Service Manual

57
OCH636B
FAN MOTOR (MF1)
Inverter
driver
Ground
<- power supply (inverter drive)
<- power supply (gate drive)
-> rotation signal
<- control voltage
7
6
5
4
-
-
1
3
-
1
CNF1
CNDCF5
15 V DC
0-6.5 V DC
0-15 V DC pulse
C5E
Motor
TESTS POINT ① V
A36/A42 only
DC
TESTS POINT ② Vcc
CHECK POINT
+
280-380 V DC
TESTS POINT ③ Vsp
PC5D
C5B
TESTS POINT ④ V
FG
C5D
TESTS POINT ③ Vsp
TESTS POINT ④ V
FG
TESTS POINT ② Vcc
CHECK POINT
FAN MOTOR (MF2)
Inverter
driver
Ground
<- power supply (inverter drive)
<- power supply (gate drive)
-> rotation signal
<- control voltage
7
6
5
4
-
-
1
CNF2
0-6.5 V DC
0-15 V DC pulse
Motor
TESTS POINT ① V
DC
TESTS POINT ③ Vsp
PC5C
C5A
TESTS POINT ④ V
FG
TESTS POINT ③ Vsp
TESTS POINT ④ V
FG
TESTS POINT ② Vcc
CHECK POINT
3
-
1
CNDC
Outdoor controller circuit board
Power circuit board
· The inverter control P.C. board is built in the fan motor of this outdoor unit.
· When F5 that is on controller board is opened, change the fan motor and outdoor controller board at the same time (F5 is
impossible to change).
· It is abnormal when the abnormality is detected from either both fan motors or only one side.
10-6-5. Check method of DC fan motor (fan motor/outdoor controller circuit board)
1 Notes
· High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNF1, 2) for the motor with the power supply on.
(It causes trouble of the outdoor multi controller circuit board and fan motor.)
2 Self check
Symptom: The outdoor fan cannot rotate.
Yes
Yes
Yes
Yes
No
Fail
Fail
OK
OK
No
No
Wiring contact check
Contact of fan motor connector (CNF1, 2)
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit board.
TEST POINT 1: V
DC
(between 1 (+) and 4 (−) of the fan connector): 280–340 VDC (when PFC stops), 380 VDC (when PFC is operating)TEST
POINT 2: V
CC
(between 5 (+) and 4 (−) of the fan connector): V
CC
15 VDC
Did the F5 open?
Is there contact failure?
Is the voltage normal?
Check the operation.
Complete.
Complete.
Check the operation of fan.
Disconnect the FAN motor
connector and measure the
resistance of connector pins.
Refer to “10-6. HOW TO
CHECK THE PARTS”.
Is the fan motor normal?
Yes
No
Replace the outdoor controller
circuit board (C.B.).
Replace the outdoor controller circuit board
(C.B.) and the defective fan motor.
Correct the wiring.
Replace the defective fan motor.
Replace the defective fan motor.
Replace the outdoor multi
controller circuit board.
Replace the outdoor controller circuit board.
Fuse check
Check the fuse (F5) on outdoor controller circuit board.