Liebert Switch SmartSwitchTM User Manual
POWER PROTECTION  
SmartSwitch™  
Automatic Transfer Switch  
Installation and  
Operation Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE OF CONTENTS  
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1  
1.0  
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
1.1  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
1.1.1 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
1.1.2 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
1.1.3 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
2.0  
2.1  
2.2  
2.3  
2.4  
UNPACKING AND INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Input and Output Power Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Control Wiring Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
3.0  
3.1  
3.2  
3.3  
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11  
Description of SmartSwitch Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
RS-232 Communications Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
4.0  
OPERATOR CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14  
4.1  
Bypass/Transfer Control Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
5.0  
6.0  
OPERATING GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15  
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17  
i
Download from Www.Somanuals.com. All Manuals Search And Download.  
FIGURES  
Figure 1  
Figure 2  
Figure 3  
Figure 4  
Figure 5  
Figure 6  
Typical SmartSwitch One-Line Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Typical 15 to 20 Amp SmartSwitch Rackmount Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
Typical 25 to 60 Amp SmartSwitch Underfloor / Wallmount Unit . . . . . . . . . . . . . . . . . . . . . . 8  
Typical Input and Output Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Control Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Bypass / Transfer Control Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
TABLES  
Table 1  
Table 2  
Table 3  
Table 4  
Table 5  
Table 6  
Table 7  
SmartSwitch™ Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
SmartSwitch Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
RS-232 ASCII Communication Port Customer Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Example View Status Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Example View Event Log Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Example View Settings Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
ii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
IMPORTANT SAFETY INSTRUCTIONS  
WARNING  
!
THERE ARE NO USER-SERVICEABLE PARTS INSIDE THE  
REMOVABLE ELECTRONICS MODULE. OPENING OR  
REMOVING THE COVER OF THE REMOVABLE ELECTRONICS  
MODULE MAY EXPOSE HAZARDOUS VOLTAGES, EVEN WHEN  
THE SMARTSWITCH™ IS IN BYPASS. DO NOT ATTEMPT TO  
SERVICE THIS PRODUCT YOURSELF. REFER ALL SERVICING  
TO QUALIFIED SERVICE PERSONNEL.  
NOTE  
Read the entire User’s Manual before installing and operating the  
SmartSwitch. Adhere to all operating instructions and warnings on the  
unit and in this manual.  
Liebert Corporation neither recommends nor knowingly sells this product  
for use with life support or other FDA-designated “critical” devices.  
The SmartSwitch is suitable for indoor use only. Protect unit from  
excessive moisture and install in an area free from flammable liquids,  
gases, or corrosive substances.  
The unit is designed to operate from solidly grounded AC power sources  
only. Provide input overcurrent protection in accordance with the unit  
ratings. Wire and ground the unit according to national and local  
electrical safety codes.  
CAUTION  
!
!
The unit is supplied by two power sources. Unit may be  
electrically live if either of the two input sources is ON, even  
when the electronics module is removed. To isolate the unit, turn  
OFF and lock out BOTH input power sources.  
CAUTION  
If unit is furnished with input power plugs, the ground (earth)  
leakage current must not exceed 2.75 milliamperes. Most  
information technology equipment meets this requirement if no  
more than 4 pieces of equipment are powered from this unit. Note:  
These instructions may be modified by local wiring regulations.  
CAUTION  
!
This unit complies with the limits for a Class A digital device,  
pursuant to Part 15 Subpart J of the FCC rules. These limits  
provide reasonable protection against harmful interference in a  
commercial environment. This unit generates, uses and radiates  
radio frequency energy and, if not installed and used in  
accordance with this instruction manual, may cause harmful  
interference to radio communications. Operation of this unit in a  
residential area may cause harmful interference which the user  
must correct at his own expense.  
1
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
1.0 INTRODUCTION  
The SmartSwitch™ is an automatic transfer switch designed to provide fast automatic transfers  
between two independent, synchronous AC power sources to provide continuity of AC power to  
critical equipment, such as information technology equipment, despite irregularities in either of  
the two AC input power sources. The transfer is accomplished with sense and transfer times of  
less than 6 milliseconds. The SmartSwitch is available in a 2, 3, or 4 pole configurations, with  
ampacities of 13, 15, 20, 25, 30, 50, or 60 amps, in a floor, wall, or rack mount packages. Inputs  
may be hardwired or plug connected to the two input branch circuits. Outputs may be receptacles  
or hardwired connected to the load equipment.  
The SmartSwitch consists of two modules, a fixed module containing the input and output connec-  
tions and bypass switch with a compartment that holds the plug-in and removable electronics/  
switching module. Figure 1 shows a typical one-line schematic diagram of the SmartSwitch.  
Figure 1 Typical SmartSwitch One-Line Diagram  
1.1  
Specifications  
1.1.1 General Specifications  
• Manual and Automatic Transfers.  
• Sense and Transfer Time: Less than 6 milliseconds.  
• Break-Before-Make Switching.  
• Selectable Preferred Source.  
• Selectable Auto/Manual Retransfer.  
• Retransfer Time Delay: 1 to 60 seconds adjustable.  
• In-Phase Transfer Window: 1 to 20 degrees adjustable.  
• Output Overload Transfer Inhibit: 1 to 10 times full load current adjustable.  
• Programmable Switch Self Test.  
• Convection Cooling.  
