Mitsubishi Electric PUHZ-SW50VHA Service Manual Page 19
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Error Code
Abnormal point and detection method
Case
Judgment and action
19
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 10-10.
01
Overvoltage error
• Increase in DC bus voltage to
420V
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
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.
02
Undervoltage error
• Instantaneous decrease in DC
bus voltage to 200V
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
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.
04
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
or compressor current is more
than or equal to 6A.
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 Check CN5/CNCT wiring.
2 Replace outdoor noise filter circuit
board.
3 Replace outdoor power circuit board.
4 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 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 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/
Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowings
a) Increase of DC bus voltage
to 420V.
b) Decrease in PFC control
voltage to 12V DC or lower
c) 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 connection
of CN2 on the outdoor power circuit
board/controller circuit board
PFC/IGBT error (Undervoltage)
•
When compressor is running,
DC bus voltage stays at 310V or
lower for consecutive 10 seconds
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
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller 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.
20
OCH525
- SERVICE MANUAL 1
- SAFETY PRECAUTION 2
- REFERENCE MANUAL 2
- [1] Cautions for service 3
- [3] Service tools 4
- Dimension A 5
- Dimension B 5
- 3 FEATURES 6
- 4 SPECIFICATIONS 6
- MICROPHONE 8
- 6 OUTLINES AND DIMENSIONS 9
- 7 WIRING DIAGRAM 10
- 8 WIRING SPECIFICATIONS 11
- 9 REFRIGERANT SYSTEM DIAGRAM 12
- 10 TROUBLESHOOTING 14
- 63HS) exceeds 70: 17
- •V•W phase) to 20
- SW40/50 63 61 60 58 56 53 50 23
- 10-4. TROUBLESHOOTING 24
- • Before repair 31
- Motor for compressor 34
- Linear expansion valve 34
- (LEV-A/ LEV-B) 34
- For SW40-50 34
- DC DC250~330V 35
- CC DC15V 35
- <Composition> 38
- (Voltage between pins 39
- (when stopped), DC 1– 39
- (when operated) 39
- → Transmitting signal 41
- Power consumption 43
- (SW1 on) 43
- Detailed 44
- The ones digit : Relay output 46
- SW2 setting 47
- Display detail 47
- Explanation for display 47
- Capacity Code 49
- SW50V 10 49
- Explanation for display Unit 52
- •The ones digit 53
- 11 DISASSEMBLY PROCEDURE 55
- OPERATING PROCEDURE PHOTOS 56
- Made in Japan 60
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