Starting behavior of the safety option

DANGER

After a fault, the safety option automatically restarts if the supply voltage is switched on, if the standby mode is completed, or if certain inverter faults are acknowledged.
Severe or fatal injuries.
  • The Fault status after startup parameter must be parameterized to "start inhibit". This way, the automatic restart of the safety option is prevented in the cases mentioned above.

In the "Basic settings" of the "Assist CS.." parameterization tool, the starting behavior of the safety option can be defined using the Fault status after startup parameter. The following parameter settings are possible:

  • "Start inhibit" parameter setting
  • The safety option always starts with start inhibit after the supply voltage is switched on. This parameterization is provided for independent operation.
  • "No start inhibit" parameter setting
  • The safety option starts immediately. Note that faults must be acknowledged by switching the supply voltage off and on again or by quitting standby mode. This means that a fault pending prior to switching off the supply voltage or during standby mode is acknowledged and the safety option starts up. This parameterization is designated for fieldbus operation where the higher-level controller, if necessary, takes over interlocking in case of a fault.

The STO safety sub-function is active for as long as start inhibit is active. Outputs assigned to the STO or SBC function are activated depending on the safety sub-function. If outputs are configured to "F-PO data", they will still be controlled by the higher-level safety controller. The outputs are not set to safe state

Start inhibit is deactivated if one of the following conditions is met:

  • An acknowledgment has taken place
  • Muting is activated