Danfoss Heat Pump Troubleshooting Guide download pdf (Page 11)

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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Danfoss Heat Pump Troubleshooting Guide Page 11