2
Introduction  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
1.1.2 Electrical Specifications  
• Nominal input voltage  
120 or 208 volts single phase 2W+G, 60 Hz  
220, 230, or 240 volts single phase 2W+G, 50 Hz  
208/120 volts single phase 3W+G, 60 Hz  
208 volts three phase, 3W+G, 60 Hz  
208/120 volts three phase, 4W+G, 60 Hz  
380, 400, or 415 volts three-phase 3W+G, 50 Hz  
380/220, 400/230, or 415/240 volts three phase 4W+G, 50 Hz  
Solidly grounded power sources  
• Branch circuit breaker rating  
15, 20, 30, or 60 amps, 60 Hz  
13, 25, or 50 amps, 50 Hz  
• Maximum continuous current  
12, 16, 24, or 48 amps, 60 Hz  
13, 25, or 50 amps, 50 Hz  
• Load power factor range: 0.5 to 1.0, leading or lagging.  
• Load crest factor: up to 3.5.  
• Source voltage distortion: up to 10% THD.  
• Overload capability: 125% of continuous current for 2 hours, 1000% for 2 cycles minimum.  
• Overcurrent Protection: External overcurrent protection provided by the supply branch cir-  
cuit breakers.  
• Short circuit withstand capability: up to 20,000 symmetrical amps, protected by internal fus-  
ing.  
• Withstands Transient Voltage Surges up to 6 kV as defined by IEEE C62.41 for Category A3.  
• Meets FCC Part 15 Class A Emission Limits.  
• ETL Listed under UL Standard 1008.  
• 50 Hz units are CE marked for compliance with the EMC and Low Voltage Directives.  
• Redundant Control Power Supplies.  
• Integral Maintenance Bypass.  
• Eight Isolated Normally Open, Form A Switch Status Contacts.  
• RS-232 Communications Port  
• Hot-Swap, Plug-In Electronics Module.  
1.1.3 Environmental Specifications  
• Storage temperature range: -40° to +60°C  
• Operating temperature range: 0° to 40°C.  
• Relative Humidity: 0 to 95% without condensation  
• Operating Altitude: up to 5000 feet (1500 meters) above sea level without derating.  
• Storage/Transport Altitude: up to 40,000 feet (12,000 meters) above sea level.  
• Audible Noise: less than 45 dBA at 5 feet (1.5 meters).  
Introduction  
3
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Table 1  
SmartSwitch™ Ratings  
No. of Conductors  
OPD*  
Enclosure  
Connector  
Designation  
Receptacle  
3743  
Voltage  
208  
Phase Neutral Gnd Poles Amps Type  
Refer to  
Figure 2  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 2  
Figure 2  
Figure 2  
Figure 3  
Figure 2  
Figure 2  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 2  
Figure 2  
Figure 3  
Figure 2  
Figure 2  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 2  
Figure 3  
Figure 2  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 3  
Figure 2  
Figure 3  
Figure 3  
IBMA  
2
3
2
3
3
3
3
1
1
1
1
1
2
2
2
2
2
3
1
1
1
2
2
2
2
2
3
3
3
3
1
1
2
2
2
3
3
3
1
3
3
—
—
—
—
—
—
—
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
3
2
3
3
3
3
1
1
1
1
1
2
2
2
2
2
3
1
1
1
2
2
2
2
2
3
3
3
3
1
1
2
2
2
3
3
3
1
3
3
20  
15  
30  
30  
60  
20  
60  
15  
15  
20  
20  
30  
15  
20  
30  
20  
30  
20  
15  
20  
30  
15  
20  
30  
20  
30  
20  
30  
20  
30  
20  
30  
20  
30  
30  
30  
30  
60  
13  
25  
50  
R
U
U
U
U
U
U
U
R
R
R
U
R
R
U
U
U
U
R
R
U
R
R
U
U
U
U
U
U
U
R
U
R
U
U
U
U
U
R
U
U
IBMB  
3744  
208  
IBMC  
3753  
208  
IBMD  
3754  
208  
IBME  
7324  
208  
420R9V  
460R9V  
515R2  
420R9V  
460R9V  
5262  
208  
208  
120  
515R4  
(2) 5262  
5362  
120  
1
520R2  
120  
1
520R4  
(2) 5362  
9308  
120  
1
530R1  
120  
1
615R2  
5662  
208  
—
—
—
1
620R2  
5462  
208  
630R1  
9330  
208  
1420R1  
1430R1  
1520R1  
L515R1  
L520R1  
L530R1  
L615R1  
L620R1  
L630R1  
L1420R1  
L1430R1  
L1520R1  
L1530R1  
L2120R1  
L2130R1  
FW120  
FW130  
FW220  
FW230  
FW230N  
FW330  
FW330N  
FW360  
FW113  
FW325N  
FW350  
8410  
120/208  
120/208  
208  
9430  
1
8420  
—
1
4710  
120  
2310  
120  
1
2610  
120  
1
4560  
208  
—
—
—
1
2320  
208  
2620  
208  
2410  
120/208  
120/208  
208  
2710  
1
2420  
—
—
1
2720  
208  
2510  
120/208  
120/208  
120  
2810  
1
None  
None  
None  
None  
None  
None  
None  
None  
None  
None  
None  
1
120  
1
208  
—
—
1
208  
208/120  
208  
—
1
208/120  
208  
—
1
230  
400/230  
400  
1
—
Consult Factory for other available connectors not shown.  
