DAMA-SM-21-003
Actuator Check
Service Diagnosis
91
5.11 Power Module Check
Check No.22
Check to make sure that the voltage between (+) and (–) of the power module is approximately
0 V before checking.
Disconnect the compressor (X12A)/fan motor (X11A) harness connector from the outdoor
unit PCB. To disengage the connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the (+) or (–) terminal of the
power module and the U, V, or W terminal of the compressor (X12A)/fan motor (X11A) with
a multimeter. Evaluate the measurement results referring to the following table.
Diagram Power Module Check for CTX07/09/12
Compressor
Positive terminal (+) of
digital multimeter
Power module
(+)
UVW
Power module
(–)
UVW
Negative terminal (–) of
digital multimeter
UVW
Power module
(+)
UVW
Power module
(–)
Resistance is OK.
several k
Ω
~ several M
Ω
Resistance is NG.
0
Ω
or
∞
Fan motor
Positive terminal (+) of
digital multimeter
Power module
(+)
UVW
Power module
(–)
UVW
Negative terminal (–) of
digital multimeter
UVW
Power module
(+)
UVW
Power module
(–)
Resistance is OK.
several k
Ω
~ several M
Ω
Resistance is NG.
0
Ω
or
∞
Compressor
Pin 24: +
Pin 23: U
Fan motor
Pin 28: +
Pin 31: U
Pin 35: V
Pin 22: V
Pin 21: W
Pin 20: -
Pin 37: W
Pin 40: -
DAMA-SM-21-003 -Inverter Multi Split-CTX Series.book Page 91 Wednesday, September 1, 2021 5:44 PM
Summary of Contents for CTX Series
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