Daikin altherma 3 M Service Manual page 225

To perform an electrical check of the DC fan motor assembly
Problem solved?
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
1 First perform a mechanical check of the DC fan motor assembly, see
4
procedures" [ 224].
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
Confirm the rectifier voltage is below 10 V DC before proceeding, see
electrical hazards" [
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 1-2, 1-3, and 2-3 of the DC fan motor connector.
Result: All measurements MUST be 7.6 Ω±10% at 20°C.
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.
Are the measured resistance values
correct?
Yes
No
After all checking procedures listed above have been performed:
Is the problem solved?
Yes
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.
4
285].
Action
Perform a check of the main PCB, see
"Checking
Replace the DC fan motor, see
procedures" [
Action
No further actions required.
3 Components
|
"Checking
"To prevent
4
procedures" [ 181].
"Repair
4
226].
Service manual
225