* OPD - Maximum size of Overcurrent Protection Device (fuse or circuit breaker) supplying SmartSwitch.  
4
Introduction  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
2.0 UNPACKING AND INSTALLATION  
A quality installation begins on the receiving dock.  
Upon receipt and before unpacking, inspect the shipping container for damage or mishandling. If  
carton is damaged, note on shipper’s receipt and check for concealed damage. If any damage as a  
result of shipping is observed, file a damage claim with the shipper within 24 hours and contact  
your local Liebert representative or Liebert Customer Service and Support at 1-800-543-2378 to  
inform them of the damage claim and the condition of the equipment.  
If unit is to be stored before installation, it is recommended to store the unit in a dry environment  
with temperatures in the range of 0°C to 40°C. Use original packing materials or other suitable  
means to keep the unit clean. When opening the shipping carton, use care not to puncture the car-  
ton with sharp objects.  
The unit is of a size and weight that it can be easily moved to its intended location. Refer to the  
unit dimensions shown in Figure 2 and Figure 3. Typical unit weights are less than 70 pounds  
(32 kg) for the wall or underfloor enclosure and less than 40 pounds (18 kg) for the rackmount  
enclosure.  
2.1  
Location Considerations  
The unit is designed to be installed indoors where the ambient air temperature is in the range of  
0°C and 40°C with a relative humidity of 0% to 95% non-condensing.  
The underfloor and wall mount enclosures are designed to withstand moderate amounts of mois-  
ture such as is normally available under a computer room raised floor. Do not operate the units in  
standing water.  
CAUTION:  
!
Do not locate or operate the unit in hazardous areas where there  
is conductive or explosive dust, flammable liquids or gases, or  
corrosive substances.  
Altitude - The standard units are designed for full load operation up to 5000 feet (1500 meters)  
above sea level. For higher altitude applications, contact your local Liebert Representative or  
applications engineering.  
Heat Output - The units produce minimal heat output during normal operation. The typical heat  
output, which should be included in any calculations for room heat load, is less than 260 BTU/  
Hour (80 W/Hour).  
Rackmount Installation - The rackmount enclosure is designed to fit into an EIA Standard 19  
inch rack. For rackmount installation, support the unit on a shelf, bracket, or slide. Do not secure  
only by the front mounting plate. Secure the unit into the rack using four screws through the  
front plate. See Figure 2.  
Unpacking and Installation  
5
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
2.2  
Input and Output Power Connections  
All wiring should be installed by a qualified electrician. All wiring must comply with NEC and  
applicable local codes.  
WARNING  
!
RISK OF ELECTRICAL SHOCK. HAZARDOUS VOLTAGES ARE  
PRESENT INSIDE THE SMARTSWITCH. VERIFY THAT THE ALL  
INPUT POWER SOURCES ARE DE-ENERGIZED AND LOCKED  
OUT BEFORE MAKING CONNECTIONS INSIDE THE UNIT. THE  
SMARTSWITCH IS INTENDED TO BE FED FROM TWO  
SOURCES. BE SURE ALL SOURCES OF POWER ARE DE-  
ENERGIZED AND LOCKED OUT BEFORE MAKING  
CONNECTIONS INSIDE THE UNIT.  
WARNING  
!
RISK OF UNIT DAMAGE. THE SMARTSWITCH IS INTENDED TO  
BE OPERATED FROM SOLIDLY GROUNDED POWER SOURCES.  
OPERATION FROM OTHER THAN SOLIDLY GROUNDED  
POWER SOURCES MAY CAUSE MISOPERATION OR DAMAGE  
TO THE UNIT.  
If the unit is not furnished with input power cables, then input power connections are made to  
terminal blocks located inside the unit. Refer to the unit outline drawings furnished with the unit  
or Figure 2 and Figure 3 for the location of the input power connections. Terminal blocks for  
switches rated 13 to 20 amps accept wires sizes of #14 to #10 AWG. Terminal blocks for switches  
rated 25 to 60 amps accept wire sizes of #12 to #6 AWG.  
Wire Size  
AWG  
Tightening Torque  
Lb.-in (N-m)  
#14 - #10  
20 (2.3)  
25 (2.9)  
35 (4.0)  
#8  
#6  
6
Unpacking and Installation  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Figure 2 Typical 15 to 20 Amp SmartSwitch Rackmount Unit  
17.25" (438)  
18.5"  
(469)  
0.279"x0.406" (7x10)  
0.85" (21.5)  
3.5" (88.9)  
5.20"  
(132)  
Unpacking and Installation  
7
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Figure 3 Typical 25 to 60 Amp SmartSwitch Underfloor / Wallmount Unit  
If the unit is furnished with input power cables, the input power connections are made to the  
receptacles matching the input power plugs furnished located in close proximity to the Smart-  
Switch (typically within 3 feet).  
The input power connections to the SmartSwitch must include overcurrent protection included as  
part of the supply power distribution system. The maximum supply overcurrent protection for  
each SmartSwitch input should not exceed 125% of the rated continuous current or as indicated  
on the unit label. The maximum size overcurrent protection device (fuse or circuit breaker) for the  
particular SmartSwitch used is listed in the unit ratings table (see Table 1).  
