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Chapter 2
Maintenance and Inspection
Troubleshoot the Unit
Symptom
Output is 0V DC and does not change.
Output is approximately -0.7V DC and does not change.
Output is approximately -22V DC and does not change.
40
Use the table below to troubleshoot problems with the unit.
Possible Cause
Power is not on.
Unit is not connected properly.
The driver is faulty.
The target is beyond the measurement range.
The sensor failed or the sensor cable is shorted or
disconnected.
The extension cable is shorted or disconnected.
There is a foreign object in the connector.
The driver is faulty.
The target is outside the possible measurement range.
The driver is faulty.
Rockwell Automation Publication ICM-UM004C-EN-E - February 2014
Recommended Action
Turn on the power.
Refer to Connect the Wiring on page 32
unit is wired correctly.
Replace the driver.
Refer to Set Gap Voltage on page 36
to adjust the gap.
Measure the resistance between the sensor connector,
and if not normal, replace the sensor.
Normal value:
Sensor coil resistance: Approx. 5.5 Ω
Sensor cable resistance: Approx. 0.25 Ω/m
Measure the resistance of the extension cable, and if it is
not normal, replace the extension cable.
Normal value:
Center conductor resistance: Approx. 0.25 Ω/m
Outer conductor resistance: 0 Ω
Center pin to outer conductor resistance: ∞Ω
Disconnect the connector, and remove foreign object in
the connector.
Replace the driver.
Refer to Set Gap Voltage on page 36
to adjust the gap.
Replace the driver.
to make sure the
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