Check No.11 - Outdoor Unit: Check For Power Transistor - Daikin ESIE13-02 Service Manual

Additional Checks for Troubleshooting
6.10

Check No.11 - Outdoor Unit: Check for Power Transistor

1
3
Power transistor
(on inverter PC
board)
4
5
Part 4 – Troubleshooting
Judgment according to the continuity check by using an analog tester:
1 Do not touch the charged area (high voltage) for 10 minutes after turning the power supply off.
2 If you must touch such an area, make sure that the power supply voltage of power transistor is 50 V
or less.
3 Disconnect the connector of the outdoor unit fan motor.
When the outdoor unit fan is rotating against a strong wind, the condenser is charged and electric
shock may result. Therefore, disconnect the connector from the outdoor unit fan motor after con-
firming that the outdoor unit fan has stopped.
4 Before measuring the continuity, disconnect the connection between compressor and power
transistor.
5 Measure the continuity in the following procedure.
[Judgment] Normal if the continuity check results in the following.
P — U
P — V
P — W
U — P
V — P
W — P
*
If there is continuity, the resistance should be the same as each phase.
*
If a digital tester is used for the measurement of continuity, ∞ and continuity may be reversed.
Continuity U — P
Continuity * V — P
Continuity W — P
∞
P — U
∞
P — V
∞
P — W
160
∞
∞
∞
Continuity
Continuity
*
Continuity
(S2678)
ESIE13-02