Checking The Inverter For Damage During Compressor Operation - Mitsubishi Electric PURY-P200YLM-A(1) Service Handbook

[8-10 Troubleshooting Inverter Problems ]
8-10-5

Checking the Inverter for Damage during Compressor Operation

Items to be checked
Put the outdoor unit into opera-
tion.
Check the inverter output volt-
age after the inverter output fre-
quency has stabilized.
<INV20Y>
<INV30YC>
HWE1314A
Phenomena
1) Overcurrent-related problems occur im-
mediately after compressor startup.
Error code : 4250
Detail code : 101, 102, 106, 107
2) There is a voltage imbalance between
the wires after the inverter output voltage
is stabilized.
Greater than the larger of the following
values: imbalance of 5% or 5V
3) A BUS circuit error occurs immediately
after compressor startup.
Error code : 4220
Detail code : 124
4) An overcurrent error occurs during oper-
ation.
Error code : 4250
Detail code : 121,122
5) An overcurrent error occurs immediately
after compressor startup.
Error code : 4250
Detail code :101,106,107,128
6) An overvoltage error occurs during oper-
ation.
Error code : 4220
Detail code :109,110,112
7) No problems were found with items 1)
through 6).
- 340 -
Remedy
a. Check items 8-10-2 through 8-10-4
for problems.
b. Check that high and low pressures
are balanced.
c. Check that no liquid refrigerant is
present in the compressor and that
there is no liquid backflow.
→Go to "d." when the problem per-
sists after compressor startup was
repeated several times.
If normal operation is restored,
check the belt heater for problems.
d. Check that there is a pressure dif-
ference between high and low
pressures after compressor start-
up.
→Check the high pressure with
LED monitor for changes.
Replace the compressor if there is
no pressure difference. (the com-
pressor may be locked.)
Replace the INV board if there is a volt-
age imbalance.
Check the belt heater for problems if
there is no voltage imbalance.
→When the error occurred, liquid refrig-
erant may have been present in the
compressor.
a. Check that 12 VDC is supplied to
the relay at startup (Check that
LED5 lights up.)Between pins 1 (+)
and 2 (-) on the CNRY connector
b. Replace the inverter board if no
problems were found with item a.
[8-10-6 Checking the Converter for
Damage during Compressor Oper-
ation](page 341)
a. Check for refrigerant flooding.
b. Check for interphase voltage im-
balance.
c. Replace the INV board if no prob-
lems were found with the items a or
b.
d. If the problem persists after replac-
ing the inverter board,[8-10-3
Checking the Compressor for
Ground Fault and Coil Resistance
Problems](page 339)
[8-10-6 Checking the Converter for
Damage during Compressor Oper-
ation](page 341)
Normal[8-10-6 Checking the Con-
verter for Damage during Com-
pressor Operation](page 341)
GB