Overvoltage Error; Undervoltage Error; Input Current Sensor Error; Pfc Error - Mitsubishi Electric PUHZ-SW40VHA Service Manual

Abnormal point and detection method
Error Code
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.
Detailed
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
codes
Refer to 10-10.

Overvoltage error

• Increase in DC bus voltage to
420V
01

Undervoltage error

• Instantaneous decrease in DC
bus voltage to 200V
02

Input current sensor error

• Decrease in input current
through outdoor unit to 0.1A
only if operation frequency is
more than or equal to 40Hz
04
or compressor current is more
than or equal to 6A.
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
U9
more is detected on power
circuit board.
PFC error (Overvoltage/
Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowings
a) Increase of DC bus voltage
to 420V.
10
b) Decrease in PFC control
voltage to 12V DC or lower
c) Increase in input current to
50A peak
PFC/IGBT error (Undervoltage)
• When compressor is running,
DC bus voltage stays at 310V or
20
lower for consecutive 10 seconds
OCH525
Case
1 Abnormal increase in power source volt-
age
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 Disconnection or loose connection
of CN52C on the outdoor noise filter
circuit board/controller circuit board
3 Defective converter drive circuit in
outdoor power circuit board
4 Defective 52C drive circuit in outdoor
noise filter circuit board
1 Disconnection or loose connection of
CN5 on the outdoor power circuit board/
CNCT on the outdoor noise filter board
2 Defective ACCT (AC current trans)
on the outdoor noise filter circuit
board
3 Defective input current detection
circuit in outdoor power circuit board
4 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 (ACL)
5 Defective outdoor power circuit board
6 Defective reactor (ACL)
7 Disconnection or loose connection
of CN2 on the outdoor power circuit
board/controller circuit board
1 Incorrect switch settings on the
outdoor controller circuit board for
model select
2 Defective outdoor power circuit
board
3 Defective outdoor controller circuit
board
19
Judgment and action
1 Check the field facility for the power supply.
2 Correct the wiring (U . V . W phase) to
compressor. Refer to 10-9 (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 Check CN52C wiring.
3 Replace outdoor power circuit board.
4 Replace outdoor noise filter circuit
board.
1 Check CN5/CNCT wiring.
2 Replace outdoor noise filter circuit
board.
3 Replace outdoor power circuit board.
4 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 10-9 (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.
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller circuit board.