Mitsubishi Electric PURY-P72 Service Handbook page 226

[ IX Troubleshooting ]
4220?4225
1. Error Code
4220
4225 (TKMU-A)
4226
Abnormal bus voltage drop (Detail code 108)
2. Error definition and error detection method
If Vdc 160V or less is detected during Inverter operation. (S/W detection)
3. Cause, check method and remedy
(1) Power supply environment
Find out if there was a (momentary) power failure.
Check whether the power voltage is 188V or less across all phases.
(2) Voltage drop detected
4220
P72 model
ŒCheck the voltage between the tab terminal TB-P and TB-N on the INV board while the inverter is stopped. -> Check the fol-
lowing items if it is 253V or above.
1) Confirm on the LED monitor that the bus voltage is above 160 V.
Replace the INV board if it is below 160 V.
2) Check the voltage at CN72C on the control board. ->Go to (3).
3) Check the coil connections (L1 - L3) and for coil burnout.
4) Check the wiring connections between the following sections
Between the noise filter board and INV board. Between the INV board and DCL.
Replace the noise filter board if no problems are found.-> Check the following items if the voltage is below 253V.
1) Check the coil connections (L1 - L3) and for coil burnout.
2) Check the wiring between the noise filter board and INV board.
3) Check the connection to SC-P1 and SC-P2 on the INV board.
4) Check the in-rush current resistor value. Replace the INV board if no problems are found.
P96, P120, P144 models
ŒCheck the voltage between SC-P1 and IPM N terminals on the INV board while the inverter is stopped.
-> Check the following items if it is 253V or above.
1) Confirm on the LED monitor that the bus voltage is above 160 V.
Replace the INV board if it is below 160 V.
2) Check the voltage at CN72C on the control board. ->Go to (3).
3) Check the coil connections (L1 - L3) and coil burnout.
4) Check the resistance of the diode stack. ->Refer to IX [4] -7- (7).(page 319)
5) Check the wiring connections between the following sections:
Between the noise filter board and INV board. Between the INV board and C1.
Replace the noise filter board if no problems are found.
-> Check the following items if the voltage is below 253 V.
1) Check the connection to SC-P1 and IPM N on the INV board.
2) Check the wiring between the noise filter board and INV board.
3) Check the resistance of the diode stack. ->Refer to IX [4] -7- (7).(page 319)
4) Check the in-rush current resistor value. ->Refer to IX [4] -7- (5).(page 317)
5) Replace the noise filter board.
4225
ŒCheck the voltage at CNVDC on the Fan board while the inverter is stopped.
->Check the following items if it is 253 V or above.
1) Check the voltage at CN72C on the control board. ->Go to 3).
2) Check the coil connections (L1 - L3) and for coil burnout.
3) Check the wiring connections between noise filter board, inverter board, and fan board.
Replace the noise filter board, if no problems are found.
If the problem recurs after replacing the noise filter, replace the Fan board.
-> Check the following items if the voltage is below 253V.
4) Check the CNVDC connector connection.
HWE1116D - 217 - GB