The 7621 / 7620 fault is typically associated with a communication disturbance in the inverter stacks and often shows a 6422 to indicate the stack is in an unknown state.
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Related Articles
- 6422 - Undefined Hardware Failure (Stacks)
- 6440 - Transformer Protection Triggered
- 7621 - Internal Communication Failure (Stacks / ACC)
- 7707 - AC Separating Point or AC Contactor Fault
- 9009 - Quick-stop or Fast-stop Signal Active
- Error No. 0103 - Grid voltage is too high
- Error No. 0104
- Error No. 0203
- Error No. 0204
- Error No. 0205
- Error No. 0502
- Error No. 0503
- Error No. 0504
- Error No. 0505
- Error No. 0801
- Error No. 1301
- Error No. 3403
- Error No. 3404
- Error No. 3501
- Error No. 3502
- Error No. 3504
- Error No. 3507
- Error No. 3508
- Error No. 3509
- Error No. 3510
- Error No. 3512
- Error No. 3515
- Error No. 3601
- Error No. 3803