Daikin FTXA20A, Service Manual

Page: 50 / 192

2 | Components
Service manual
50
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
V U
W
U Wire terminal U
V Wire terminal V
W Wire terminal W
7 Install the compressor insulation.
8 Turn ON the power using the respective circuit breaker.
9 Start the unit operation via the user interface.
10 Wait for – or create condition to operate the compressor.
11 Once the compressor operates, measure the U-V-W inverter voltages. All
measurements MUST be the same.
Inverter voltage measurements are
correct? Action
Yes Continue with the next step.
No Perform a check of the appropriate PCB,
see
"2 Components" [
4
40].
12 Measure the current in each phase U, V and W while compressor is operating.
All measurements MUST be the same.
Compressor motor winding current
measurements are correct? Action
Yes Perform an insulation check of the
compressor, see
"2.2.1 Checking
procedures" [
4
46].
No Preventively replace the compressor,
see
"2.2.2 Repair procedures" [
4
52].
To perform an insulation check of the compressor
Prerequisite: First perform an electrical check of the compressor, see
"2.2.1 Checking procedures" [
4
46].
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.