Gree GMV5 Series Service Manual page 168

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Attachment: How to check whether the IPM module is damaged
1. 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.
2. 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.
3. 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.
(4) Variable-frequency compressor drive board IPM over-temperature fault (ODU fault P8)
P8
Yes
Check if the fault
Replace the
occurs when the
compressor's drive
system is powered on.
board.
No
Screw the IPM module
No properly and apply
Check if the IPM module is
thermal gel on the
screwed well and thermal gel
surface.
is applied on the surface.
Complete
165