Outdoor Fan Motor Check - Daikin FTKM-U Series Service Manual

SiMX042215E
5.7

Outdoor Fan Motor Check

Check No.16  12/18 class
Check if the sinusoidal voltage is generated between pins 1 - 3 and 3 - 5 when the fan motor is
manually rotated once.
 24 class
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation OFF and power OFF. Disconnect the connector S70.
2. Check that the voltage between the pins 4 - 7 is 320 VDC.
3. Check that the control voltage between the pins 4 - 3 is 15 VDC.
4. Check that the rotation command voltage between the pins 4 - 2 is 0 ~ 6.5 VDC.
5. Keep operation OFF and power OFF. Connect the connector S70.
6. Check whether 4 rotation pulses (0 ~ 15 VDC) are input at the pins 4 - 1 when the fan
When the fuse is melted, check the outdoor fan motor for proper function.
If NG in step 2  Defective PCB  Replace the outdoor unit PCB (main PCB).
If NG in step 4  Defective Hall IC  Replace the outdoor fan motor.
If OK in both steps 2 and 4  Replace the outdoor unit PCB (main PCB).
Part 6 Service Diagnosis
motor is rotated 1 turn by hand.
PCB
S70
1
2
3
4
5
6
7
PCB
S71
5
3
1
Actual rotation pulse input (0 ~ 15 VDC)
Rotation command voltage (0 ~ 6.5 VDC)
Control voltage 15 VDC
320 VDC
Phase U
Phase V
Phase W
(R25288)
Check
R6000709
95