Mitsubishi PUMY-P60NKMU - PAM Error; Power Synchronization Signal Error; T Open-Phase; Voltage Shortage;Overvoltage

Check code
Abnormal points and detection methods Causes and check points
Abnormal if any of following symptoms are detected;
●Decrease of DC bus voltage to 200V
●Increase of DC bus voltage to 400V
●Decrease of primary current
(The detection is active only when the operational frequency is 40Hz or
more, or the compressor current is 5A or more.)
Decrease/increase of power supply voltage, or T
open-phase
Disconnection of compressor wiring
Malfunction of 52C
Disconnection or contact failure of CN52C
Defective outdoor power board
Malfunction of 52C driving circuit on outdoor
controller board
Disconnection of CN5
Disconnection of CN2
Malfunction of primary current detecting circuit on
outdoor power board
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
4220
Voltage shortage/Overvoltage/PAM error/T open-phase/
Power synchronization signal error
The black square (■) indicates a switch position.
Chart 1 of 2
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
6
1
7,8
Is there any abnormality on wirings?
Which sub code is displayed?
Does a DC bus voltage raise to
approx. 350V at PAM driving?
Is there any abnormality on
PAM wirings?
Is there any abnormality at the
PAM circuit on the outdoor power
board?
Is there any abnormality at
the PAM power supply circuit on the
controller board?
a. T open-phase
b. Disconnection of compressor wiring
c. Disconnection of CN52C
d. Disconnection of CN5
e. Disconnection of CN2
The sub codes are
The sub codes are
displayed by an operation
displayed by an operation
of SW1 on the outdoor
of SW1 on the outdoor
controller board.
controller board.
The sub codes are
displayed by an operation
of SW1 on the outdoor
controller board.
Check the power supply facility.
Correct the wiring.
Replace the outdoor power board
(Defective outdoor power board).
Replace the outdoor controller board.
Breakage of wiring for PAM controlling
power supply, and such.
PAM error.
ON
OFF
12345678
SW1 Setting
Display on LED1,2
1
2 3 4 5 6 7 8
3: PAM error
3: PAM error
6: Input sensor trouble
6: Input sensor trouble
7: Shortage voltage trouble
7: Shortage voltage trouble
8: Overvoltage trouble
8: Overvoltage trouble
3: PAM error
6: Input sensor trouble
7: Shortage voltage trouble
8: Overvoltage trouble
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OCH502C