Fanuc alarm
The batteries that keep the absolute encoders' positions alive are low (307 and 308) or dead (306).
The batteries that keep the absolute encoders' positions alive are low (307 and 308) or dead (306). If they die completely with the power off, every axis loses its zero.
Lock out the machine before reaching into it. Never bypass a door switch or interlock to clear an alarm.
If the alarm reads 300 after a battery change, the zero is lost and needs to be set again. A tech can do it if you don't have the procedure.
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The batteries that keep the absolute encoders' positions alive are low (307 and 308) or dead (306). If they die completely with the power off, every axis loses its zero.
Encoder batteries at end of life (most last about a year). Battery case contacts corroded. Battery cable damaged.
Replace the encoder batteries right away, with the control POWERED ON. Use the right type and check polarity. Put a sticker with the change date on the battery case. If the alarm reads 300 after a battery change, the zero is lost and needs to be set again. A tech can do it if you don't have the procedure.
Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.
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