InverterSINAMICS V20Verified · sol.ls-electric.com
SINAMICS V20 F80 — AI input lost
Alarm — operational, inspection needed· AUTO-RESET
CAUSE
Why does it occur?
In 4–20 mA mode, the AI signal is below 4 mA — broken sensor wiring.
REMEDY · Step by step
How to fix it?
Check the sensor wiring and power, and measure the 4–20 mA output.
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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