ABB XSeriesG4 User Manual page 142

Restore power to flow computer. If A/D Failure alarm is not corrected, continue to the next step.
Perform the Save and Restore function, see section 5.2.2 Backing up Configuration Files, page 90.
Restore these files to the tfCold Drive, see section 5.2.3 Restoring Configuration Files, page 90.
Perform a Cold start on the Flow Computer, see section 5.4 Performing a Cold Boot, page 92. If problem is not
corrected, continue to next step.
Check the RTD wiring at the XIMV.
Perform the following three procedures, see section(s) 6.2.5 Resistive Temperature Detector (RTD) Continuity Test,
page 123, 6.2.6 RTD Current Source (Resistive) Test, page 123, 6.2.7 RTD Impedance Test, page 124.
- RTD Continuity Test
- RTD Resistive Test
- RTD Impedance Test
Contact Totalflow to repair or replace the XIMV.
7.2.5 Resistive Temperature Detector (RTD) Continuity Test
Should the readings from the RTD be suspect, follow the instructions below to test the RTD probe.
Required Equipment:
— -Multi Meter (MM) w/ alligator clip leads
To perform a Resistive Temperature Detector (RTD) continuity test:
Begin by disconnecting the power and communications from the XIMV.
Disconnect the RTD from the XIMV.
Perform the continuity test on wires leading to the probe. Set the MM to 200 OHM or Continuity Audio.
Check continuity of first wire pair (typically red or black) by connecting one lead to each wire. Meter should read zero
or close to zero.
If there is continuity, skip to Step 7.
Verify the wiring at RTD head is correct.
- If the wiring at connection head is correct:
- The RTD is defective.
- Replace the probe.
Check the continuity of second wire pair (typically white) by connecting one lead to each wire. The meter should read
zero or close to zero.
Check the continuity of each wire (first pair either red or black as identified in step 4) to the probe or the shield.
- If there is continuity:
- The RTD is defective.
- Replace the probe.
Check the continuity of each second wire pair (white or as identified in step 7) to probe or shield.
- If there is continuity:
- The RTD is defective.
- Replace the probe.
Check the continuity of each first wire pair (as identified in Step 4) to each second wire pair (as identified in Step 7).
- If the Multi Meter does not read approximately 100 to 140 Ohms.
- RTD is defective.
- Replace the probe.
If the probe is still not functioning correctly, recheck wiring using supplied diagram. If no wiring error was found, see
section 6.2.6 RTD Current Source Test, page 123.
143 XFC G4 2103335 Rev AB