Mitsubishi Electric Mr.Slim PUHZ-SHW230YKA2, Руководство по обслуживанию

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Abnormal point and detection method Case Judgment and action
Check Code
21
OCH594B
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, 2-6.
Refer to "8-8. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
01
Overvoltage error
• Increase in DC bus voltage to
760 V
1
Abnormal increase in power source
voltage
2
Defective outdoor power circuit
board
3
Compressor has a ground fault.
1
Check the field facility for the power supply.
2
Replace outdoor power circuit board.
3
Check compressor for electrical insula-
tion. Replace compressor.
02
Undervoltage error
• Instantaneous decrease in DC
bus voltage to 400 V
1
Decrease in power source voltage,
instantaneous stop
2
Defective 52C drive circuit in
outdoor power circuit board
3
Disconnection or loose connection of
rush current protect resistor RS
4
Defective rush current protect
resistor RS
5
Disconnection or loose connection of
main smoothing capacitor CB1/CB2
(Only for YKA2/YKA2R1 type)
1
Check the field facility for the power
supply.
2
Replace outdoor power circuit board.
3
Check RS wiring.
4
Replace RS.
5
Check CB1/CB2 wiring.
04
Input current sensor error/
L1-phase open error
• Decrease in input current
through outdoor unit to 0.1A
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
2
Disconnection or loose connection
between TB1 and outdoor noise filter
circuit board
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 power circuit board
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.
2
Check the wiring between TB1 and out-
door noise filter circuit board.
3
Check CN5/CNCT wiring.
4
Replace outdoor noise filter circuit
board.
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
(Only for YKA2/YKA2R1 type)
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.