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Components
Service manual
149
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
5
Confirm via the service monitoring tool that the DC fan motor assembly
receives an ON signal.
6
Turn OFF the unit via the user interface.
7
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.
8
Disconnect the DC fan motor connector S70 and measure the resistance on
the connector pins shown below. The measured resistance MUST be:
VDC
Comm
Resistance
1
4
>1 MΩ
2
4
>100 kΩ
3
4
>100 Ω
7
4
>100 kΩ
INFORMATION
The measured resistance values may deviate from the listed values due to instability
during the measurements.
DC fan motor resistance measurements
are correct?
Action
Yes
Continue with the next step.
No
Replace the DC fan motor, see
9
Turn ON the power of the unit.
10
With the DC fan motor connector S70 disconnected from the main PCB,
measure the voltage on the connector pins 4-7 (= fan motor power supply) on
the main PCB.
Result:
The voltage MUST be:
Unit
Voltage
Class 42~60 + ARXM71R
200~390 V DC
RXM71R
342~408 V DC
11
Measure the voltage on the connector pins 4-3 (= fan motor control) on the
main PCB.
Result:
The voltage MUST be 15±10% V DC.
Are both measured voltages correct?
Action
Yes
Continue with the next step.
No
Perform a check of the main PCB, see
135].
12
Measure the voltage on the DC fan motor connector S70 pins 2-4 (= rotation
command) on the PCB.
Result:
The measured voltage should be 0~7.5 V DC. It should NOT be 0 V DC.