Mitsubishi Electric PUMY-HP36NKMU1, Техническое и сервисное руководство

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OCH733
Check code
Abnormal points and detection methods Causes and checkpoints
If any of following symptoms are detected;
●Decrease of DC bus voltage to 200 V(\/model), 350 V (Y model)
●Increase of DC bus voltage to 400 V (V model), 760 V (Y model)
●DC bus voltage stays at 310V or less for consecutive 30 seconds when
the operational frequency is over 20 Hz.
● When any of following conditions is satisfied while the detections value
of primary current is 0.1A or less.
1. The operational frequency is 40Hz or more.
2. The compressor current is 6A or more.
Decrease/increase of power supply voltage
2
L1 open-phase (Y model only)
Primary current sensor failure
Disconnection of compressor wiring
Malfunction of 52C relay
Defective outdoor power circuit board
Malfunction of 52C relay driving circuit on outdoor
multi controller circuit board
Disconnection of CN5 (Y model only)
Disconnection of CN2
0
Malfunction of primary current detecting circuit on
outdoor power circuit board
1
Malfunction of resistor connected to 52C relay on
outdoor power circuit board (Y model only)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
vzv
V model: single phase model
Y model: three phase four wire model
Chart 1 of 2
Voltage shortage /Overvoltage/PAM error/L1 open phase/
Primary current sensor error/Power synchronization signal error
4220
(U9)
The black square (■) indicates a switch position.
6
Continue to the next page.
*Refer to "8-7. HOW TO CHECK THE PARTS".
3
7,8
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Is there any abnormality on wirings?
Which sub code is displayed?
Does the DC bus voltage rise to
approx. 380 V at PAM driving?
Is there any abnormality on
PAM wirings or reacor?
Is there any abnormality at the
PAM circuit on the outdoor power
circuit board?*
Is there any abnormality at
the PAM power supply circuit or
52C relay drive signal circuit on
the outdoor multi controller?*
a. L 1 open-phase (Y model only)
b. Disconnection of compressor wiring
c. Disconnection of terminal block for
power supply
d. Disconnection of noise filter circuit board
e. Disconnection of power circuit board
f. Disconnection of CN52C (V model only)
g. Disconnection of CN5 (Y model only)
h. Disconnection of CN2
Check the power supply facility.
Correct the wiring.
Replace the reactor if it is broken.
Replace the outdoor power circuit board
(defective outdoor power board).
Replace the outdoor multi controller
circiut board.Breakage of wiring for PAM
controlling power supply, and such.
Replace the outdoor power circuit board
(defective outdoor power circuit board).
ON
OFF
1 2 3 4 5 6 7 8
SW1 Setting
Display on LED1,2
1
2 3 4 5 6 7 8
The sub codes are
displayed by an operation
of SW1 on the outdoor
controller board.
The sub codes are
displayed by an operation
of SW1 on the outdoor
controller board.
3: PAM error
6: Input sensor trouble
7: Shortage voltage trouble
8: Overvoltage trouble
3: PAM error
6: Input sensor trouble
7: Shortage voltage trouble
8: Overvoltage trouble