Siemens SINAMICS S120/S150 Drive
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Feb 21, 2024 9:21 am
Cause : Power unit EP 24 V missing in operation comes when the pulse enable via terminal EP at the Line Module (X21.3, X21.4) was withdrawn.
- do not open the line side switch in operation - only when the pulses are inhibited.
- check the wiring of terminal EP (X21.3, X21.4) at the Line Module to exclude any poor contacts