The nominal voltage and frequency of each input source must match the voltage rating indicated  
on the unit label. Failure to comply with this requirement may result in misoperation or damage  
to the unit.  
Severe input voltage distortion or large ringing transients, such as those caused by utility capaci-  
tor switching, may be interpreted by the SmartSwitch as a source failure.  
The SmartSwitch is intended to be supplied from two independent AC power sources to provide  
protection against a source failure.  
8
Unpacking and Installation  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
NOTE  
The two input sources need to be nominally of the same voltage level,  
frequency and phase rotation. To ensure virtually uninterrupted transfers  
between the two AC sources, the two input sources must be synchronized,  
typically within 5 to 15 electrical degrees. For single phase circuits, be sure  
to use the same phase from each input power source to maintain  
synchronized inputs to the SmartSwitch.  
Figure 4 shows the typical input and output power connections to the SmartSwitch. The Smart-  
Switch can accept up to 3 phase conductors, a neutral conductor and an equipment grounding con-  
ductor per input and output to match the specified supply voltage configuration. See the unit  
ratings table (Table 1) for the required number of phase and neutral conductors required for the  
particular SmartSwitch used.  
For example, for a NEMA 520R2 SmartSwitch application, one phase and neutral conductor and  
equipment grounding conductor per source are required whereas for a NEMA L1530R1 Smart-  
Switch application, three phase conductors and an equipment grounding conductor per source are  
required.  
The output power connections can be to terminal blocks located inside the SmartSwitch (as shown  
in Figure 2, Figure 3, and Figure 4) or to receptacle(s) located on the SmartSwitch.  
Figure 4 Typical Input and Output Power Connections  
Unpacking and Installation  
9
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
2.3  
Grounding  
Proper, NEC-specified equipment grounding is required for safety purposes. An insulated equip-  
ment grounding conductor is recommended to be run with each input and output power connec-  
tion. The equipment grounding conductors should be at least the minimum size conductor per  
NEC Table 250-95 based on the supply overcurrent protection device.  
If conduit or other wireway is used as the grounding means, adequate electrical continuity must  
be maintained at all conduit connections. The use of isolating bushings with a metal conduit can  
be a safety hazard and is not recommended.  
In accordance with the NEC, only one equipment grounding system may be used in a single build-  
ing. As such, both input power sources should be referenced to a common building grounding elec-  
trode system. The SmartSwitch input equipment grounding conductors should not be the only  
grounding interconnection between the two input power sources.  
The SmartSwitch switches all input phase and neutral conductors to maintain complete isolation  
of the two input power sources. A common neutral-to-ground bond for the two input sources is not  
required for proper operation but is recommended to avoid potential common mode disturbances  
when source transfers are made.  
2.4  
Control Wiring Connections  
The SmartSwitch includes relay output contacts and RS-232 communications port for remote  
indication of switch status. Figure 2 and Figure 3 show the typical locations of the control con-  
nectors. Figure 5 shows the typical control connections. Refer to 3.3 - RS-232 Communications  
Port for RS-232 communication port description.  
To facilitate connection to the relay contacts, the mating connector with short pigtails of wires is  
supplied with the SmartSwitch. Relay contact ratings are 1 amp, 125 VAC or 30 VDC maximum.  
Contacts close on the indicated switch condition. The relays are located in the removable electron-  
ics module. Contacts are not operational with the electronics module removed.  
Figure 5 Control Wiring Connections  
10  
Unpacking and Installation  
Download from Www.Somanuals.com. All Manuals Search And Download.  
     
3.0 OPERATING INSTRUCTIONS  
NOTE  
Read the entire operating instructions section before placing the  
SmartSwitch into operation.  
NOTE  
For continued protection against a source failure, periodic testing of the  
SmartSwitch is recommended. For manual testing, see the transfer control  
instructions.  
3.1  
Description of SmartSwitch Operation  
The SmartSwitch™ is an automatic transfer switch designed to provide fast automatic transfers  
between two independent, synchronous AC power sources to provide continuity of AC power to  
critical equipment, such as information technology equipment. One of the two AC inputs is desig-  
nated as the “preferred” source to which the SmartSwitch will connect the load as long as the des-  
ignated input source is within acceptable voltage limits. If the preferred source falls outside the  
acceptable limits, the SmartSwitch is designed to transfer the output load to the other “alternate”  
input source, as long as the alternate source is within acceptable voltage limits and is synchro-  
nized with the preferred source within the selected phase synchronization window. The Smart-  
Switch provides fast, break-before-make transfers to prevent interconnection of the two sources,  
even under faulted source conditions. The maximum sense and transfer times are within the tol-  
erance of the IEEE Standard 446 susceptibility curve for information technology equipment to  
allow uninterrupted load equipment operation. To prevent the transfer of a output overload or  
fault condition, the SmartSwitch automatically disables transfers to the alternate source if the  
output current exceeds preset limits.  
The SmartSwitch™ consists of two modules, a fixed module containing the input and output con-  
nections and bypass/transfer control switch, and a plug-in, removable electronics/switching mod-  
ule. The bypass/transfer control switch is located behind a keylocked, hinged access cover to  
restrict access to qualified or designated operators. The plug-in module likewise contains key-  
locked latches to prevent unauthorized removal of the module. The SmartSwitch is designed to  
allow replacement of the removable electronics/switching module without having to de-energize  
the load equipment. See the bypass, transfer control, and module replacement instructions for  
more information.  
