SKF Multilog IMx-S Series User Manual page 32

Troubleshooting Guide
Component Check
3. Is the voltage within the normal working range?
4. Does the fault remain after changing the sensor?
5. Is the voltage close to zero (typical < ±0.5 V)?
6. Did the voltage rise to normal open circuit voltage?
7. Is the sensor a standard type?
8. The fault is in the sensor cable or the sensor. Go out to the sensor, and
6 - 4
YES: The cabling to the sensor is probably Ok, and the sensor electronics have
normal input impedance. If the sensor signal is still not perceived to be normal,
one should try changing the sensor.
NO: Continue to step 5.
YES: The fault may be in the analogue input section of the IMx-S unit. Contact
SKF Condition Monitoring Center Luleå for service and further information.
NO: Sensor fault. The sensor is defective and must be replaced.
YES: There is probably a short circuit in the cable, or the sensor is defective.
First, verify that the voltage rises to normal open circuit voltage when one of
the sensor cable poles is disconnected from the terminal block of the IMx-S
unit.
NO: Continue to step 9.
YES: Continue to step 8.
NO: The sensor is not receiving power, continue below.
YES: These are powered internally from the IMx-S unit. If the IMx-S unit does
not supply open circuit voltage with input open, then the IMx-S input is
probably damaged, or the input is not configured to supply a power feed to the
sensor. Verify the DIP switching. If DIP switching is not the problem, contact
SKF Condition Monitoring Center Luleå.
disconnect the cable at this end. Reconnect the cable on the IMx-S terminal
block, and again measure the voltage over these two poles. Does the short
circuit remain?
YES: The sensor cable (or contact) has a short circuit. Repair the cabling.
NO: The sensor is defective. Replace the sensor.
SKF Multilog On-Line System IMx-S
User Manual