Troubleshooting
Page 86
8.3 IPM Continuity Check
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
1. Turn off outdoor unit and disconnect power supply.
2. Discharge electrolytic capacitors and ensure all energy-storage unit has been discharged.
3. Disassemble outdoor PCB or disassemble IPM board.
4. Measure the resistance value between P and U(V, W, N); U(V, W) and N.
Digital tester Resistance value Digital tester Resistance value
(+)Red (-)Black
∞
(Several MΩ)
(+)Red (-)Black
∞
(Several MΩ)
P
N U
N
U V
V W
W -
Or test the conductivity of IPM with diode mode.
Needle-type Tester
Normal Value
Needle-type Tester
Normal Value
Red Black Red Black
P
U
Open-circuit N
U
0.3-0.5V
V V
W W
Needle-type Tester
Normal Value
Needle-type Tester
Normal Value
Black Red Black Red
P
U
0.3-0.5V N
U
Open-circuit
V V
W W
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