Daikin FTXB60C - Page 84

Refrigerant Diagram
76
6.5 Rotation pulse check on outdoor unit PCB
6.5.1 Turning speed pulse input on outdoor unit PCB check for (A)RXN25/35L, RXN25/35MV1 &
RXN25/35MV1B
a. Make sure control voltage of DC15V is being applied.
b. Make a turn of the fan motor with hand and make sure the pulse (0-15V) appears 4 times at pins
10 and 13.
S71
13
12
11
10
9
8
7
6
5
4
3
2
1
HV (Hall IC)
HU (Hall IC)
Phase W
15V
Free pin
Free pin
Phase V
Free pin
Free pin
Phase U
Free pin
Free pin
6.5.2 Rotation pulse check on outdoor unit PCB for RXN25/35MV1B9, ARXN25/35MV1B(7), RXK25/35A,
(A)RXN25/35N, RXC25/35A and all class 50/60 except (A)RXN50/60L, RXB50/60A/B
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation off and power off. Disconnect the connector 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 S71.
6. Check whether 4 pulses (0 ~ 15 VDC) are output at the pins 1 - 4 when the fan motor is rotated 1
turn by hand.
When the fuse is melted, check the outdoor fan motor for proper function.
If NG in step 2 : Defective PCB and replace the outdoor unit PCB.
If NG in step 4 : Defective Hall IC and replace the outdoor fan motor.
If OK in both steps 2 and 4,replace the outdoor unit PCB.
1
2
3
4
5
6
7
PCB
S71
Actual rotation pulse input (0 ~ 15 VDC)
320 VDC
Control voltage 15 VDC
Rotation command voltage (0 ~ 6.5 VDC)