Rotation Pulse Check On The Outdoor Unit Pcb - Daikin FTXS20G2V1B Service Manual

SiENBE04-808_A

5.1.12 Rotation Pulse Check on the Outdoor Unit PCB

Check No.15 RK(X)S20-50G2V1B, ARXS20-50G2V1B
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 3 - 4 is 15 VDC.
4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 15 VDC.
5. Keep operation off and power off. Connect the connector S70.
6. Check whether 2 pulses (0 ~ 15 VDC) are output at the pins 1 - 4 when the fan motor is
When the fuse is melted, check the outdoor fan motor for proper function.
RK(X)S20-35G2V1B9, ARXS20-35G3V1B
1. Check that the voltage between the pins 10 - 11 is 15 VDC.
2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 -
Service Diagnosis
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 → Replace the outdoor unit PCB.
PCB
S70
1
2
3
4
5
6
7
12, 10 - 13, when the fan motor is manually rotated once.
13
12
11
10
9
8
7
6
5
4
3
2
1
→ Replace the outdoor unit PCB.
Actual rotation pulse output (0 ~ 15VDC)
Rotation command pulse input (0 ~ 15VDC)
15 VDC
320 VDC
S70
HV (Hall IC)
HU (Hall IC)
15 VDC
Free pin
Free pin
Phase W
Free pin
Free pin
Phase V
Free pin
Free pin
Phase U
(R10811)
(R11907)
Check
152