Siemens alarm A31442: Encoder 1: Battery voltage pre-alarm
SINAMICS S120 drive warning · SINAMICS S120
What it means
For encoders that preserve multiturn information from a battery while powered down, the battery voltage is no longer sufficient to reliably maintain the multiturn count. This is the last chance to swap the battery without losing absolute position - once depleted, the drive reports multiturn information loss and re-referencing becomes necessary.
Likely causes
- battery at end of service life
- battery holder/contact corrosion increasing resistance
- long storage time without battery replacement cycle
Triage note: Replace the battery with the machine energized as specified by the encoder/motor documentation to retain position.
Need the part urgently?
Send us alarm A31442 with your machine details — typical RFQ turnaround is 24–48h.