Fanuc alarm DS0307: APC ALARM: BATTERY LOW 1
servo APC alarm (absolute pulse coder) · Fanuc 0i-D
What it means
The absolute pulsecoder backup battery has dropped to a voltage where replacement is required but data retention is still intact. This is a warning window: replace promptly with the control powered on, since continued operation risks crossing into a battery-zero condition that destroys the absolute reference. Check that the correct battery type is installed and that terminals are not corroded.
Likely causes
- Battery end-of-life (typical service life exceeded)
- High ambient temperature accelerating battery drain
- Poor contact in battery holder or connector
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A98L-0031-0012
battery · Common cause
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A02B-0200-K102
battery · Common cause
Need the part urgently?
Send us alarm DS0307 with your machine details — typical RFQ turnaround is 24–48h.