Mitsubishi Electric PUZ-ZM35VKA Service Manual page 41

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 "10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
Overvoltage error
• Increase in DC bus voltage to
ZM35/50VKA: 400 V
ZM60/71VHA: 430 V
01
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
ZM35–71V: 200 V
02
Input current sensor error
• Decrease in input current
through outdoor unit to 0.1A
only if operation frequency is
04
more than or equal to 40Hz
or compressor current is more
than or equal to 6A.
U9
(4220)
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
08
circuit board.
PFC/Q1 error (Overvoltage/
Undervoltage/Overcurrent)
• Increase of DC bus voltage to
ZM35/50VKA: 400V
ZM60/71VHA: 430V
• Decrease in PFC control
10 voltage to 12V DC or lower
• Increase in input current to
50A peak
(ZM35–71V)
IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at
20
310 V or lower for consecutive
10 seconds. (ZM60/71)
OCH653
Case
1 A bnormal increase in power source
voltage
2 D isconnection of compressor wiring
3 D efective outdoor power circuit board
4 C ompressor has a ground fault.
1 Decrease in power source voltage,
instantaneous stop.
2 Defective converter drive circuit
in outdoor power circuit board
(ZM60/71)/outdoor controller circuit
board (ZM35/50)
3 Defective 52C drive circuit in outdoor
power circuit board
4 Disconnection or loose connection
of CN2 on the outdoor power circuit
board /controller circuit board
(ZM60/71)
5 Power circuit failure on DC supply for
18V DC output on outdoor controller
circuit board (ZM60/71)
1 Defective ACCT (AC current trans)
2 Defective input current detection
circuit
3 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
41
Judgment and action
1 C heck the field facility for the power supply.
2 C orrect the wiring (U . V . W phase) to
compressor. Refer to "10-9. TEST
POINT DIAGRAM". (Outdoor power cir-
cuit board).
3 R eplace outdoor power circuit board.
4 C heck compressor for electrical insula-
tion. Replace compressor.
1 Check the field facility for the power
supply.
2 Replace outdoor power circuit board
(ZM60/71)/outdoor controller circuit
board (ZM35/50)
3 Replace outdoor power circuit board.
4 Check CN2 wiring. (ZM60/71)
5 R eplace outdoor controller circuit board.
(ZM60/71)
12 R eplace outdoor controller circuit board
(ZM35/50)/outdoor power circuit board
(ZM60/71).
3 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. 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.
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller circuit board.