3.2  
Status Indicators  
The SmartSwitch contains seven long-life, status indicators located on the removable electronics  
module to indicate the unit and source status. See Table 2 for a listing of the status indicators  
and their definitions. The status indicators are active as long as the removable module is in place  
and at least one of the two input sources is energized.  
Table 2  
SmartSwitch Status Indicators  
Indicator  
ON PREFERRED SOURCE The output load is connected to the preferred source.  
ON ALTERNATE SOURCE The output load is connected to the alternate source.  
PREFERRED SOURCE OK All phases of the preferred source are within voltage limits.  
Description  
ALTERNATE SOURCE OK  
TRANSFER INHIBITED  
All phases of the alternate source are within voltage limits.  
Automatic transfer is inhibited. Reasons for transfer (or retransfer) inhibit  
include both sources are not available, sources are not synchronized, or the  
output load has exceeded the preset limit.  
SUMMARY ALARM  
The SmartSwitch has detected a fault condition. If both sources are available  
and synchronized, then the alarm may indicate a SmartSwitch failure.  
ON BYPASS  
The bypass/transfer switch is in the bypass position.  
Source 1 is selected as the preferred source.  
Source 2 is selected as the preferred source.  
S1 PREFERRED*  
S2 PREFERRED*  
*These LED indicators are only provided on the rackmount units.  
Operating Instructions  
11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
3.3  
RS-232 Communications Port  
The SmartSwitch contains an RS-232 ASCII communications port for changing user settings and  
remote monitoring of unit status and alarm information. The RS-232 port connections are to a  
9-pin “D” connector located on the outside of the unit. See Figure 2 and Figure 3 for the location  
of the port and Figure 5 for the port connections.  
The default parameters of the communications port are RS-232 terminal emulator protocol using  
EIA voltage levels, ASCII Characters, Half Duplex Asynchronous Communications, 9600 Baud  
rate, 8 Data Bits, 1 Stop Bit, No Parity, No Handshaking, and <CR> Terminator.  
The port uses a query-response format. Commands are divided into two groups, inquiries and set-  
tings changes. The list of available customer commands is shown in Table 3. Only one command  
is serviced at a time. A password is required to change unit settings. The default password is “Lie-  
bert.” Inquiries include viewing unit status, viewing event history log, and viewing settings. Typi-  
cal inquiry responses are shown in Table 4, Table 5, and Table 6.  
The Event Log contains the last 175 switch events. The Settings Log contains the last 50 switch  
settings changes.  
Table 3  
RS-232 ASCII Communication Port Customer Commands  
Function Command  
Selections  
View Status  
Y<CR>  
B<CR>  
O<CR>  
View Event Log  
View Settings  
Views up to the last 175 switch events  
Set Time*  
Thh:mm:ss<CR>  
Dmm/dd/yy<CR>  
Pn<CR>  
hh = hours, mm = minutes, ss = seconds  
mm = month, dd = day, yy = year  
n = 1 to 20 degrees  
Set Date*  
Synchronization Window*  
Auto Retransfer Enable*  
Auto Retransfer Delay*  
Rx<CR>  
x = 0 for disabled, x = 1 for enabled  
n = 1 to 60 seconds  
En<CR>  
Load Current Transfer Inhibit* In<CR>  
n = 1 to 10 times full load current  
x = 0 for Manual, x = 1 for Automatic  
x = 0 for disabled, x = 1 for enabled  
Load Current Inhibit Reset*  
Auto Transfer Test Enable*  
Auto Transfer Test Settings*  
Hx<CR>  
Sx<CR>  
Xmm/dd/yy hh:mm:ss n<CR> mm/dd/yy = test date, hh:mm:ss = test time,  
n = 1 to 365 days between tests  
Restore Default Settings*  
Clear Event Log*  
W<CR>  
G<CR>  
View Settings Log  
C<CR>  
Views up to the last 50 switch settings  
changes  
Clear Settings Log*  
Z<CR>  
*User Password required for these commands. System prompts for password entry. Password remains valid for 2 minutes  
after each password-required command.  
Table 4  
Example View Status Response  
ALARMS  
Alarms include:  
Power Supply Fault  
Preferred Source Fail, Alternate Source Fail, Out  
of Sync, Transfer Inhibit, Peak Overload,  
Transfer Test Failed, and Power Supply Fault.  
SOURCE and SWITCH  
Load on Preferred Source  
Switch in Normal Mode  
Preferred Source Available  
Alternate Source Available  
Source and Switch Messages include:  
Load on Preferred Source, Load on Alternate  
Source, Switch in Normal Mode, Manual Transfer  
to S1, Manual Transfer to S2, Bypass to S1,  
Bypass to S2, Preferred Source Available, and  
Alternate Source Available.  
12  
Operating Instructions  
Download from Www.Somanuals.com. All Manuals Search And Download.  
