Mitsubishi Electric PUD-SWM60VAA-BS Service Manual page 26

Check code Abnormal point and detection method
Detailed To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs.
codes
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
Refer to "9-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
Overvoltage error
• Increase in DC bus voltage to
430V
SWM60, 80, 100, 120V,
01
SHWM60, 80, 100, 120, 140V
760V
SWM80, 100, 120Y,
SHWM80, 100, 120, 140Y
Undervoltage error
• Instantaneous decrease in
DC bus voltage to
200V
SWM60, 80, 100, 120V,
SHWM60, 80, 100, 120, 140V
350V
SWM80, 100, 120Y,
SHWM80, 100, 120, 140Y
02
Input current sensor error/
L1-phase open error
U9
• Decrease in input current
(4220)
through outdoor unit to 0.1 A
only if operation frequency is
more than or equal to 40 Hz
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
08
44 Hz or less, or 65 Hz or
more is detected on power
circuit board.
PFC error (Overvoltage/
Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowing
a) Increase of DC bus voltage
to 430 V.
10
b) Decrease in PFC control
voltage to 12 V DC or lower
c) Increase in input current
(V-type only)
OCH694A
Cause
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 (SWM-V,
SHWM-V)
3 Defective 52C drive circuit in outdoor
power circuit board
4 Defective outdoor converter circuit
board (SWM-Y, SHWM-Y)
5 Disconnection or loose connection of
rush current protect resistor RS
(SWM-Y, SHWM-Y)
6 Defective rush current protect
resistor RS (SWM-Y, SHWM-Y)
7 Disconnection or loose connection of
CN2 on the outdoor power circuit
board /controller circuit board (SWM-
V, SHWM-V)
8 Power circuit failure on DC supply
for 15 V DC output on outdoor
controller circuit board (SWM-V,
SHWM-V)
1 L1-phase open (SWM-Y, SHWM-Y)
2 Disconnection or loose connection
between TB1 and outdoor noise filter
circuit board (SWM-Y, SHWM-Y)
3 Disconnection or loose connection of
CN5 on the outdoor power circuit
board/CNCT on the outdoor noise
filter board
4 Defective ACCT (AC current trans) on
the outdoor noise filter circuit board
(SWM-Y, SHWM-Y)
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 (DCL1-3)
5 Defective outdoor power circuit board
6 Defective reactor (DCL1-3)
7 Disconnection or loose connection of
CN2 on the outdoor power circuit
board/controller circuit board
26
Judgment and action
1 Check the field facility for the power supply.
2 Correct the wiring (U . V . W phase) to com-
pressor. Refer to "9-7. FUNCTION OF
SWITCHES, CONNECTORS AND
JUMPERS". (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.
(SWM-V, SHWM-V)
3 Replace outdoor power circuit board.
4 Replace outdoor converter circuit board.
(SWM-Y, SHWM-Y)
5 Check RS wiring. (SWM-Y, SHWM-Y)
6 Replace RS. (SWM-Y, SHWM-Y)
7 Check CN2 wiring. (SWM-V, SHWM-V)
8 Replace outdoor controller circuit board.
(SWM-V, SHWM-V)
1 Check the field facility for the power supply.
(SWM-Y, SHWM-Y)
2 Check the wiring between TB1 and outdoor
noise filter circuit board. (SWM-Y,
SHWM-Y)
3 Check CN5/CNCT wiring. (SWM-Y,
SHWM-Y)
4 Replace outdoor noise filter circuit board.
(SWM-Y, SHWM-Y)
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 sup-
ply.
3 Correct the wiring (U•V•W phase) to com-
pressor. Refer to "9-6. TEST POINT
DIAGRAM". (Outdoor power circuit board).
4 Correct the wiring of reactor (DCL1-3).
5 Replace outdoor power circuit board.
6 Replace reactor (DCL1-3).
7 Check CN2 wiring.
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