Omega Vehicle Security Welding System DRA DCC 8 User Manual

Use r’s Gu id e  
http://www.omega.com  
e-mail: info@omega.com  
DRA-DCC-8  
DIGITAL TO 8 CURRENT LOOP CONVERTER  
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Contents  
1. MOUNTING INSTRUCTIONS  
2. REPLACING FUSES  
3. ASSEMBLY  
4. SUPPLY VOLTAGE  
5. MODES OF OPERATION  
5.1 0-20 or 4-20mA output current selection  
5.2 Switch Settings  
6. PARALLEL CONTROL MODE  
6.1 PLC Interface  
6.2 The "E" (ENABLE) Terminal  
7. SERIAL CONTROL MODE  
7.1 RS232c / RS422 Select  
7.2 RS422 Termination  
7.3 Serial Control Switch Settings  
7.4 Serial Communication Parameters  
7.4.1 Baud Rate Select  
7.4.2 ID Code  
7.4.3 Command Formats  
8. SELF TEST MODES  
8.1 Self Test # 1  
8.2 Self Test # 2  
8.3 Self Test # 3  
9. MULTIDROP CONFIGURATION  
10. PUTTING THE UNIT INTO OPERATION  
11. CALIBRATION  
12. SPECIFICATIONS  
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1. MOUNTING INSTRUCTIONS  
The DRA-DCC-8 is designed for standard DIN rail mounting.  
Place the unit on the upper part of the mounting rail with the fastening tab facing  
down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit  
to the rail. Once the tab is loosened, ensure that the unit is fastened securely in  
place.  
2. REPLACING FUSES  
In order to replace a blown fuse, the unit has to be disassembled, as follows:  
a. Take off both terminal strips by removing the four screws at the edges.  
Note: This does not require disconnecting the cables connected to the strips.  
b.  
Remove the front panel using a suitable flat screwdriver. Press down gently on  
the plastic springloaded tabs located in the slots either side of the unit.  
c. Disconnect the flat connector which couples the LED circuit on the front panel.  
d. Replace the blown fuse.  
WARNING: Never install a fuse rated more than 800mA  
3. ASSEMBLY  
The DRA-DCC-8 unit includes  
two printed circuit cards  
designated as P.N 7041 and  
P.N 7040. The two printed  
circuit cards should occupy  
the slots in the enclosure  
according to fig 1.  
Figure 1  
Insert the two printed cards into their slots. Connect the flat cable between them.  
Connect the front panel flat cable. The panel must be inserted into the grooves on  
both sides of the case while pressing down until a distinct "click" is heard. Assembly  
is completed by laying the terminal strips in place.  
Note: The terminal strips are polarized and must not be placed backwards.  
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4. SUPPLY VOLTAGE  
The DRA-DCC-8 is powered by a DC power supply at a range of 15-32Vdc. In order  
to determine the minimum supply voltage, use the following equation:  
Vmin = 8 + Rload() * 0.02  
where:  
Vmin is the minimum required supply voltage.  
Rload() is the maximum output load including the leads resistance.  
Note: If Vmin turns to be less than 15V, the minimum required voltage  
should be 15 Vdc.  
5. MODES OF OPERATION  
The DRA-DCC-8 unit can be operated in several modes, determined by an internal  
array of 8 DIP switches as follows:  
4-20 or 0-20mA output current mode  
Parallel control mode  
Serial control mode  
Self test mode  
5.1 0-20 OR 4-20mA OUTPUT CURRENT MODE  
Two current output spans are available: 4-20mA or 0-20mA selected by SW6.  
The DRA-DCC-8 receives 12 bits of data which determine the output current value.  
A channel data value of 4095 (FFF) is always interpreted as a 20mA output current.  
A channel data value of 0 (000) will produce a 0mA output current when SW6  
is OFF, or 4mA when ON.  
