GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
189
Attachment: How to check whether the IPM module is damaged
a. Preparation: Find a digital multi-meter and switch it to the diode. Remove U, V and W cables of
the compressor from the drive board two minutes after the system is powered off. Make sure that it is
tested at least two minutes after the system is powered off.
b. Method: Use the black probe of the multi-meter to touch the place marked by P in the follow
picture and the red probe to touch places marked by U, V and W respectively and record readings of the
multi-meter. Use the red probe to touch the place marked by N and black probe to touch places marked
by U, V and W respectively and record readings of the multi-meter.
c. Analyzing: If the reading ranges between 0.3 V and 0.7 V in the above-mentioned six scenarios,
the IPM module is normal. If the reading is 0 in one or multiple scenarios, the IPM module is damaged.
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