F1912 fault in Siemens V70 Drive indicates a Clock cycle synchronous operation sign-of-life failure. This means the maximum permissible number of errors in the controller sign-of-life has been exceeded in cyclic operation.
Cause: The maximum permissible number of errors in the controller sign-of-life (clock synchronous operation) has been exceeded in cyclic operation.
Remedy:
- Physically check the bus (cables, connectors, terminating resistor, shielding, etc.).
- Correct the interconnection of the controller sign-of-life.
- Check whether the controller correctly sends the sign-of-life.
- Check the permissible telegram failure rate.
- Check the bus and controller for utilization level (e.g. bus cycle time was set too short).