5.2 SWITCH SETTINGS  
Parallel Control Mode  
MODE  
S1  
S2  
S3  
X
S4  
X
S5  
X
S6  
S7  
0-20mA  
4-20mA  
OFF OFF  
OFF OFF  
OFF OFF  
ON OFF  
X
X
X
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Serial Control Mode  
BAUD RATE (BPS)  
300  
S1 S2 S3  
S4 S5  
S6  
S7  
ON  
ON  
OFF OFF  
ON OFF  
OFF ON  
ON ON  
ON=4-20mA  
4800  
9600  
UNIT ID CODE  
OFF=0-20mA ON  
ON  
19200  
SW5 MSB  
Self Test Mode  
S1 S2 S3  
MODE  
SELF TEST#1  
S4  
X
S5  
S6  
S7  
ON OFF  
OFF ON  
ON ON  
X
*
OFF  
OFF  
OFF  
X
SELF TEST#2  
SELF TEST#3  
X
*
* according to para #5.2  
6. PARALLEL CONTROL MODE  
MODE  
S1  
S2  
S3  
S4  
X
S5  
S6  
*
S7  
PARALLEL MODE  
OFF OFF  
OFF  
* according to para #5.2  
In the parallel control mode, the DRA-DCC-8 unit is controlled via a 15 bit bus.  
Three Address bits (A0-A3) select the proper current output channel and 12 Data  
bits (D0-D11) determine its value (A0 and D0 are MSB). The DRA-DCC-8  
microprocessor continuously scans the input vector (Address + Data) terminals  
and updates its memory tables upon recognizing a new vector. The unit is  
asynchronous in nature. The data should be valid for at least 160 microseconds.  
SOURCE  
SINK  
6.1 PLC INTERFACE  
The PLC's output modules can be divided into  
three popular types; TTL output module, 24Vdc  
sink type and 24Vdc source type.  
There is a jumper selector on printed circuit card  
PN 7040 which selects between Sink/ Source  
input. (TTL output module should usualy be  
considered as sink type). See figure 2.  
Figure 2.  
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6.2 THE "E" (ENABLE) TERMINAL  
For E="1" the unit is enabled, which means that all input vectors are received and  
the output is updated. When E="0" the unit ignores any new input vector. The E  
terminal is recommended to be used as a strobe for parallel data which has a long  
setup time. In this case the following sequence is recommended: prior to applying  
a new vector, the E terminal should be set to logical 0 (inhibit state), then the new  
input vector should be imposed. Once the new data is set, the E terminal should  
be pulsed.  
The E terminal is also used for multidrop configuration. The 15 bit vectors are  
applied to the units in parallel and the selection is carried out by controlling the  
"E" inputs.  
7. SERIAL CONTROL MODE  
7.1 RS232c / RS422 SELECT  
he DRA-DCC-8 is equipped with two serial  
communication ports: The RS232c and the  
RS422. A jumper switch at the right side of the  
DIP switch array is used to select the required  
communication type. See figure 3.  
RS-422  
RS-232c  
Figure 3.  
7.2 RS422 TERMINATION  
The SW8's ON state terminates the RS422 receiver terminals with a 100W load.  
In a multidrop configuration, the last (most distant) DRA-DCC-8 unit should be  
terminated in order to match the transmission lines.  
Note: Only one termination load per RS422 communication link is permissible.  
7.3 SERIAL CONTROL SWITCH SETTINGS  
S1  
BAUD RATE  
* according to para #5.2  
S2  
S3  
S4  
S5  
S6  
*
S7  
ID CODE  
ON  
7.4 SERIAL COMMUNICATION PARAMETERS  
The communication protocol is 8 bit ASCII, even parity, and one stop bit.  
5
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7.4.1 BAUD RATE SELECT  
SW1 and SW2 select one out of four available baud rates.  
SW1  
OFF  
ON  
SW2  
OFF  
OFF  
ON  
300 BPS  
4800 BPS  
9600 BPS  
19200 BPS  
OFF  
ON  
ON  
7.4.2 ID CODE  
Up to eight DRA-DCC-8s can be connected in a multidrop configuration. Switches  
SW3, SW4, and SW5 (MSB) set the ID code.  
7.4.3 COMMAND FORMATS  
Three types of command formats are available:  
Without echo back  
The host computer sends a massage and does not receives an  
acknowledgment.  
With echo back  
The host computer sends a message and receives an acknowledgment stating  
the DRA-DCC-8 ID number and the addressed channel number.  
Status report  
7.4.3.1. WITHOUT ECHO BACK FORMAT  
[A] [ID CODE] [CHANNEL VALUE] [CR]  
The character A begins the command block.  
The second byte is the ID code (07). The third byte is the addressable channel  
number (07). Up to four bytes of a channel's value can be in BCD mode (0-4095).  
Leading zeroes can be omitted. The last byte is [CR] which must terminate the  
command block.  