     
Table 5  
DATE  
Example View Event Log Response  
TIME DESCRIPTION  
Logged Events include:  
10/21/97 16:34:39 Transferred to Preferred  
10/21/97 16:34:39 Transfer Test Passed  
10/21/97 16:34:39 Transferred to Alternate  
10/21/97 16:34:38 Transfer Test Initiated  
10/21/97 16:34:38 Alternate Source Available  
09/27/97 07:22:11 In Sync  
Preferred Source Fail  
Preferred Source Available  
Alternate Source Fail  
Alternate Source Available  
Out of Sync  
In Sync  
Peak Overload  
Peak Overload Gone  
Transfer Inhibit  
OK to Transfer  
Power Supply Fault  
Power Supply OK  
Switch in Normal Mode  
Manual Transfer to S1  
Manual Transfer to S2  
Bypass to S1  
09/27/97 07:21:08 Out of Sync  
06/01/97 02:10:32 Transferred to Preferred  
06/01/97 02:10:29 Preferred Source Available  
06/01/97 01:29:13 Transferred to Alternate  
06/01/97 01:29:13 Preferred Source Fail  
Bypass to S2  
Transferred to Alternate  
Transferred to Preferred  
Transfer Test Initiated  
Transfer Test Pended  
Transfer Test Passed  
Transfer Test Failed  
Table 6  
Example View Settings Response  
CURRENT SETTINGS:  
System Time:  
Nominal Voltage:  
Amps:  
10/21/97 16:23:54  
120  
24  
Frequency:  
60  
Phase:  
1
Neutral:  
YES  
Unit Type:  
UNDERFLOOR  
Sync Window:  
Auto Retransfer:  
Retransfer Delay:  
Current Inhibit:  
Inhibit Type:  
Transfer Test:  
Next Test:  
10  
ENABLED  
5
5
MANUAL  
ENABLED  
10/01/97 23:59:58  
Test Interval:  
Preferred Source  
90  
S1  
Operating Instructions  
13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
4.0 OPERATOR CONTROLS  
4.1  
Bypass/Transfer Control Switch  
The SmartSwitch is furnished with a Bypass/Transfer Control switch. The switch is located  
behind the hinged, keylocked cover. Figure 6 shows the switch positions.  
Normal Mode. The switch should be left in the “Normal” position for automatic transfer control.  
Automatic transfer control is inhibited in all switch positions other than the “Normal” position. In  
the “Normal” position, the switch will connect the load to the preferred source as long as the pre-  
ferred source is available. If the preferred source falls outside of the designated limits while the  
switch is in the “Normal” position and the alternate source is available and synchronized, the  
SmartSwitch will automatically transfer the load to the alternate source. To disable automatic  
transfers, place the Bypass/Transfer Control switch in any position other than “Normal.”  
Man. Xfer S1. Placing the Bypass/Transfer Control switch in the “Man. Xfer S1” position com-  
mands the SmartSwitch to transfer the load to source 1. If the load is already connected to source  
1, automatic transfers to source 2 will be disabled. If the load is connected to source 2, placing the  
switch in this position requests the SmartSwitch to transfer the load to source 1. The Smart-  
Switch will transfer the load to source 1 if source 1 is available and synchronized to source 2. The  
SmartSwitch will automatically delay transfer to source 1 until source 1 is available and within  
the preset phase synchronization window.  
Man. Xfer S2. Placing the Bypass/Transfer Control switch in the “Man. Xfer S2” position com-  
mands the SmartSwitch to transfer the load to source 2.  
If the load is already connected to source 2, automatic transfers to source 1 will be disabled. If the  
load is connected to source 1, placing the switch in this position requests the SmartSwitch to  
transfer the load to source 2. The SmartSwitch will transfer the load to source 2 if source 2 is  
available and synchronized to source 1. The SmartSwitch will automatically delay transfer to  
source 2 until source 2 is available and within the preset phase synchronization window.  
Bypass to S1. Placing the Bypass/Transfer Control switch in the “Bypass to S1” position  
bypasses the electronics and switching module and connects the load to source 1 by way of the  
bypass switch. In this position, control power is still available in the electronics module to allow  
the bypass status indicator to remain active. All other indicators, such as source available indica-  
tors, are not active in the bypass position. To avoid loss of power to the load, do not rotate  
the switch to the “Bypass to S1” position unless the load is connected to source 1 (and  
source 1 is available) when the switch is in the “Man. Xfer to S1” position.  
Bypass to S2. Placing the Bypass/Transfer Control switch in the “Bypass to S2” position  
bypasses the electronics and switching module and connects the load to source 2 by way of the  
bypass switch. In this position, control power is still available in the electronics module to allow  
the bypass status indicator to remain active. All other indicators, such as source available indica-  
tors, are not active in the bypass position. To avoid loss of power to the load, do not rotate  
the switch to the “Bypass to S2” position unless the load is connected to source 2 (and  
source 2 is available) when the switch is in the “Man. Xfer to S2” position.  
Figure 6 Bypass / Transfer Control Switch  
14  
Operator Controls  
Download from Www.Somanuals.com. All Manuals Search And Download.  
     
5.0 OPERATING GUIDELINES  
After installation, the following operating guidelines can be used for standard equipment opera-  
tion. These guidelines should be reviewed for any special equipment modifications, special site  
conditions, or company policies that may require changes to these operating guidelines.  
