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[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
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HWE1314A GB
7-6-8 Error Codes [4220, 4225, 4226] Detail Code 108
1. Error code definition
Abnormal bus voltage drop (Detail code 108)
2. Error definition and error detection method
If Vdc 289V 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 (Between L1 and L2, L2 and L3, and L1 and L3) is 342V or less across all phases.
(2) Voltage drop detected
4220
INV20Y

Check the voltage between the FT-P and FT-N terminals on the INV board while the inverter is stopped and if it is 420 V or
above, check the following items.
1) Confirm on the LED monitor that the bus voltage is above 289V.
Replace the INV board if it is below 289 V.
2) Check the voltage at CN72 on the control board. →Go to (3).
3) Check the noise filter coil connections 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 72C if no problems are found.
5) Check the IGBT module resistance on the INV board. Refer to the following page(s). [8-10-15 Troubleshooting Prob-
lems with IGBT Module](page 345)

Check the voltage between the FT-P and FT-N terminals on the INV board while the inverter is stopped and if it is less than
420 V, check the following items.
1) Check the coil connections and for coil burnout on the noise filter.
2) Check the wiring between the noise filter board and INV board.
3) Check the connection to SCP1 and SC-P2 on the INV board.
4) Check the in-rush current resistor value.
5) Check the 72C resistance value.
6) Check the DCL resistance value.
Replace the INV board if no problems are found.
INV30YC

Check the voltage across SC-P and SC-N on the inverter board while the inverter is stopped.
If the voltage is 420 volts or above, check the following.
1) Check on the LED monitor that the BUS voltage is greater than 289 volts. If it is equal to or below 289 volts, replace
the inverter board.
2) Check the coli (L) for proper connection, and check for broken wiring.
3) Check the wiring between the following parts.
Between the noise filter board and inverter board, and between the inverter board and the capacitor board.
4) If the problem persists after restart, replace the inverter board.
If the voltage is below 420 volts, check the following.
1) Check the coli (L) for proper connection, and check for broken wiring.
2) Check the wiring between the following parts.
Between the noise filter board and inverter board, and between the inverter board and the capacitor board.
3) Check the inrush current resistor value. Refer to section [8-10-14 Simple Check on Inverter Circuit Components](page
345)
4) If the problem persists after restart, replace the inverter board.