F7450 fault in siemens sinamics V90 drive indicates Standstill monitoring has responded. This means the axis drifted out of the defined standstill window after it was supposed to be stopped, often due to mechanical overload or poor position loop tuning.
Cause:
After the standstill monitoring time expired, the drive left the standstill window.
- Position loop gain too low.
- Position loop gain too high (instability/oscillation).
- Mechanical overload.
- Connecting cable, motor/drive converter incorrect (phase missing, interchange).
Remedy:
Check the causes and resolve.
