Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 120

Checking code Meaning, detecting method
4240 Overloard If IAC
protection tinuously for 10 minutes during op-
eration of the inverter after 5 or
more seconds have passed since
the inverter started.
4250 IPM alarm 1 If over current, overheat or
output / undervoltage of drive cirduit is
Bus voltage detected by IPM during inverter
abnormality
operation.
[Inverter error detail : 1]
2 If VDC
is detected during inverter op-
eration.
[Inverter error detail : 1]
3 If IAC
during inverter operation.
[Inverter error detail : 11]
32 Arms is detected con- 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
7) The wiring is defective.
8) The inverter/compressor is defec-
1) The power supply voltage is abnor-
2) The wiring is defective.
300 or VDC 760V
39Arms is detected
3) The inverter / compressor is defec-
Cause
defective, or the solenoid valve
drive circuit is defective.
tive.
mal.
tive.
–119–
Checking method & Countermeasure
Is the unit's exhaust short cycling?
Clean the heat exchanger.
If the power supply voltage is less than
342V, 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 1 connections, 2 contact at the
connectors and 3 for broken wires in
the following wiring.
TB1A~NF~TB1B
TB1B~CNTR1
Go to "Treating Inverter/Compressor
Related Trouble."
• Check if an instantaneous stop or
power failure, etc. has occurred.
• Check if the voltage is the rated
voltage value.
Check 1, the connections, 2, contact
at the connectors, 3 tightening torque
at screw tightened portions, 4, wiring
polarities, 5, for broken wires, and 6,
for grounding in the following wiring.
TB1A~NF~TB1B, TB1B~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."