InverterSINAMICS G120Verified · sol.ls-electric.com
SINAMICS G120 F30003 — Power unit: DC link undervoltage
Trip — immediate stop
CAUSE
Why does it occur?
Input phase loss, supply dip, or poor main contactor contact
REMEDY · Step by step
How to fix it?
Measure the L1/L2/L3 voltages and check the main breaker contacts
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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