Error description 231-A920
Error message
A920 Standstill monitoring SKERN-CC %1
Cause of error
- SKERN-CC detected an impermissibly large axis movement
in the SOS safety condition. The standstill speed
(50 mm/min for feed axes or 10 rpm for spindles) was
also exceeded. The maximum permissible path
in the SOS condition is defined in the machine parameter "positionRangeVmin."
Possible causes:
- Machine parameter "positionRangeVmin" is defined too small.
- The brake was deactivated before the position controller was closed.
- The brake was not activated before the position controller was opened.
- When an axis was switched on, some existing following
error was corrected.
- The brake is defective.
- There was an attempt to move an axis in the SOS condition (PLC?)
- The axis feed-rate enabling by the ApiToSafety datum PP_AxFeedEnable is missing.
Error correction
- Check the entry in machine parameter positionRangeVmin.
- Check the sequence of deactivating the brake and closing the position controller.
- Check the sequence of activating the brake and opening the position controller.
- Check whether there is a following error after an axis is locked.
- Check the interface signal of the SPLC PP_AxFeedEnable for the axis
- Inform your service agency