InverterSINAMICS V20Verified · sol.ls-electric.com
SINAMICS V20 F3 — Undervoltage
Trip — immediate stop
CAUSE
Why does it occur?
Input supply sag or phase loss on R/S/T.
REMEDY · Step by step
How to fix it?
Check the input supply voltage and for phase loss, and check the main breaker/contactor condition.
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Summary based on the official Siemens AG manual. For accurate and complete information, always consult the official manual.
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