Mitsubishi Electric PUZ-HWM140VHA Service Manual page 24

Check Code Abnormal points and detection method
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
Detailed
codes
Refer to "9-9. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
Overvoltage error
• Increase in DC bus voltage to
HWM140V: 430 V
HWM140Y: 760 V
01
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
HWM140V: 200 V
HWM140Y: 400 V
02
Input current sensor error/
L1-phase open error
• Decrease in input current
through outdoor unit to 0.1 A
only if operation frequency is
more than or equal to 40 Hz
U9
or compressor current is more
than or equal to 6 A.
04
Abnormal power synchronous
signal
• No input of power synchronous
signal to power circuit board
• Power synchronous signal
of 44 Hz or less, or 65 Hz or
08
more is detected on power
circuit board.
PFC error (Overvoltage/
Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowing:
a) Increase in DC bus voltage
to 460V
b) Decrease in PFC control
10
voltage to 12 VDC or lower
c) Increase in input current to
74 A peak
OCH748
Case
1 Abnormal increase in power source
voltage
2 Disconnection of compressor wiring
3 Defective outdoor power circuit board
4 Compressor has a ground fault.
1 Decrease in power source voltage,
instantaneous stop
2 Defective converter drive circuit
in outdoor power circuit board
(HWM140V)
3 Defective 52C drive circuit in outdoor
power circuit board
4 Disconnection or loose connection
of rush current protect resistor RS
(HWM140Y)
5 Disconnection or loose connection
of CN2 on the outdoor power circuit
board /controller circuit board
(HWM140V)
6 Power circuit failure on DC supply for
15 VDC output on outdoor controller
circuit board (HWM140V)
1 L1-phase open (HWM140Y)
2 Disconnection or loose connection
between TB1 and outdoor noise filter
circuit board (HWM140Y)
3 Disconnection or loose connection
of CN5 on the outdoor power circuit
board/CNCT on the outdoor noise filter
board (HWM140Y)
4 Defective ACCT (AC current trans)
on the outdoor noise filter circuit
board (HWM140Y)
5 Defective input current detection
circuit in outdoor power circuit board
6 Defective outdoor controller circuit
board
1 Distortion of power source voltage,
noise superimposition
2 Disconnection or loose connection
of earth wiring
3 Disconnection or loose connection
of CN2 on the outdoor power circuit
board/controller circuit board
4 Defective power synchronous signal
circuit in outdoor controller circuit
board
5 Defective power synchronous signal
circuit in outdoor power circuit board
1 Abnormal increase in power
source voltage
2 Decrease in power source
voltage, instantaneous stop
3 Disconnection of compressor wiring
4 Misconnection of reactor (DCL)
5 Defective outdoor power circuit
board
6 Defective Reactor(DCL)
7 Disconnection or loose
connection of CN2 on the
outdoor power circuit board/
controller circuit board
24
Judgment and action
1 Check the field facility for the power supply.
2 Correct the wiring (U . V . W phase) to
compressor. Refer to "9-7. TEST POINT
DIAGRAM" (Outdoor power circuit board).
3 Replace outdoor power circuit board.
4 Check compressor for electrical
insulation. Replace compressor.
1 Check the field facility for the power supply.
2 Replace outdoor power circuit board.
(HWM140V)
3 Replace outdoor power circuit board.
4 Check RS wiring. (HWM140Y)
5 Check CN2 wiring. (HWM140V)
6 Replace outdoor controller circuit board.
(HWM140V)
1 Check the field facility for the power
supply. (HWM140Y)
2 Check the wiring between TB1 and out
door noise filter circuit board.
(HWM140Y)
3 Check CN5/CNCT wiring. (HWM140Y)
4 Replace outdoor noise filter circuit board.
(HWM140Y)
5 Replace outdoor power circuit board.
6 Replace outdoor controller circuit board.
1 Check the field facility for the power
supply.
2 Check earth wiring.
3 Check CN2 wiring.
4 Replace outdoor controller circuit board.
5 Replace outdoor power circuit board.
12 Check the field facility for the power
supply.
3 Correct the wiring (U.V.W phase) to
compressor. Refer to "9-7. TEST POINT
DIAGRAM".
4 Correct the wiring of reactor (DCL).
5 Replace outdoor power circuit board.
6 Replace Reactor (DCL).
7 Check CN2 wiring.