Initial System Turn-On. After the initial installation, equipment relocation, or extended period  
of inoperation, perform the initial system checkout. Have an electrician or other qualified electri-  
cal service person verify that the unit has been properly installed and connected to the input  
sources, including having the proper supply overcurrent protection and having the required quan-  
tity and size of input and output conductors based on the unit rating. Verify that both input power  
sources have a nominal voltage and frequency that match the unit rating. Verify that the two  
input power sources are synchronized. With load disconnected or turned off, and the Bypass/  
Transfer Control switch is in the “Normal” position, apply power to one of the SmartSwitch  
inputs. Verify that the SmartSwitch recognizes that the source is available and transfers to that  
source. Apply power to the second input and verify that the SmartSwitch recognizes that source is  
available, the transfer inhibit indicator is OFF, and transfers to the preferred source. Use the nor-  
mal operating procedures to verify proper SmartSwitch operation in all modes before connecting  
the load equipment. Failure of the SmartSwitch to operate properly may be due to installation  
errors, the power sources not being synchronized or otherwise compatible with the SmartSwitch  
ratings, or SmartSwitch failure. For assistance contact Liebert Global Services (in the U.S.,  
1-800-LIEBERT) or your local Liebert sales representative. After verifying proper SmartSwitch  
operation in all modes, connect the load equipment and verify proper load operation in all Smart-  
Switch operating modes.  
After completing the initial system Turn-On, refer to the following operational guidelines for  
standard equipment operation.  
Normal System Turn-On. The SmartSwitch can be started with either or both input power  
sources available and the Bypass/Transfer Control switch in any position. If the Bypass/Transfer  
Control switch is not in the “Normal” position, refer to the instructions pertaining to that position  
of the switch to return the Bypass/Transfer Control switch to the “Normal” position. If the  
Bypass/Transfer Control switch is in the “Normal” position, the SmartSwitch will automatically  
transfer the load to whichever source is first available. If both sources are available and synchro-  
nized, the SmartSwitch will transfer the load to the designated preferred source. For automatic  
source failure protection, the Bypass/Transfer Control switch must be in the “Normal” position.  
Manual Transfer to Source 1. Rotating the Bypass/Transfer Control switch to the “Man. XFER  
S1” position initiates a manual transfer to source 1. If the load is not currently connected to  
source 1, the SmartSwitch will transfer the load to source 1 if source 1 is available and synchro-  
nized. If the load is connected to source 1, the SmartSwitch will keep the load connected to source  
1, even if source 1 fails. The “Man. XFER S1” position is intended to be used for test transfer pur-  
poses and to ensure that the load is connected to source 1 before bypassing to source 1.  
Manual Transfer to Source 2. Rotating the Bypass/Transfer Control switch to the “Man. XFER  
S2” position initiates a manual transfer to source 2. If the load is not currently connected to  
source 2, the SmartSwitch will transfer the load to source 2 if source 2 is available and synchro-  
nized. If the load is connected to source 2, the SmartSwitch will keep the load connected to source  
2, even if source 2 fails. The “Man. XFER S2” position is intended to be used for test transfer pur-  
poses and to ensure that the load is connected to source 2 before bypassing to source 2.  
Bypass to Source 1. From the “Normal” position, rotate the Bypass/Transfer Control switch to  
the “Man. XFER S1” position to initiate transfer of the load to source 1. Use the indicator lights to  
verify that source 1 is available and the load is connected to source 1 before rotating the Bypass/  
Transfer Control switch to “Bypass To S1” position. If source 1 is not available and the load is not  
connected to source 1 before the switch is rotated to the “Bypass To S1” position, power to the load  
may be interrupted. If the load is connected to source 2 and the SmartSwitch will not transfer the  
load to source 1, initiate a bypass to source 2.  
Bypass to Source 2. From the “Normal” position, rotate the Bypass/Transfer Control switch to  
the “Man. XFER S2” position to initiate transfer of the load to source 2. Use the indicator lights to  
verify that source 2 is available and the load is connected to source 2 before rotating the Bypass/  
Operating Guidelines  
15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Transfer Control switch to “Bypass To S2” position. If source 2 is not available and the load is not  
connected to source 2 before the switch is rotated to the “Bypass To S2” position, power to the load  
may be interrupted. If the load is connected to source 1 and the SmartSwitch will not transfer the  
load to source 2, initiate a bypass to source 1.  
System Shutdown. Power to both SmartSwitch inputs must be turned OFF to ensure system  
shutdown.  
Transfer Test. For continued protection against the SmartSwitch failure, periodic transfer test-  
ing of the SmartSwitch is recommended.  
For manual transfer test, with both input sources available and synchronized (no Summary  
Alarm present), rotate the Bypass/Transfer Control switch from the “Normal” to “Man. XFER S1”  
or “Man. XFER S2” positions (whichever is the alternate source) and observe proper switch trans-  
fers (observe change in “On Preferred Source” and “On Alternate Source” indicator lights). Return  
Bypass/Transfer Control switch to the “Normal” position and after the retransfer delay, observe  
proper switch transfer back to the preferred source (observe change in “On Alternate Source” and  
“On Preferred Source” indicator lights).  
For automatic (programmable) transfer testing, see the RS-232 communications port information  
in 3.3 - RS-232 Communications Port.  
Preferred Source Selection. The SmartSwitch allows either input source to be designated as  
the preferred source to which the load is transferred to and remains transferred to as long as the  
source remains available.  
For 13 to 20 amp units in the rackmount enclosure (see Figure 2), to change the preferred source,  
place the unit in bypass to either input source, following the bypass procedure. Unlock and the  
removable electronics module. Slide out (remove) the electronics module from the main enclosure.  
