DC Inverter Multi
VRF Service Manual
183
2) Solution to the Compressor Drive Board and IPM Module Protection Error
Compressor Drive Board and
IPM Module Protection
Check if the compressor
runs or not before the IPM module
comes into protection
NO
YES
NO
Replace the compressor
drive board and see if it will still
come into protection
YES
Replace the broken-down
compressor
YES
It is finished
NO
YES
When the compressor comes
into protection after running for a
period of time, then check if the
screws of the IPM module are
tightened.
Check if the connection of the
power cards of the main board
and the drive board is in good
condition
If the screws of the IPM module
are already tightened, power
the unit on again and see if it will
still come into protection
YES
Method to test if the IPM Module IS Shortcut:
1) Preparation before check: prepare a universal meter which is
turned to the diode option, and then remove the wires U, V, W
from the drive board of the compressor which has been powered
off for one minute.
2) The test comes into two steps
Step 1: put the black probe of the universal meter on the
place P and the red on the wiring terminal U, V, W respectively
to measure the voltage between UP, VP, WP.
Step 1: put the red probe of the universal meter on the place
N and the black on the wiring terminal U, V, W respectively to
measure the voltage between NU, NV, NW.
3) If the measured valves between UP, VP, WP, NU, NV, NW
are all among 0.3V~0.7V, it indicates the IPM is normal; if there is any value which is 0V, it indicates that the IPM
module is damaged.
UV
W
P
N
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