26
OCH756
Check code Abnormal point and detection method
Cause
Judgment and action
U9
(4220)
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 "9-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
01
Overvoltage error
• Increase in DC bus voltage to
430V
SWM60, 80, 100, 120V,
SHWM60, 80, 100, 120, 140V
760V
SWM80, 100, 120Y,
SHWM80, 100, 120, 140Y
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 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.
02
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
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
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)
04
Input current sensor error/
L1-phase open 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
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
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.
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-
lowing
a) Increase of DC bus voltage
to 430 V.
b) Decrease in PFC control
voltage to 12 V DC or lower
c) Increase in input current
(V-type only)
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
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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Содержание PUD-SHWM100VAA
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