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VMIFB202
Troubleshooting Guide Alarm motor protection
Defective or incorrectly set motor protection
Action:
Use a hook-on ammeter to establish when the motor protection deploys, check what the motor protection is set to. Compare with
table.
To ensure that the alarm deploys ”mechanically” one can twin the red and the white cable that are marked 95-96 on the motor
protection (see image).
If the motor protection alarm disappears one knows that the motor protection is deploying
Defective or incorrectly set motor protection
Action:
Check the supply to the motor protection/soft-starter/compressor. Measure so that one can see where the supply disappears, try
pulling at the cables to see if there is any play.
If a cable is damaged, replace it.
Defective compressor
Action:
Check the Ampere level of all phases after the soft starter, deviation should not be more than approx 12% between the three phases.
If it is suspected that the compressor is about to break down feel the compressor to see if it is hot around the motor or whether the
discharge pipe temperatures are abnormally high.
Measure the resistance between the linings so that there is no open-circuit between the linings, and that there is no contact between
phase and ground.
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