A/A DC INVERTER U-MATCH AIR CONDITIONERS MAINTENANCE
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Method of Testing IPM Module Short Circuit:
1. Preparation before test: prepare a universal meter and turn to its diode option, and then remove the wires U,
V, W of the compressor after it is powered off for one minute.
2. Testing Steps
Step 1: put the black probe on the place P and the red one on the wiring terminal U, V, W respectively as shown in
the following figure to measure the voltage between UP, VP and WP.
Step 2: put the red probe on the place N and the black one on the wiring terminal U, V, W respectively as shown in
the following figure to measure the voltage between NU, NV and NW.
3. If the measured voltages between UP, VP, WP, NU, NV, NV are all among 0.3V
～0.7V, then it indicates the
IPM module is normal; If any measured valve is 0, it indicates the IMP is damaged.
N
P
W
V U
N
P
U
W
U
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