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3... I
NTERFACE
M
ODULES
U
SING THE
OMP-MODL
3-43
nearly the same level of error compensation as the 4-wire
configuration with one less wire.
Due to the fact that only one of the lead wires resistance is actually
measured and the other lead wire is assumed to match, in using the
3-wire configuration, it is important that both lead wires used for the
excitation current (connected to terminals 1 & 2, or 7 & 8 and
opposite ends of the element) are of the same approximate length,
same gauge, and operating at the same temperature. The third lead
(connected to terminal 4 or 10) can be of lighter gauge if desired as
a very low current flows through it.
3-Wire Terminal Strip Connections:
As can be seen in the 3-Wire Wiring Diagram, each channel
requires 6 of the 12 terminals. Channel A uses terminals 1 through
6, and Channel C uses terminals 7 through 12.
Two matching gauge Excitation wires should connect from opposite
ends of the element and to terminals 1-2 or 7-8 on the module
terminal strip. A third Sense wire then connects from the element
(sharing the connection with a lead from terminal 1 or 7 on the
terminal strip) to terminal location 4 or 10. Two wire jumpers must
then be installed connecting terminals 2-3 and 5-6 for Channel A
and 8-9 and 11-12 for Channel C.
Refer to Chapter 6 for steps to generate a Terminal Strip Wiring
printout after construction of a Program Net for use in making field
wiring connections.
For long lead wire runs and in applications in electrically noisy
environments, it is recommended that twisted pair and/or shielded
wire be used. If shielded wire is used, the shield at the OMP-MODL
end should be connected to an external earth ground (Figure 3... -
29) or if available, a grounded Shield connection provided on
another type installed interface module (such as the MLIM-1).
2
1
12
11
10
9
8
7
6
5
4
3
RTD Element
Cable Shield
A
C
Jumpers
3rd Wire used as SENSE lead
Connect Shield to an Earth Ground
ML126
Figure 3... -29: 3-Wire Configuration
Summary of Contents for OMP-MODL
Page 1: ......
Page 9: ...1 INTRODUCTION USING THE MODULOGGER 1 7 13 ...
Page 23: ...2 OMP MODL System Base Using the OMP MODL 2 14 NOTES ...
Page 24: ...2 ModuLogger System Base Using the ModuLogger 2 1 ...
Page 30: ...3 INTERFACE MODULES USING THE OMP MODL 3 6 NOTES ...
Page 70: ...3 INTERFACE MODULES USING THE OMP MODL 3 46 NOTES ...
Page 76: ...3 INTERFACE MODULES USING THE OMP MODL 3 52 NOTES ...
Page 82: ...3 INTERFACE MODULES USING THE OMP MODL 3 58 NOTES ...
Page 83: ...3 INTERFACE MODULES USING THE MODULOGGER 3 1 ...
Page 105: ...5 HYPERCOMM COMMUNICATIONS USING THE OMP MODL 5 18 NOTES ...
Page 106: ...5 HYPERCOMM COMMUNICATIONS USING THE MODULOGGER 5 1 ...
Page 117: ...6 PCMCIA CARD CONFIGURATION AND USE USING THE MODULOGGER 6 1 ...
Page 134: ...7 HYPERNET ICON BASED PROGRAMMING USING THE OMP MODL 7 17 NOTES ...
Page 141: ...8 P P C D U OMP MODL ...
Page 149: ...9 HYPERPLOT GRAPHIC DATA DISPLAY USING THE OMP MODL 9 8 ...
Page 161: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 12 NOTES ...
Page 162: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 1 ...
Page 163: ...11 APPENDICES USING THE OMP MODL 11 1 11 APPENDICES ...
Page 164: ...11 APPENDICES USING THE OMP MODL 11 2 NOTES ...
Page 270: ...11 APPENDIX A MASTER ICON FILE REFERENCE USING THE OMP MODL 11 108 ...
Page 276: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 114 NOTES ...
Page 278: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 116 NOTES ...
Page 279: ......
Page 282: ...11 APPENDIX E CHANGING THE OMP MODL EPROM USING THE OMP MODL 11 120 NOTES ...
Page 288: ...11 APPENDIX G HYPERNET THEORY OF OPERATION USING THE OMP MODL 11 126 NOTES ...
Page 290: ...11 APPENDIX I RS 232 CABLE PORT AND ADAPTER USING THE OMP MODL 11 128 NOTES ...
Page 297: ...11 APPENDIX K MODEM CONFIGURATION USING THE OMP MODL 11 135 ...