Siemens SINAMICS PERFECT HARMONY GH180, Function Manual

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11.11 Drive Faults and Alarms Cell Bypass Related
Handling Cell Bypass Related Faults
Table 11-11 Cell bypass related faults
Fault Display Type Enable Potential Causes and Corrective Actions
Cell Bypass COM Fail F Fixed Cause
The control system is not communicating with the MV bypass board. By‐
pass is in use.
Action
1. Verify the fiber optic connection between the DCR and MV bypass
board is intact.
2. Replace MV bypass board.
3. Replace DCR.
Cell Bypass Acknowledge F Fixed Cause
The control issued a command to bypass a cell, but the MV bypass board
did not return an acknowledgement.
Action
1. Verify that the bypass contactor is working properly.
2. Check wiring between MV bypass board and contactor.
3. Replace MV bypass board or contactor.
Cell Bypass Link F Fixed Cause
The control system is not communicating with the MV bypass board, i.e.
the MV bypass board is either not receiving commands, or is getting parity
errors in the messages from the modulator. Bypass is in use.
Action
Refer to Cell bypass COM fail above.
Cell Bypass COM Alarm A Fixed Cause
The control system is not communicating with the MV bypass board, but
the bypass system is not in use.
Action
Refer to Cell bypass COM fail above.
Cell Bypass Link Alarm A Fixed Cause
The modulator is not communicating with the MV bypass board, but the
bypass system is not in use.
Action
Refer to Cell bypass COM fail above.
Cell Bypass Fault F Fixed Cause
The cell failed to go into bypass when commanded to do so.
Action
1. Check bypass system and contactor MV bypass board.
2. Refer to Cell bypass COM fail above.
Troubleshooting Faults and Alarms
11.11 Drive Faults and Alarms Cell Bypass Related
Control Manual
464
Operating Manual, A5E50491925A