wire Minute Impulse (44th Minute)
B-26
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TYPE 21—Cincinnati D1
Every minute, from HH:MM:58 to HH:MM:00, relay K6 is activated, causing an output
on line A for two seconds. During minutes 07 through 58 only relay K6 activates, causing
the output on line A to be 24Vdc.
During minutes 59 through 06, relay K5 is also activated, together with relay K6, causing
the output on line A to be 60Vdc to advance all clocks. Clocks that reach the 59th minute
ahead of the master clock stop, since at this time they respond only to the 60Vdc pulses.
Hourly corrections occur during minute 59 from HH:59:l0 through HH:59:49. During
hourly corrections, 20 rapid pulses of 24Vdc are output on line A at 0.5Hz, causing all
slow clocks to rapidly advance. All secondary clocks at minutes 59, 00, or 0l do not re-
spond to the 24Vdc, but hold until the 60Vdc signal advances them. Manual clock
advances cause a total of 62 pulses on the A line; the first five are 60Vdc and the remain-
der are 24Vdc.
X = Normally open contact
I = Normally closed contact
= 1N4004 diode or equal
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
10 ASB MAX.
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
60Vdc
24Vdc
A
TO CLOCKS
2
COMMON
COMMON
Figure B-24
Cincinnati D1
24A715/24A715M Master Clock Installation Manual
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TYPE 22—Dukane Synchronous Wired (24A Series, Obsolete)
During normal operation, either 24Vac or 120Vac is furnished to the clock run motor
through relay K6. Power is removed from the run motor during power failures, while K6
de-energizes during fall daylight saving changes.
Each hour from HH:57:00 to HH:57:55, relay K5 energizes to furnish a 24Vdc signal
to the correction coil. This 55-second signal causes all secondary clocks to advance to
the 58th minute, thus synchronizing the seconds and minutes with the master clock.
The 12-hour correction occurs twice daily, beginning at 5:59:00. Every other minute
from 5:59:00 through 6:19:55, relay K5 energizes to furnish eleven 24Vdc signals of
55 seconds duration to the clock correction coils (5:59:00 to 5:59:55, 6:03:00 to 6:03:55,
6:19:00 to 6:19:55).
These eleven signals cause all secondary clocks up to 11 hours behind to advance to
5:58:00. Hours, minutes, and seconds are synchronized to the master clock after the next
hourly correction at 6:58:00. Clocks more than 11 hours behind prior to a 12-hour correc-
tion require two 12-hour corrections to advance to 5:58:00.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
= 1N4004 diode or equal
1
2
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
10 ASB MAX.
TO CLOCK
RUN MOTOR
24Vac/120Vac
10 ASB MAX.
1
+
TO CLOCK
CORRECTION COIL
2
24Vdc
–
Figure B-25
Dukane Synchronous Wired (24A Series, Obsolete)
B-28
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TYPE 23—Condor Digital Clocks (Model 2412)
For a list of Type 23 clocks, see the chart on the first page of this appendix.
Condor digital clocks initialize to 12:00 AM when power is first applied. During normal
operations, the clocks maintain time by counting the 60Hz AC line frequency. When the
line voltage drops to approximately two-thirds normal level, the clocks start rapidly ad-
vancing at a rate of two minutes per second. After applying power to the master clock
and entering system selection code 23, the master clock initializes to 12:00 AM.
Every twelve hours, at 11:59:56 AM and 11:59:56 PM, the master clock drops K6, re-
moving power from the clocks. At 00 seconds, K6 resumes operation, applying full
power to the clocks, which synchronizes them and corrects their displays to 12:00.
After time resets, manual clock advances, daylight saving changes, and power failures,
the master clock drops K6 at the following 56th second to disconnect power to the clocks.
At 00 seconds, K6 resumes operation, applying full power to the clocks and causing them
to display 12:00. At 02 seconds, K5 operates to furnish low voltage to the clocks, causing
them to fast advance at a rate of two minutes per second. When the new time is reached, K5
is dropped, furnishing full power to the clocks for normal operation.
