InverterSINAMICS V20Verified · sol.ls-electric.com
SINAMICS V20 A503 — Undervoltage warning
Warning — monitor· AUTO-RESET
CAUSE
Why does it occur?
Input voltage has dropped below the rated value.
REMEDY · Step by step
How to fix it?
Measure the input voltage and check for single-phase loss or nearby loads.
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.
Open official manual ↗CALLBACK
Request an expert callback
A 12-year automation/SI engineer responds directly. Reply within 1–3 business days.