Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

Page: 315 / 503

[8-10 Troubleshooting Inverter Problems ]
48
- chapter 8 BS_08_L
8 Troub
le
sho
o
ting Bas
e
d on Ob
ser
ved
Sy
mp
toms
8-10-11 Checking the Pump Motor for Ground Fault and Coil Resistance Problems
8-10-12 Checking the Error-Detection Circuit on the Pump INV Board (Without load)
8-10-13 Checking the Pump INV Board for Damage (Without load)
Items to be checked Phenomena Remedy
Remove pump motor wiring. Check
insulation resistance and coil resis-
tance.
1) Pump motor insulation failure.
If < 1 M Ω , defect.
Replace the pump.
2) Pump motor wire failure.
Target coil resistance: Approx. 10 Ω .
(Changes with temperature)
Replace the pump.
Items to be checked Phenomena Remedy
<INV/S20> 1) IPM/overcurrent cut-off error occurs.
Check code: 4255, 4256
Detail code: 101, 104, 105, 106, 107,
128
Replace the INV board.
1) Disconnect the inverter output
wiring from the INV board con-
nector (CNINV).
2) Logic error occurs.
Check code: 4225, 4226
Detail code: 111
Replace the INV board.
2) Operate the outdoor unit and
the HBC.
3) Sensor-related circuit error occurs.
Check code: 5305, 5306
Detail code: 117, 127
Replace the INV board.
4) Open-circuited IPM error occurs.
Check code: 5305, 5306
Detail code: 119
Normal
Items to be checked Phenomena Remedy
<INV/S20> 1) Inverter-related error is detected. Set SW 1-1 on the INV board to
OFF, and go to [8-10-12 Checking
the Error-Detection Circuit on the
Pump INV Board (Without load)].
1) Disconnect the inverter output
wiring from the INV board con-
nector (CNINV).
2) Inverter voltage is not output. Replace the INV board.
2) Set SW 1-1 on the INV board to
ON.
3) Line voltage imbalance of at least 5%
or 5 V occurs.
Replace the INV board.
3) Operate the outdoor unit and
the HBC.
Wait until the inverter output fre-
quency is stabilized, and then
check the inverter output volt-
age.
4) No line voltage imbalance exists. Normal
*Check the voltage, and set SW 1-1
on the INV board to OFF.
0000006416.BOOK 48 ページ ２０２１年１０月２６日 火曜日 午後５時３０分