7.4.3.2. WITH ECHO BACK FORMATS  
[C] [ID CODE] [CHANNEL VALUE] [CR]  
This format differs only in the opening character. After every command block  
transfer, the DRA-DCC-8 echoes back the following:  
6
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[C] [ID CODE CHANNEL] [LF] [CR]  
Note: If the value is omitted it will be treated as zero. Separators such as  
blanks or commas are not allowed.  
Example:  
Channel 4 in DRA-DCC-8 no. 7 has to receive the value of 981. Echo back is required  
The command format is:  
[C] [7] [4] [981] [CR]  
The echo back will be: C 7 4  
Note: The channel numbers on the DRA-DCC-8 front panel are designated  
from 1 to 8, in binary they are designated from 0 to 7.  
Note: When applying the echo back mode, it is advisable to wait for the  
echo back before transmitting a new command.  
7.4.3.3 STATUS REPORT FORMAT  
[S] [ID CODE] [CR]  
The addressed DRA-DCC-8 unit will respond with the values stored in its eight  
channels. The response will start with S, ID code, following with eight channel  
values separated with commas and [LF] [CR] as terminators.  
Example:  
DRA-DCC-8 unit number 3 has the following stored data: ch1: 300, ch2: 1270,  
ch3: 0, ch4: 4087, ch5: 2099, ch6: 764, ch7: 3078, ch8: 550. The response from  
the device will be:  
S3,300,1270,0,4087,2099,764,3078,550 [LF] [CR].  
Note: Wait until the status report has terminated before transmitting new  
commands.  
8. SELF TEST MODES  
The DRA-DCC-8 is provided with three test modes.  
MODE  
SELF TEST#1  
S1  
S2  
S3  
S4  
X
S5  
S6  
S7  
ON  
OFF  
X
*
OFF  
OFF  
OFF  
X
SELF TEST#2  
SELF TEST#3  
OFF ON  
ON ON  
X
*
* according to para #5.2  
7
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8.1 SELF TEST #1 (Communication Ports Test)  
In order to test the serial communication ports, this test mode converts the unit to  
a transponder for ASCII characters. Any transmitted character will be echoed to  
the host terminal. The host parameters should be set to:  
Baud rate : 4800, Word length: 8 bits, Parity: even, Stop bit: 1  
8.2 SELF TEST #2 (Same Leve)l  
In this test mode, the DRA-DCC-8 unit ignores the address field. All the outputs  
are set according to the data field only.  
8.3 SELF TEST #3 (Saw Tooth)  
In this test mode, only one output channel (according to the address setting) will  
produce a saw tooth wave form in which the whole value range is used.  
9. MULTIDROP CONFIGURATION  
Up to eight DRA-DCC-8 units can be installed in a multidrop configuration using  
the RS422 communication port.  
The controller's RS-422 transmitter is connected to the units' receivers while the  
controller's RS-422 receiver is connected to the units' transmitters.  
As the communication cable might be several thousand feet long, it is necessary  
to terminate the end of the line with its characteristic impedance in order to avoid  
reflections in the transmission line causing data distortion. SW8 in its ON state  
terminates the Rx inputs with a 100load.  
10. PUTTING THE UNIT INTO OPERATION  
The DRA-DCC-8 is supplied with a set configuration for parallel control mode.  
The DIP switch setting is:  
S1  
S2  
S3  
S4  
S5  
S6  
S7  
MODE  
PARALLEL 4-20mA  
OFF OFF OFF OFF OFF  
ON OFF  
The communication port selector (see para #7.1) is set to RS232C.  
The unit should be set up according to the required configuration.  
Before applying voltage to the unit see para #4 for power supply consideration.  
8
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The channel LEDs are connected in series with the output current so that they will  
light only as an indication of a closed current loop.  
Note: After every power on, the unit is reset and the initialized  
default output currents are according to the SW6 setting  
(see para #5.2).  
In the parallel control mode, internal pull-up resistors on each of the input terminals  
keep them in logical 1 state. The unit will recognize input voltage up to 0.5V as  
logical 0 and voltages from 4V to 60V as logical 1.  
