Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 273

[ IX Troubleshooting ]
1. Error Code
4220
Abnormal bus voltage rise (Detail code 109)
2. Error definition and error detection method
If Vdc 1010V 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.
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
1. Error Code
4220
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
(1) External noise
(2) INV board failure
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
1. Error Code
4220
Low bus voltage at startup (Detail code 131)
2. Error definition and error detection method
When Vdc 437V is detected just before the inverter operation.
3. Cause, check method and remedy
(1) Inverter main circuit failure
Same as detail code 108 of 4220 error
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
HWE15150
Cause
- 264 -
Check method and remedy
Refer to IX [4] -6- (2) [1].
GB