Rotation Pulse Check On The Outdoor Unit Pcb - Daikin FTKN09NMVJU Service Manual

Check
5.8

Rotation Pulse Check on the Outdoor Unit PCB

Check No.16 Make sure that the voltage of 320 + 100 V ~ 320 - 50 V is applied.
1. Set operation off and power off. Disconnect the connector S70 or S71.
2. Check that the voltage between the pins 4 - 7 is 320 VDC.
3. Check that the control voltage between the pins 3 - 4 is 15 VDC.
4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 6.5 VDC.
5. Keep operation off and power off. Connect the connector S70 or S71.
6. Check whether 4 rotation pulses (0 ~ 15 VDC) are input at the pins 1 - 4 when the fan motor is
When the fuse is melted, check the outdoor fan motor for proper function.
97
rotated 1 turn by hand.
If NG in step 2 → Defective PCB
If NG in step 4 → Defective Hall IC → Replace the outdoor fan motor.
If OK in both steps 2 and 4
PCB
S70 or S71
1
2
3
4
5
6
7
→ Replace the outdoor unit PCB (main PCB).
→ Replace the outdoor unit PCB (main PCB).
Actual rotation pulse input (0 ~ 15 VDC)
Rotation command voltage (0 ~ 6.5 VDC)
Control voltage 15 VDC
320 VDC
SiUS041501E
(R20507)
Service Diagnosis