If the digital clocks become unsynchronized with the master clock, they can be manually
reset using the [9]=SYNCH. CLOCKS function. See page 3-5.
X = Normally open contact
I = Normally closed contact
CONDOR
RELAY
K5 (K7)
2412 CLOCK & TRANSFORMER
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
10 ASB MAX.
24Vac
10 ASB MAX.
13–17Vac
AC RTN
Figure B-26
Condor Digital Clocks (Model 2412)
24A715/24A715M Master Clock Installation Manual
B-29
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TYPE 24—Edwards Synchronous Wired Clocks, Type E1
During normal operation, 120Vac is applied between the run motor and common lines to
operate the clocks until the 58th minute. At HH:58:00 of each hour, the 120Vac is re-
placed by 120Vdc between the correction and common lines for a period of 200ms, with
the common line being positive. This pulse initiates hourly corrections for clocks that are
less than 60 minutes slow. At 5:58:09 AM and PM, an additional 120Vdc, 200ms pulse is
transmitted to correct clocks that are 60 or more minutes slow.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
2
= Diode bridge, 200V min PIV,
avg current = # clocks x 0.115A
RELAY
K5 (K7)
RELAY
K6 (K8)
I
I
x
x
x
CLK1 OR CLK2
10 ASB MAX.
MASTER CLOCK
1
2
3
4
5
6
7
8
FIELD CONNECTIONS
WHT
COMMON
120Vac
1
BLK
RUN MOTOR
1
AC RTN
RED
CORRECTION
+
–
2
Figure B-27
Edwards Synchronous Wired Clocks, Type E1
B-30
24A715/24A715M Master Clock Installation Manual
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TYPE 27—Simplex 2310 Dual Motor
Type 27 secondary clocks have the same hourly corrections as type 09, with the addition
of 12-hour corrections as for type 03.
Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through
HH:58:59, power is removed from the run motor and applied to the fast advance motor.
During manual clock corrections, power is applied to both motors for 4 minutes and 15
seconds.
During normal operation, 120Vac is applied to the run motor. A 15-minute correction
signal on the correction motor line causes a 12-hour correction from 5:12:00 to 5:28:00.
This occurs twice daily (AM and PM). Run motor power is connected during the 12-hour
correction. A 29-second signal is applied to the correction motor line from HH:59:30 to
HH:59:59 to cause hourly corrections. During hourly corrections, power is disconnected
from the run motor line.
X = Normally open contact
I = Normally closed contact
= V250LA4 MOV or equal
1
CODE 09 = 59TH MIN.
CODE 10 = 45TH MIN.
RELAY
K5 (K7)
RELAY
K6 (K8)
x
I
I
x
x
CLK1 OR CLK2
MASTER CLOCK
FIELD CONNECTIONS
FAST ADVANCE MOTOR
1
2
3
4
5
6
7
8
10 ASB MAX.
1
120Vac
AC RTN
1 RPM RUN MOTOR
RETURN
1
Figure B-28
Simplex 2310 Dual Motor
Types 28, 29, and 30
For wiring information on Type 28 (Stromberg 12-hour), Type 29 (Type 01 Special), and
Type 30 (Type 14 Special) clocks, contact Lathem Time Corporation.
24A715/24A715M Master Clock Installation Manual
B-31
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Notes
B-32
24A715/24A715M Master Clock Installation Manual
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Appendix
Wiring Diagrams
C
Wiring Diagrams List
This appendix contains wiring information and diagrams for the installation of the Dukane 24A715/M Master Clock:
C-1 Wiring the 24A715/M for 120Vac Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
C-2 Wiring the 24A715/M for 220/240Vac Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
C-3 Typical Signal Device Wiring—Terminal Block P1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C-4 Typical Signal Device Wiring—Terminal Block P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C-5 Typical Signal Device Wiring—Terminal Block P3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C-6 The Communications Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
C-7 RS-232 Cable for Permanent Connection to the Communications Terminal Block . . . . . . . . . . . . . C-5
C-8 Synchronizing RS-485 Time Synchronization Devices Without a Buffer . . . . . . . . . . . . . . . . . . . . . C-6
C-9 Using the Master Clock as a Slave to Allow 30 Extra RS-485 Time Synchronizing Devices. . . . . . C-6
C-10 Example of Cable Strain Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
C-11 Computer Cable for Front Access Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
24A715/24A715M Master Clock Installation Manual
C-1
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Wiring the Master Clock for 120Vac or 220/240Vac
settings for 220 and 240Vac operation.