11. DRA-DCC-8 CALIBRATION  
Generally there is no need to calibrate the DRA-DCC-8 unit. However if calibration  
is required, the following steps should be carried out: Two potentiometer trimmers,  
one for "Zero" and the other for "Span" are located on printed card 7040. The  
trimmer close to the card edge is the "Zero". Use the following switch setup for  
switching all the outputs between 4 and 20mA  
MODE  
S1  
S2  
S3  
X
S4  
X
S5  
X
S6  
S7  
ALL CH. = 4mA  
OFF OFF  
ON OFF  
ON OFF  
ALL CH. = 20mA OFF ON  
X
X
X
Note: Set the unit to sink mode (fig.2).  
Step 1:  
Select one channel (for example ch.#1) for the initial tuning. Set the DIPswitch array  
to "all 4mA".  
Apply supply voltage to the unit. The initial state of all the output currents is 4 mA.  
Use SW2 to switch all the outputs between 4 and 20mA. Iteratively set the "Zero"  
and the "Span" trimmers for 4.00mA and 20.00mA.  
Step 2:  
Monitor all the 8 channels in 4mA state, and calibrate the Zero trimmer so that  
their average readings is 4.000mA.  
Then repeat for 20mA state, and calibrate the Span trimmer so that their average  
readings is 20.000mA. This procedure should be repeated until calibration is  
satisfactory.  
9
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12. SPECIFICATIONS  
INPUTS:  
PARALLEL INPUTS  
Parallel & Serial control inputs  
3 - Output current loop address  
12 - Output current value (Data)  
1- Enable (E)  
LOGIC LEVELS:  
0<"0"<0.5V, 4 <"1"< 60V  
160 microsecond  
DATA HOLD TIME:  
MAXIMUM PARALLEL INPUT RATE:  
SERIAL COMMUNICATION  
6000 updates per second  
RS232c full duplex  
RS422 full duplex  
BAUD RATES:  
PARITY:  
300, 4800, 9600, 19200 BPS  
Even  
STOP BIT:  
One  
STATUS REPORT:  
MULTIDROP CAPABILITY:  
Reports as interrogated  
Up to eight units  
OUTPUTS:  
OUTPUT CURRENT SPAN:  
OUTPUT CURRENT SETTLING TIME:  
8 continues current loops  
0-20mA or 4-20mA (user selected)  
4.2 ms max. for 99% of step  
POWER SUPPLY:  
15-32 Vdc (regulated)  
85mA max.  
CURRENT CONSUMPTION:  
MAXIMUM LOOP RESISTANCE:  
ACCURACY:  
According to Rmax(K  
)= (Vsupply -6)/ 20  
0.2% of span max.  
±0.1% of span typical,  
±
RESOLUTION:  
0.025% of span typical,0.05% of span max.  
INDICATORS:  
Yellow Power On LED  
8 Red output channel LEDs  
AMBIENT TEMPERATURE  
Operation:  
Storage:  
-10 to 60 oC (14 to 140 oF)  
-25 to +85 oC (-13 to 185 oF)  
RELATIVE HUMIDITY:  
5 to 95%, non condensing  
HOUSING  
Box:  
Terminals:  
Plastic Polycarbonate  
According to IP 50 DIN 40050  
According to IP 20 DIN 40050  
MOUNTING:  
FUSE:  
Standard DIN rail  
630mA fast blow (5x20mm)  
0.7Kg (1.5 lb.)  
WEIGHT:  
DIMENSIONS:  
73.2H x 200W x 121mmD (2.88"x7.88"x4.76")  
10  
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WARRANTY/DIS CLAIMER  
OMEGA ENGINEERING, INC. w a rra n ts th is u n it to b e fre e o f d e fe cts in m a te ria ls a n d workm anship  
fo r a p e rio d o f 1 3 m o n t h s fro m d a te o f p u rch a s e . OMEGA Wa rra n ty a d d s a n a d d itio n a l o n e (1) m o n th  
g ra ce p e rio d to th e n o rm a l o n e (1 ) y e a r p r o d u c t w a r r a n t y to cover handling and shipping tim e. This  
ensures that OMEGA’s custom ers receive m axim um coverage on each product. If the unit should m alfunction,  
it m ust be returned to the factory for evaluation. OMEGAs Custom er Service Departm ent will issue an Authorized  
Return (AR) num ber im m ediately upon phone or written request. Upon exam ination by OMEGA, if the unit is  
found to be defective it will be repaired or replaced at no charge. OMEGAs WARRANTY does not apply to defects  
resulting from any action of the purchaser, including but not lim ited to m ishandling, im proper interfacing,  
operation outside of design lim its, im proper repair, or unauthorized m odification. This WARRANTY is VOID if  
the unit shows evidence of having been tam pered with or shows evidence of being dam aged as a result  
of excessive corrosion; or current, heat, m oisture or vibration; im proper specification; m isapplication; m isuse  
or other operating conditions outside of OMEGAs control. Components which wear are not warranted, including  
but not lim ited to contact points, fuses, and triacs.  
