Mitsubishi PUHZ-W50VHA2, Service Manual

Page: 18 / 58

18
Check Code Abnormal point and detection method Case Judgment and action
U9
Detailed
codes
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.
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
Refer to "8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION".
01
Overvoltage error
• Increase in DC bus voltage to
W50V: 400 V
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
Check the field facility for the power supply.
2
Correct the wiring (U
.
V
.
W phase) to
compressor. Refer to "8-6. TEST POINT
DIAGRAM" (Outdoor power circuit board).
3
Replace outdoor power circuit board.
4
Check compressor for electrical insulation.
Replace compressor.
02
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
W50V: 200 V
1
Decrease in power source
voltage, instantaneous stop.
2
Defective converter drive cir -
cuit in outdoor power circuit
board
3
Defective 52C drive circuit in
outdoor power circuit board
4
Disconnection or loose con -
nection of CN2 on the outdoor
power circuit board/controller
circuit board
5
Power circuit failure on DC
supply for 15 V DC output
on outdoor controller circuit
board
1
Check the field facility for the power supply.
23
Replace outdoor power circuit board.
4
Check CN2 wiring.
5
Replace outdoor controller circuit board.
04
Input current sensor error
• Decrease in input current
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.
1
Defective input current detec -
tion circuit in outdoor power
circuit board
2
Defective outdoor controller
circuit board
1
Replace outdoor power circuit board.
2
Replace outdoor controller circuit board.
08
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
more is detected on power
circuit board.
1
Distortion of power source
voltage, noise superimposi -
tion.
2
Disconnection or loose con -
nection of earth wiring
3
Disconnection or loose con -
nection of CN2 on the outdoor
power circuit board /controller
circuit board
4
Defective power synchronous
signal circuit in outdoor con -
troller circuit board
5
Defective power synchronous
signal circuit in outdoor power
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.
10
PFC error (Overvoltage/
Overcurrent)
• PFC detected any of the fol -
lowing
a) Increase of DC bus voltage
to 400 V.
b) Increase in input current to
50A peak
1
Abnormal increase in power
source voltage
2
Decrease in power source
voltage, instantaneous stop
3
Disconnection of compressor
wiring
4
Misconnection of reactor (ACL)
5
Defective outdoor power circuit
board
6
Defective reactor (ACL)
7
Disconnection or loose con -
nection of CN2 on the outdoor
power circuit board/controller
circuit board
12
Check the field facility for the power supply.
3
Correct the wiring (U · V · W phase) to com -
pressor. Refer to "8-6. TEST POINT
DIAGRAM" (outdoor power circuit board).
4
Correct the wiring of reactor (ACL).
5
Replace outdoor power circuit board.
6
Replace reactor (ACL).
7
Check CN2 wiring.
20
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at 310 V or
lower for consecutive 10 seconds
(For models equipped with
single-phase PFC only)
Not applicable for SW50VHA2 Check for the switch settings for model select
on the outdoor controller circuit board.
OCH605A