All circuits should be fused or protected by a circuit breaker (10-amp maximum).
120Vac
External Sync Input (Opt.)
AC Input
from Dry Contact
2
3
4
5
6
7
8
1
P4
J2
J1
Figure C-1
Wiring the 24A715/M for 120Vac Operation
220/240Vac
External Sync Input (Opt.)
from Dry Contact
AC Input
2
3
4
5
6
7
8
1
P4
J1
Figure C-2
Wiring the 24A715/M for 220/240Vac Operation
C-2
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Wiring Signal Devices to the Master Clock
Typically, signal devices (such as bells or lights) are wired to terminal block P3. If no
secondary clocks are connected to terminal blocks P1 or P2, signal devices can also be
wired to those blocks. See the figures below.
Zone 7A and 7B operate together, and 5A and 5B operate together. You can use either of
these circuits for bells. All circuits should be fused or protected by a circuit breaker
(10A maximum).
Voltage IN
7
8
1
2
4
3
5
6
Zone 8
Zone 7A
Zone 7B
Zone 7A & 7B Operate Together
Figure C-3
Typical Signal Device Wiring—Terminal Block P1
Voltage IN
Voltage IN
7
8
7
8
1
2
4
1
2
3
5
6
3
4
5
6
Zone 6
Zone 5A
Zone 5B
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5A & 5B Operate Together
Figure C-5
Typical Signal Device Wiring—Terminal Block P3
Figure C-4
Typical Signal Device Wiring—Terminal Block P2
24A715/24A715M Master Clock Installation Manual
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Wiring the Communications Terminal Block
It is used to connect the optional modem, a computer, any RS-485 devices, and a power
source for the optional remove schedule selector.
1
2
3
4
5
6
7
8
9
10 11 12 13
G
N
D
G
N
D
S
Y
N
C
~
D
+
D
-
TxD
RxD
D
-
D
+
D
-
~
D
+
~
12V~
AC
OUT
250ma
SYNC
SYNC
MODEM
RS-232
RS-485
OUT
RS-485
DATA SYNC
IN
PULSE
SYNC
HOST COMMUNICATIONS
Figure C-6
The Communications Terminal Block
When making connections to the communications terminal block, keep the following in
mind:
• Twisted-pair (Cat-3/Cat-5) wire connects directly to the terminal block, with up to
two wires per position.
• The pulse-sync input is the same as provided in the power supply. A one-second
(minimum) dry-contact switch closure across the terminals will cause the master
clock to reset the time to 12:00 AM of the nearest date.
• Grounds (GND) are signal grounds, not chassis grounds.
Wiring the Host Communications Terminals
The host communications terminals on the communications terminal block include:
RS-232—Three terminal block contacts for RS-232 communications with an IBM-
compatible computer running the optional Lathem MasterLink programming software.
Notes:
This terminal is typically used for a permanent connection to a computer. To make a
For a temporary computer connection, see Connecting a Computer to the Front Ac-
C-4
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Figure C-7
RS-232 Cable for Permanent Connection
to the Communications Terminal Block
RS-485—Terminal block pair for RS-485 communications with an IBM-compatible
computer running the optional Lathem MasterLink programming software and SWIFT
(RS-485 to RS-232 converter).
MODEM—Modular connector for modem use. The optional internal modem can be used
to dial out to the Atomic Clock at Fort Collins, Colorado, USA, or for a remote site using
the optional Lathem MasterLink programming software.
