Mitsubishi Electric PURY-P72 Service Handbook page 240

[ IX Troubleshooting ]
1. Error Code
4250 (YKMU-A)
Instantaneous overcurrent (Detail code 106)
Overcurrent (effective value) (Detail code 107)
2. Error definition and error detection method
P72 model
Overcurrent 38 Apeak or 23 Arms and above is detected by the current sensor.
P96, P120, P144 models
Overcurrent 56 Apeak or 33 Arms and above is detected by the current sensor.
3. Cause, check method and remedy
Cause
(1) Inverter output related
Refer to section -7- "Inverter (YKMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 321)
1. Error Code
4250
4255
4256
Short-circuited IPM/Ground fault (Detail code 104)
2. Error definition and error detection method
When IPM/IGBT short damage or grounding on the load side is detected just before starting the inverter.
3. Cause, check method and remedy
In the case of 4250
(1) Grounding fault compressor
(2) Inverter output related
In the case of 4255 and 4256
(1) Grounding fault of fan motor
(2) Fan board failure
Refer to section -7- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter(page 310)(page 321).
HWE1116D
Refer to IX [4] -7- (2) [1] - [4], [9].(page 323)
Check the IGBT module resistance value of the INV board, if no
problems are found.
(Refer to the Trouble shooting for IGBT module)(page 328)
Cause
Cause
- 231 -
Check method and remedy
Check method and remedy
Refer to IX [4] -7- (2) [2].(page 312)(page 323)
Refer to IX [4] -7- (2) [1] - [4],
[9].(page 312)(page 323)
Check method and remedy
Refer to IX [4] -7- (2) [5].(page 314)(page 325)
Refer to IX [4] -7- (2) [6], [7],
[8].(page 314)(page 325)
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