F1912 fault in Siemens V70 Drive

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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).

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