Wiring the DDC4R Communications Terminals
The DDC4R communications terminals on the communications terminal block include:
SYNC IN—Terminal block pair used to receive RS-485 synchronization from another
Dukane master product or radio synchronization device, or to transmit the 24A715/M
synchronization commands to up to 30 RS-485 devices, including master and wall clocks.
SYNC OUT—Terminal block pair used to buffer and repeat a received RS-485 synchro-
nization signal, or to transmit the 24A715/M synchronization commands to up to 30
additional RS-485 devices.
Notes:
When first powered on, the 24A715/M monitors the SYNC IN line to determine if
it should be a master or a slave. If it does not receive a time update for 15 minutes,
it assumes it is a master and starts transmitting the time signal on the RS-485 synchro-
nization line every minute. It will re-evaluate its master/slave status every day at the
00:00 hour.
When setting up the master/slave system, make sure you apply power to the master
first, and connect the other 24A715/M to the SYNC OUT port on that clock.
24A715/24A715M Master Clock Installation Manual
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Wiring RS-485 Time Synchronization Devices
Up to 30 RS-485 Data Synchronization Devices (DSDs) can be connected to the sync ter-
minals. Since the SYNC IN port can send as well as receive, 30 extra devices can be
connected. If more than 60 DSDs are to be connected, another master clock must be used
as a booster.
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
MASTER
CLOCK
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
1
2
3
4
5
6
7
8
9
10 11 12 13
G
N
D
G
N
D
S
Y
N
C
D
+
D
-
TxD
RxD
D
-
D
+
D
-
~
D
+
~
PORTS ARE LOCATED
ON THE BACK OF
THE DISPLAY UNIT
12V~
AC
OUT
250ma
SYNC
OUT
RS-485
DATA SYNC
SYNC
MODEM
RS-232
RS-485
IN
PULSE
SYNC
HOST COMMUNICATIONS
Figure C-8
Synchronizing RS-485 Time Synchronization Devices Without a Buffer
Using the Master Clock as a Slave
Since the SYNC IN port can send as well as receive, 30 extra devices can connect here.
If you already have a master source, connect it and its string of clocks to the SYNC IN
port for a total of up to 60 devices.
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
1
2
3
4
5
6
7
8
9
10 11 12 13
G
N
D
G
N
D
S
Y
N
C
~~
~
TxD
RxD
D
+
D
-
D
+
D
-
D
+
D
-
PORTS ARE LOCATED
ON THE BACK OF
THE DISPLAY UNIT
12V~
AC
OUT
250ma
SYNC
OUT
RS-485
DATA SYNC
SYNC
MODEM
RS-232
RS-485
IN
PULSE
SYNC
HOST COMMUNICATIONS
Figure C-9
Using the Master Clock as a Slave to Allow 30 Extra RS-485 Time Synchronizing Devices
C-6
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Wiring the 12 Volt AC Out Terminals
The 12 Volt AC Out Terminals connect to a non-regulated 12V 250mA power source and
are used with the optional remote schedule selector (available from Lathem) when in
close proximity to the master clock. Contact Lathem Time Corporation for details.
—WARNING—
This circuit is not fused separately.
Attaching devices with a higher current
load may damage the master clock.
Strain Relief for the Communications Cable
Attach the two wire tie wraps included in the installation kit to the terminal block as
shown to provide strain relief to the communications cable. Use any two empty positions.
Figure C-10
Example of Cable Strain Relief
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Connecting a Computer to the Front Access Port
A computer can be temporarily connected to the master clock via the front access port.
See the figure below to make a cable for this purpose.
Figure C-11
Computer Cable for Front Access Port
C-8
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Notes
D-2
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DUKANE CORPORATION
COMMUNICATIONS SYSTEMS DIVISION - 2900 Dukane Drive, St. Charles, Illinois 60174
© 2001. Printed in USA. All specifications subject to change without notice.
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