Rtd Impedance Test - ABB XSeries G4 6200 User Manual

2) Disconnect the RTD from the termination board, if not already done.
3) Set the DMM to 200 mVDC.
4) Select the RTD test resistance value by selecting the resistor test
5) Clip the positive lead of the DMM to the upper side of the RTD test resistor.
6) Clip the negative lead of the DMM to the lower side of the RTD test resistor.
7) Supply power to the unit.
8) Once running, the measured value across the RTD test resistor should be
9) The RTD measurement temperature on the G4 EX display should read
10) If either of the measured values are outside of the range, remove power and
11) Return power, and perform steps 9 and 10 again. If either of the measured
12) Return power, and perform steps 9 and 10. If either of the measured values

5.2.6 RTD Impedance test

If readings from the RTD are still suspect following the RTD Probe test, follow the
instructions below to test the current source on the termination board to verify that
it is receiving power.
5.2.6.1
-
-
5.2.6.2
1) Immerse RTD probe in ice bath.
2) Perform a continuity check between any two similarly colored wires.
3) Perform a continuity check between any two dissimilar colored wires.
4) Perform a continuity check between shield wire and any other wires.
2104349 rev. AD
connection from the FCU Diagnostic kit, or make one using a resistor
appropriate for the unit.
- Substitute the RTD probe wiring by connecting either a 100 OHM or
123 OHM resistor across connector terminals 3 and 4.
- Connect a jumper wire between terminals 2 and 3.
- Connect a jumper wire between terminals 4 and 5.
either:
100 OHM Resistor – Min of 100mv to a maximum of 125mv
-
123 OHM Resistor – Min of 123mv to a maximum of 155mv
-
either:
100 OHM Resistor – 31.0°F to 33.0°F
-
123 OHM Resistor – 140.8°F to 142.8°F
-
replace the RTD.
values are outside of range, remove power, and replace the main
termination board.
are outside of the range, remove power, and replace the EXIMV.
Required equipment
Ice Bath
Digitial MultiMeter
Step-by-step instructions
Measured resistance should be 1 OHM or less.
Measured resistance should be approximately 100 OHMs.
Measured resistance should be in the Megohm range.
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