Mitsubishi City Multi PURY-P400 - Overload Protection Troubleshooting; IPM Alarm Output; Bus Voltage Abnormality Troubleshooting

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Checking code Meaning, detecting method Cause Checking method & Countermeasure
4240
4250
Over load
protection
IPM alarm
output /
Bus voltage
abnormality
IAC 32 Arms is detected continu-
ously for 10 minutes during opera-
tion of the inverter after 5 or more
seconds have passed since the in-
verter started.
1 Over current, overheat or
undervoltage of drive cirduit is
detected by IPM during inverter
operation.
[Inverter error detail : 1]
2 VDC 300 or VDC 760V is
detected during inverter opera-
tion.
[Inverter error detail : 1]
3 IAC 39Arms is detected dur-
ing inverter operation.
[Inverter error detail : 11]
1) Air passage short cycle.
2) The heat exchanger is clogged.
3) Power supply voltage.
4) External air temperature.
5) Capacity setting error.
6) The solenoid valves (SV1, 2) are
defective, or the solenoid valve
drive circuit is defective.
7) The wiring is defective.
8) Fan motor (MF) malfunction.
9) The inverter/compressor is defec-
tive.
1) The power supply voltage is abnor-
mal.
2) Faulty wiring.
3) The inverter / compressor is defec-
tive.
Is the unit’s exhaust short cycling?
Clean the heat exchanger.
If the power supply voltage is less than
342 V, it is outside specifications.
If the external air temperature is over
43°C, it is outside the specifications.
• Is the indoor unit capacity total cor-
rect?
• Are the outdoor/indoor unit capac-
ity settings correct?
To judge failure of the solenoid valve,
go to “Individual Parts Failure Judg-
ment Methods” for the “Solenoid Valve.”
Check the following items: 1) connections,
2) contact at the connectors, and 3) for
broken wires in the following wiring.
TB1A~NF~TB1B
TB1B~FANCON board~CN04
CNMF~MF
TB1B~CNTR1
CNFC1~CNFC2
Go to “Treating Fan Motor Related
Trouble.”
Go to “Treating Inverter/Compressor
Related Trouble.”
• Check if an instantaneous stop or
power failure, etc. has occurred.
• Check if the voltage is within the
rated voltage range.
Check the following items: 1) connec-
tions, 2) contact at the connectors, 3)
tightening torque of the screws, 4) wir-
ing polarities, 5) for broken wires, and
6) for grounding for the following wiring.
TB1A~NF~TB1B, TB1A~DS~[52C,
R1, R5]~[C2, C3]~IPM Wiring
CNDC1 (G / A) ~ CNVDC (INV) Wir-
ing
* Check if the wiring polarities are as
shown on the wiring diagram plate.
Go to “Treatment of Inverter/Compres-
sor Related Trouble.”