OMEGA is p le a s e d t o o ffe r s u g g e s t io n s o n t h e u s e o f it s va rio u s p ro d u c t s . Ho w e ve r,  
OMEGA n e it h e r a s s u m e s re s p o n s ib ilit y fo r a n y o m is s io n s o r e rro rs n o r a s s u m e s  
lia b ilit y fo r a n y d a m a g e s t h a t re s u lt fro m t h e u s e o f it s p ro d u c t s in a c c o rd a n c e  
w it h in fo rm a t io n p ro vid e d b y OMEGA, e it h e r ve rb a l o r w rit t e n . OMEGA w a rra n t s  
o n ly t h a t t h e p a rt s m a n u fa c t u re d b y it w ill b e a s s p e c ifie d a n d fre e o f d e fe c t s .  
OMEGA MAKES NO OTHER WARRANTIES OR REP RES ENTATIONS OF ANY KIND  
WHATS O EVER, EX P RES S ED O R IM P LIED , EX C EP T THAT O F TITLE, A N D A LL  
IM P LIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND  
FITNES S FOR A PARTICULAR P URP OS E ARE HEREBY DIS CLAIMED. LIMITATION  
OF LIABILITY: Th e re m e d ie s o f p u rc h a s e r s e t fo rt h h e re in a re e xc lu s ive a n d t h e  
t o t a l lia b ilit y o f OMEGA w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t ,  
w a rra n t y, n e g lig e n c e , in d e m n ific a t io n , s t ric t lia b ilit y o r o t h e rw is e , s h a ll n o t e xc e e d  
t h e p u rc h a s e p ric e o f t h e c o m p o n e n t u p o n w h ic h lia b ilit y is b a s e d . In n o e v e n t  
s h a ll O M EG A b e lia b le f o r c o n s e q u e n t ia l, in c id e n t a l o r s p e c ia l d a m a g e s .  
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in m edical  
applications or used on hum ans. Should any Product(s) be used in or with any nuclear installation or activity,  
m edical application, used on hum ans, or m isused in any way, OMEGA assum es no responsibility as set forth  
in our basic WARRANTY / DISCLAIMER language, and additionally, purchaser will indem nify OMEGA and  
hold OMEGA harm less from any liability or d a m a g e w h a t s o e v e r a r is in g o u t o f t h e u s e o f t h e  
P r o d u c t (s ) in s u c h  
a
m a n n e r.  
RETURN REQUES TS / INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Custom er Service Departm ent.  
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED  
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID  
PROCESSING DELAYS). The assigned AR num ber should then be m arked on the outside of the return  
package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent  
breakage in transit.  
FOR WARRANTY RETURNS, please have the  
following inform ation available BEFORE contacting  
OMEGA:  
FOR NON-WARRANTY REPAIRS, consult  
OMEGA for current repair charges. Have the  
following inform ation available BEFORE  
contacting OMEGA:  
1. P.O. num ber under which the product was  
PURCHASED,  
1. P.O. num ber to cover the COST  
of the repair,  
2. Model and serial num ber of the product under  
warranty, and  
2. Model and serial num ber of product, and  
3. Repair instructions and/or specific  
problem s relative to the product.  
3. Repair instructions and/or specific problem s  
relative to the product.  
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible.  
This affords our custom ers the latest in technology and engineering.  
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.  
©
Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied,  
photocopied, reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in  
w h o le o r in p a r t , w it h o u t p r io r w r it t e n c o n s e n t o f O M EG A EN G IN EERIN G , IN C.  
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Pro ce ss Me a su re m e n t a n d Co n tro l?  
O MEGA…O f Co u rse !  
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ߜ
 Metering & Control Instrumentation  
ߜ
 Refractometers  
ߜ
 Pumps & Tubing  
ߜ
 Air, Soil & Water Monitors  
ߜ
 Industrial Water & Wastewater Treatment  
ߜ
 pH, Conductivity & Dissolved Oxygen Instruments  
M2612/ 0197  
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