Mitsubishi Electric CITY MULTI PUMY-P200YKM3, Руководство по обслуживанию

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OCH791 _82
8-7-2. Check method of DC fan motor (fan motor/outdoor multi controller circuit
board)
■ Precaution
• 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.)
■
Self-check
Symptom: The outdoor fan cannot rotate.
Yes
Yes
Yes
Yes
No
Fail
Fail
OK
OK
No
No
Fuse check
Check the fuse (F500) on outdoor
multi controller circuit board.
Wiring contact check
Contact of fan motor connector
(CNF1, 2)
Power supply check (Remove the connector (CNF1, 2))
While the breaker is OFF, disconnect the compressor wirings (U/V/W) from the outdoor power circuit board.
While the breaker is OFF, disconnect the fan motor connector CNF1, 2.
When 5 minutes have passed since turning ON the breaker, turn SW7-1 ON.
Check the voltage of the outdoor multi controller circuit board.
Measure the voltage in the outdoor controller circuit board.
TEST POINT 1: V
DC
(between 1 (+) and 4 (−) of the fan connector): 310–350 V DC (three phase)
: V
DC
(between 1 (+) and 4 (−) of the fan connector): 310–340 V DC (when PAM stops),
380 V DC (when PAM is operating) (single phase)
TEST POINT 2: V
CC
(between 5 (+) and 4 (−) of the fan connector): V
CC
15 V DC
TEST POINT 3: V
CC
(between 6 (+) and 4 (−) of the fan connector): V
CC
0–6.5 V DC
Did the fuse blow?
Is there contact failure?
Is the voltage normal?
Complete.
Disconnect the FAN motor
connector and measure the
resistance of connector pins.
Refer to “How to check the
parts”.
Is the fan motor normal?
Yes
No
Replace the outdoor multi
controller circuit board (MULTI.B.).
Replace the outdoor multi controller circuit
board (MULTI.B.) and the faulty fan motor.
Correct the wiring.
Replace the faulty fan motor.
Replace the defective fan
motor.
Replace the outdoor multi
controller circuit board.
Replace the outdoor multi
controller circuit board.
Complete.
Check the operation of fan.
Check the operation.
Note:
• Turn SW7-1 OFF after the troubleshooting completes.
• The fan sometimes starts on-off cycle operation during low load operation or cooling at low outside temperature.
It is not abnormal; the operation ensures reliability of the product.