Resistive Temperature Detector (Rtd) Continuity Test; Rtd Current Source (Resistive) Test - ABB XSeries G4 6200 User Manual

5.2.4 Resistive Temperature Detector (RTD) Continuity test

Should the readings from the RTD be suspect, follow the instructions below to test
the RTD probe.
5.2.4.1
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5.2.4.2
1) Begin by disconnecting power and communications from the EXIMV.
2) Disconnect the RTD from the EXIMV.
3) Perform continuity test of the wires leading to the probe. Set DMM to 200
4) Check the continuity of the first wire pair (typically red or black) by
5) If there is continuity, move to step 7. If there is no continuity, verify the
6) If the wiring at the connection head is correct, the RTD is defective. Replace
7) Check the continuity of the second wire pair (typically white) be connecting
8) Check the continuity of each wire (first pair either red or black, as identified
9) Check the continuity of each second wire pair (white, as identified in step 7)
10) Check the continuity of each first wire pair (as identified in step 4) to each
11) If the probe is still not functioning properly, recheck the wiring using the

5.2.5 RTD Current Source (Resistive) test

If the readings from the RTD are still suspect following the RTD Probe Continuity
test, follow the instructions below to test the current source on the termination
board to verify that it is receiving power.
5.2.5.1
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5.2.5.2
1) Begin by disconnecting power and communications from the termination
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Required equipment
Digital Multi-meter (DMM) with alligator clip leads
Step-by-step instructions
OHM or Continuity Audio.
connecting one lead to each wire. The meter should read zero or close to
zero.
wiring at the RTD head is correct.
the probe; otherwise, continue to the next step.
one lead to each wire. The meter should read zero or close to zero.
in step 4) to the probe or shield. If there is continuity, the RTD is defective.
Replace the probe. If there is no continuity, continue to the next step.
to the probe or shield. If there is continuity, the RTD is defective. Replace
the probe. If there is no continuity, continue to the next step.
second pair wire (as identified in step 7). The meter should read
approximately 100 to 140 OHMs. If this is the case, continue to the next
step. If not, the RTD is defective and should be replaced.
supplied diagram. If no wiring error was found, perform the RTD Current
Source Troubleshooting test.
Required equipment
Totalflow Diagnostics Kit
Digital Multi-meter with alligator clip leads
Step-by-step instructions
board, if not already done.
2104349 rev. AD