Treatment Of Fan Motor Related Troubles - Mitsubishi Electric PUHY-200YMF-C Service Handbook

5) Treatment of Fan Motor Related Troubles

Condition
1 It won't run for 20 minutes
or longer when the AK
value is 10%. (When
the MAIN board's SW1 is
set as shown below, the
AK value is displayed by
the service LED.)
SW1 = 1110001000
2 The fan motor's vibration
is great.
Possible Cause
1) The power supply voltage
is abnormal.
2) Wiring is faulty.
3) The motor is faulty.
4) A fuse (F1, F2, F3) is
defective.
5) The transformer (T01) is
defective.
6) The circuit board is faulty.
Check Method and Treatment
If there is an open phase condition before the breaker, after
the breaker or at the power supply terminal blocks TB1A or
TB1B, correct the connections.
If the power supply voltage deviates from the specified
range, connect the specified power supply.
For the following wiring, 1 check the connections, 2 check
the contact at the connectors, 3 check the tightening torque
at parts where screws are tightened, 4 check the wiring
polarity, 5 check for a broken wire and 6 check for ground-
ing.
TB1A~NF~TB1B~CNTR1~T01~CNTR
TB1B~CNPOW, CNFAN~CN04~CNMF
CNFC1~CNFC2
* Check if the wiring polarity is as shown on the wiring
diagram plate.
Measure the resistance of the motor's coils: 20~60Ω
Measure the motor's insulation resistance with a megger:
10 MΩ (DC 500 V) or more
If a fuse is defective, replace it.
Judge that T01 is faulty. Go to "Individual Parts Failure
Judgment Methods."
If none of the items in 1) to 5) is applicable, and the trouble
reappears even after the power is switched on again,
replace the circuit board using the following procedure.
(When replacing the circuit board, be sure to connect the
connectors and ground wire, etc. securely.)
1 Replace the FANCON board only. If it recovers, the
FANCON board is defective.
2 Replace the FANCON board and replace the MAIN
board. If it recovers, the MAIN board is defective.
3 If the trouble continues even after 1 and 2 above, then
both boards are defective.
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