Check
SiBE05-722EE
108
Service Diagnosis
5.8
Rotation Pulse Check on the Outdoor Unit PCB
Check No.16
RK(X)S25/35E2V1B, RK(X)S25/35G2V1B, RXS25/35L3V1B
Make sure that the voltage of 320 ± 30 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 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
→
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).
RK(X)S25/35G2V1B9, RXS25/35J2V1B, RXS25K3V1B, RXS35K2V1B, RXS25/35L2V1B
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 -
12, 10 - 13, when the fan motor is manually rotated once.
1
2
3
4
5
6
7
320 VDC
(R20507)
S70 or S71
PCB
Actual rotation pulse input (0 ~ 15 VDC)
Rotation command voltage (0 ~ 6.5 VDC)
Control voltage 15 VDC
13
12
11
10
9
8
7
6
5
4
3
2
1
S70
Phase U
Control voltage 15 VDC
Phase V
Phase W
HU (Hall IC)
HV (Hall IC)
Free pin
Free pin
Free pin
Free pin
Free pin
Free pin
(R19663)