Cause : In position - timer monitoring comes when the "in position - exact stop window" was not reached within the time specified in "in position - timer monitoring":

• In position - exact stop window (machine data 17) too small.
• In position - timer monitoring (machine data 16) too short.
• Position controller or speed controller not optimized.
• Mechanical causes.

Follow these steps to correct the fault:

1. Check and correct the machine data.
2. Optimize the position controller or speed controller.
3. Check the mechanical system.