Daikin VRVIII-S Service Manual page 240

SiBE34-703
Power module checking
When using the digital type of multiple tester, make measurement in diode check mode.
Tester terminal
+
C+
U
V
W
U
V
W
C-
The following abnormalities are also doubted besides the PC board abnormality.
1 Faulty compressor (ground fault, ground leakage)
1 Faulty fan motor (ground leakage)
Appendix
Method of Replacing the Inverter's Power Transistors Modules
Criterion
-
U Not less than 0.3V
(including ∞)*
V
W
C- Not less than 0.3V
(including ∞)*
C+ 0.3 to 0.7V
(including ∞)*
U 0.3 to 0.7V
(including ∞)*
V
W
*There needs to be none of each value variation.
Remark
It may take time to
determine the voltage
due to capacitor
charge or else.
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