MXZ-SM36NAMHZ Service Manual

77
OCH789
Check code
Chart 1 of 2
4220
(U9)
Voltage shortage /Overvoltage/PAM error/L1 open phase/
Primary current sensor error/Power synchronization signal error
Abnormal points and detection methods Causes and checkpoints
If any of following symptoms are detected;
● Decrease of DC bus voltage to 200 V (Single-phase), 350 V (3-phase)
● Increase of DC bus voltage to 400 V (Single-phase), 760 V (3-phase)
● DC bus voltage stays at 310 V 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 0.1 A or less.
1. The operational frequency is 40 Hz or more.
2. The compressor current is 6 A or more.
Decrease/increase of power supply voltage
2
L1 open-phase (3-phase 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 (3-phase only)
Disconnection of CN2
Malfunction of primary current detecting circuit on
outdoor power circuit board
Malfunction of resistor connected to 52C relay on
outdoor power circuit board (3-phase only)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
vzv
The black square (■) indicates a switch position.
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 reactor?
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 (3-phase only)
b. Disconnection of compressor wiring
c. Disconnection of terminal block for power
supply
d. Disconnection of noise lter circuit board
e. Disconnection of power circuit board
f. Disconnection of CN52C (Single-phase only)
g. Disconnection of CN5 (3-phase 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
circuit board (breakage of wiring for PAM
controlling power supply).
Replace the outdoor power circuit board
(defective outdoor power circuit board).
6
3
7,8
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.
Continue to the next page.
*Refer to "8-7. HOW TO CHECK THE PARTS".
3: PAM error3: PAM error
6: Input sensor trouble6: Input sensor trouble
7: Shortage voltage trouble7: Shortage voltage trouble
8: Overvoltage trouble8: Overvoltage trouble
3: PAM error
6: Input sensor trouble
7: Shortage voltage trouble
8: Overvoltage trouble
ON
OFF
1 2 3 4 5 6 7 8
SW1 Setting
Display on LED1,2
1
2 3 4 5 6 7 8
Single phase: single phase model
3-phase: three phase for wire model