Safe stop 1 in the case of a mains failure

Answer:
In this case, the safety module must be supplied by an uninterruptible power supply (UPS) or by a 24-V power supply that is supplied by the DC bus.
This is important, because in the event of a safety module supply failure the power stages will only still remain supplied for approx. 5 ms (unless the supply is buffered like by a USV).

For a multi drive, both the safety module and the control card must be supplied fail-safe.

We do not recommend to supply the safety module via the digital outputs of the standard device because the maximum inrush current of the safety module is 350 mA.

Safe stop 1 can be activated as follows:
• 24 VDC generation using a small smoothing capacitor
• Voltage connection to both channels of a safe input of the safety module
• Input parameterisation as active sensor with the SS1 function. For this interconnection, it is not useful to increase the filter time of the safe input instead of using a capacitor because the filter time will also affect the switch-on behaviour of the safe input.