Rotation Pulse Check On The Outdoor Unit Pcb - Daikin FTX-N Series Service Manual

Check
8.8

Rotation Pulse Check on the Outdoor Unit PCB

Check No.16
Make sure that the voltage is within 320
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 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 or S71.
6. Check whether 4 rotation pulses (0 ~ 15 VDC) are input at the pins 4 - 1 when the fan motor is
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).
189
rotated 1 turn by hand.
PCB
S70 or S71
1
2
3
4
5
6
7
+ 100 VDC.
- 50
Actual rotation pulse input (0 ~ 15 VDC)
Rotation command voltage (0 ~ 6.5 VDC)
Control voltage 15 VDC
320 VDC
SiUS091601EA
(R20507)
Part 6 Service Diagnosis