Daikin Emura RXJ20A5V1B Service Manual page 135

RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
INFORMATION
Check the DC fan motor power supply (voltage) circuit on the PCB.
2 Turn ON the power of the unit.
3 Activate Cooling or Heating operation via the user interface.
4 Check the functioning of the outdoor unit fan.
Outdoor unit fan ...
Rotates continuously (without
interruption)
Does not rotate or rotates for a short
time
5 Turn OFF the unit via the user interface.
6 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.
7 Check that the DC fan motor connector is properly connected to the PCB.
8 Unplug the DC fan motor connector and measure the resistance between the
pins 1-3, 1-5, and 3-5 of the DC fan motor connector.
Result: All measurements MUST be 51.9~57.3 Ω.
INFORMATION
Winding resistance values above are given for reference. You should NOT be reading
a value in kΩ or a short‑circuit. Make sure that the propeller fan blade does NOT
rotate, as this could affect resistance measurements.
9 Set the Megger voltage to 500 V DC or 1000 V DC.
10 Measure the insulation resistance for the motor terminals. Measurements
between each phase and fan motor body (e.g. axle) MUST be >1000 MΩ.
4
|
Action
DC fan motor assembly is OK. Return to
the troubleshooting of the specific error
and continue with the next procedure.
Continue with the next step.
Components
Service manual
135