Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 260

[ IX Troubleshooting ]
1. Error Code
4220 (THMU-A)
Abnormal bus voltage rise (Detail code 109)
2. Error definition and error detection method
If Vdc 400V is detected during inverter operation.
3. Cause, check method and remedy
(1) Different voltage connection
Check the power supply voltage on the power supply terminal block (TB1).
(2) INV board failure
If the problem recurs, replace the INV board.
In the case of 4220: INV board
Refer to section -6- "Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 328)
1. Error Code
4220 (YHMU-A)
Abnormal bus voltage rise (Detail code 109)
2. Error definition and error detection method
If Vdc 830V is detected during inverter operation.
3. Cause, check method and remedy
(1) Different voltage connection
Check the power supply voltage on the power supply terminal block (TB1).
(2) INV board failure
If the problem recurs, replace the INV board.
In the case of 4220: INV board
Refer to section -6- "Inverter (YHMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 333)
1. Error Code
4220 (THMU-A)
Logic error (Detail code 111)
2. Error definition and error detection method
H/W error
If only the H/W error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
In the case of 4220
(1) External noise
(2) INV board failure
Refer to section -6- "Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 328)
HWE09080
Cause
- 251 -
Check method and remedy
Refer to IX [4] -6- (2) [1].
GB