Daikin FTXA20A Service Manual page 96

2 | Components
To perform a power module check
Service manual
96
Prerequisite: First check the rectifier voltage of the main PCB, see
4
procedures" [ 91].
Prerequisite: Stop the unit operation via the user interface.
1 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
Power module IPM1 for compressor
1 Disconnect the compressor connector from the main PCB.
2 Check the power module IPM1 in reference with the image and the table
below.
c b a
d
e
a U
b V
c W
d DC+
e DC–
INFORMATION
When measuring on the front of the main PCB, make sure to locally remove the
protective varnish with the test leads of the multi meter.
VDC Com
U DC+
V DC+
W DC+
DC– U
DC– V
Ref VDC
0.501 V DC+
0.501 V DC+
0.501 V DC+
0.501 V U
0.501 V V
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
"Checking
Com Ref
U O.L
V O.L
W O.L
DC– O.L
DC– O.L
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05