Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 148

[ X Troubleshooting ]
Error type
Bus voltage drop protection
Inverter Voltage
(S/W)
error related
problems
during
operation
Bus voltage rise protection
(S/W)
B us voltage error (H/W)
Logic error
Voltage meter error at start up
(Bus voltage drop protection at start up
(detected by the Main unit side))
Control power supply error
Voltage boost control error
Heatsink fault
(Heatsink overheat protection)
DCL temperature fault
Overload protection
ACCT sensor fault
ACCT sensor/circuit fault
Open-circuited IPM/loose ACCT sensor
Faulty wiring
THHS sensor/circuit fault
HWE22020
Cause
(Installation/Setting error)
Momentary power • INV board fault
failure/power failure
• 72C fault
Power supply voltage drop
• Noise filter coil (L) fault
(Inter-phase voltage is 248 V
• Wiring connections between noise
or below.)
filter board and INV board fault
Voltage drop
• Wiring connections between noise
Fan board and INV board fault
• Resistor (R1, R2) fault
Incorrect power supply • INV board fault
voltage
VDC error • INV board fault
Malfunction due to external • INV board fault
noise interference
• Fan board fault
• Faulty grounding
• Improper transmission and
external wiring installation
(Shielded cable is not used.)
• Low-voltage signal wire and
high-voltage wire are in
contact. (Placing the signal
wire and power wire in the
same conduit)
Power supply voltage drop
• INV board fault
• 72C fault
• Noise filter coil (L) fault
• Wiring connections between noise
filter board and INV board fault
• Wiring connections between noise
Fan board and INV board fault
• Resistor (R1, R2)fault
Control power supply failure • INV board, main board fault
• Broken wiring between INV and main
control board
• Contact failure
• Power supply voltage drop
• INV board fault
• Installation condition • Ground fault of the compressor
• Fan motor fault
Power supply voltage drop
(Inter-phase voltage is 180 V
• INV and Fan board fault
or below.)
• THHS sensor fault
Clogged heatsink cooling air
• IPM error (loose terminal screws,
passage
cracked due to swelling)
DCL temperature exceeds • Contact or connector failure (CNTH)
150ºC
• INV board fault
• THHS sensor fault
Short-cycling of air (reduced
air flow)
• Fan motor fault
Clogged heatsink cooling air
• Current sensor fault
passage
• Compressor fault
Power supply voltage drop
• INV and Fan board fault
(Inter-phase voltage is 180 V
or below.)
• INV board fault
• Ground fault of the compressor and
IPM error
• Poor contact at the INV board
connector CNCT2 (ACCT)
• ACCT sensor fault
• Disconnected ACCT sensor (CNCT2)
ACCT sensor fault
• Broken compressor wiring INV circuit
fault (IPM error etc.)
• ACCT sensor is connected in the
wrong phase.
• ACCT sensor is connected in the
wrong orientation.
• THHS sensor contact failure
• THHS sensor fault
• INV board fault
- 139 -
Cause Preliminary
(Parts problems) code
4320
4325
4326
(
4320
(
4320
(
4320
4325
4326
(
(
4320
4325
4326
(
4320
(
4320
(
4330
4335
4336
4320
(
4320
4325
4326
4301
(
4300
(
4300
(
4300
(
1214
01
(
Error reset *3
Unit
Error
side Remote
code *1
(PCB)
(PCB *2)
Operation
SWS1
SW
4220
4225
4226
108 108
) ( )
4220
109 109
) ( )
4220
110 110
) ( )
4220
4225
4226
111 111
) ( )
112 112
) ( )
4220
4225
4226
131 131
) ( )
4220
129 129
) ( )
4220
123 123
) ( )
4230
4235
4236
4230
126 126
) ( )
4240
4245
4246
5301
115 115
) ( )
5301
117 117
) ( )
5301
119 119
) ( )
5301
120 120
) ( )
5110
05 01 05
) ( ) ( ) ( )
06 06
( ) ( )
GB