Troubleshooting Guide
Relay driver outputs
SKF Multilog On-Line System IMx-S 5 - 7
User Manual – Revision S
the cable integrity. If the sensor being simulated is an IMx powered 2-wire
device, consider whether the signal generator can dissipate the worst-case
power without damage, and if necessary or in doubt, decouple it from the
IMx-S by a series capacitor.
YES: Verify that the signal has an appropriate voltage range and pulse height to
allow the IMx-S to trigger
. Check the software is correctly configured for this
digital input. If no root cause is identified, contact TSG for further advice.
If a speed hael oks ut gies a ioet speed, hek that the oet number of
pulses per rev, have been configured in the software.
Relay driver outputs
1. Identify which relay driver output of the IMx-S, is being used for the alarm under
investigation, the expected alarm state and consequently whether it is expected
that the relay coil is currently being energised or not.
2. Is it expected that the coil should be energised?
NO: Skip to step 4.
YES: Measure the DC voltage at the relay coil terminals, using a digital voltmeter.
a. Is the measured voltage 12 V DC, as expected?
YES: Skip to step 3.
NO: Disconnect the relay wiring at the IMx-S and recheck the voltage, across those
terminals.
b. Is the measured voltage now 12 V DC, as expected?
YES: Double check that the relay is compatible with the IMx-S, especially that the
relay current requirement is within its capability, considering also the total of
all relays being used.
Otherwise, a relay or cable fault is indicated.
NO: Check again that the correct relay output is being tested and that the
configuration is correct. If so, the test suggests a fault in the IMx device,
contact TSG for further advice.
3. Disconnect the relay output wiring and using a DMM, measure resistance across the
relay output terminals. Observe the reading and disconnect either of the
connections to the relay coil. Has the reading changed (from an open to a low
resistance or vice versa)?
NO: A relay fault is indicated.
YES: The IMx-S and relay sub-system seems as expected. Check the downstream
system components: that the correct relay output contacts are being used, the
power supply on the relay contact side, the detetig deie, etc.
4. Measure the DC voltage at the relay coil terminals, using a digital voltmeter. Is it
approximately 12 V DC?
YES: Check again that the correct relay output is being tested and that the
configuration is correct. Check also that this relay is wired to the correct IMx-S,
relay driver output.
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