Mitsubishi Electric PURY-P120, Service Handbook

Page: 240 / 411

[
IX
Troubleshooting ]
- 231 - HWE09130 GB
1. Error Code
Instantaneous overcurrent (Detail code 106)
Overcurrent (effective value) (Detail code 107)
2. Error definition and error detection method
P72 model
Overcurrent 94 Apeak or 22 Arms and above is detected by the current sensor.
P96, P120, P144 models
Overcurrent 94 Apeak or 35 Arms and above is detected by the current sensor.
3. Cause, check method and remedy
Refer to section -7- "Inverter (YJMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 320)
1. Error Code
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
In the case of 4255
Refer to section -7- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
4250 (YJMU-A)
Cause Check method and remedy
(1) Inverter output related Refer to IX [4] -7- (2) [1] - [4].(page 322)
Check the IGBT module resistance value of the INV board, if no
problems are found.
(Refer to the Trouble shooting for IGBT module)
4250
4255
Cause Check method and remedy
(1) Grounding fault compressor Refer to IX [4] -7- (2) [2].
(2) Inverter output related Refer to IX [4] -7- (2) [1] - [4].
Cause Check method and remedy
(1) Grounding fault of fan motor Refer to IX [4] -7- (2) [5].
(2) Fan board failure Refer to IX [4] -7- (2) [6].
(3) Electromagnetic contactor (52F) actuation failure
(P120, P144 only) Check the wiring between the FAN board, 52F, and
fan motor.