Rotate the Preferred Source selector switch located on the rear of the electronics module to the  
desired preferred source. Re-insert the electronics module in the main unit completely and lock  
the electronics module.  
On 25 to 60 amp units in the wall-mount and underfloor enclosure (see Figure 3), the preferred  
source is indicated by labeling on the top of the unit. To change the preferred source, place the  
unit in bypass to either input source, following the bypass procedure. Unlock and unlatch the two  
latches on the removable electronics module. Remove the electronics module from the main enclo-  
sure. Rotate the electronics module and re-insert in the main unit. Re-latch and lock the two  
latches on the electronics module. Verify that the labeling on the top of the unit indicates that the  
desired source is the preferred source.  
16  
Operating Guidelines  
Download from Www.Somanuals.com. All Manuals Search And Download.  
6.0 MAINTENANCE  
WARNING  
!
THERE ARE NO USER-SERVICEABLE PARTS INSIDE THE  
REMOVABLE ELECTRONICS MODULE. OPENING OR  
REMOVING THE COVER OF THE REMOVABLE ELECTRONICS  
MODULE MAY EXPOSE HAZARDOUS VOLTAGES, EVEN WHEN  
THE SMARTSWITCH IS IN BYPASS. DO NOT ATTEMPT TO  
SERVICE THIS PRODUCT YOURSELF. REFER ALL SERVICING  
TO QUALIFIED SERVICE PERSONNEL.  
CAUTION  
!
The unit is supplied by two power sources. Unit may be  
electrically live if either of the two input sources is ON, even  
when the electronics module is removed. Lethal voltages exist  
inside the unit. Turn OFF and lock out BOTH input power sources  
before removing covers or working inside.  
Minimal periodic maintenance of the SmartSwitch is required in normal operation. For assurance  
of continued protection against SmartSwitch failure, periodic transfer testing of the Smart Switch  
is recommended. For manual transfer tests, refer to the transfer test information in the operating  
guidelines section of this manual. For automatic transfer tests at programmed intervals, see the  
RS-232 communication port information in the operating instructions in 3.3 - RS-232 Communi-  
cations Port.  
The SmartSwitch includes a replaceable electronics module. To replace the electronics module,  
follow the unit bypass instructions and place the unit on bypass to the source that is currently  
supplying the load. Unlock and unlatch the electronics module. Slide the electronics module out of  
the SmartSwitch. Replace the module with a module having the same part number or approved  
equivalent. Failure to use the approved replacement module may result in misoperation of or  
damage to the SmartSwitch.  
Monitoring of the SmartSwitch status (such as by way of the status relay output) is strongly rec-  
ommended to allow detection of source failures or SmartSwitch failures before loss of power to the  
load. A summary alarm in the absence of any source failure or transfer inhibit alarm generally  
indicates a SmartSwitch failure. Prompt action to identify and correct the situation is recom-  
mended to prevent loss of power to the load.  
Even the most reliable equipment can fail. For information or repair assistance, contact your local  
Liebert representative or Liebert Global Services. To contact Liebert Global Services in the U.S.,  
call 1-800-LIEBERT.  
Maintenance  
17  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
18  
Maintenance  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SmartSwitch™  
Automatic Transfer Switch  
Technical Support  
U.S.A. 1-800-LIEBERT  
Outside the U.S.A. +614-841-6755 or 1-800-222-5877  
U.K. +44 (0) 1628 403200  
France +33 (0) 1 43 60 01 77  
Germany +49 89 99 19 220  
Italy +39 2 98250 1  
Netherlands +31 (0) 475 503333  
Web site http://www.liebert.com  
Worldwide FAX +614-222-5877 option #4  
tech support  
The Company Behind The Products  
With more than 500,000 installations around the globe, Liebert is the world leader in computer  
protection systems. Since its founding in 1965, Liebert has developed a complete range of support  
and protection systems for sensitive electronics:  
• Environmental systems: close-control air conditioning from 1.5 to 60 tons.  
• Power conditioning and UPS with power ranges from 250 VA to more than 1000 kVA.  
• Integrated systems that provide both environmental and power protection in a single, flexible  
package.  
• Monitoring and control — on-site or remote — from systems of any size or location  
Service and support, through more than 100 service centers around the world, and a 24-hour  
Customer Response Center.  
While every precaution has been taken to ensure accuracy and completeness of this literature,  
Liebert Corporation assumes no responsibility, and disclaims all liability for damages resulting  
from use of this information or for any errors or omissions.  
© 2000 Liebert Corporation. All rights reserved throughout the world. Specifications subject to  
change without notice.  
® Liebert and the Liebert logo are registered trademarks of Liebert Corporation. All names  
referred to are trademarks or registered trademarks of their respective owners.  
Printed in U.S.A.  
SL-20320  
Revised: February 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Lenovo Tablet N3S2PUK User Manual
LG Electronics Blu ray Player GBW H20L User Manual
LG Electronics Speaker System LSB316 User Manual
Linksys Switch SD2005 User Manual
LOREX Technology DVR L19LD1600 Series User Manual
Majestic Appliances Gas Heater UVS33RN User Manual
Maytag Washer MAH 24 User Manual
Meridian America CD Player 800 Version 4 User Manual
MicroNet Technology Network Router SP3367A User Manual
MidiLand Speaker System S4 3050M User Manual