Use of safety controllers

The switch-off test pulse of the used safe digital outputs (F-DO) must be ≤ 1 ms and another switch-off test pulse must only occur 2 ms later at the earliest.

[1]

High

[2]

Low

 

INFORMATION

  • SEW-EURODRIVE recommends setting the dark tests (switch-off tests) to 0.8 ms due to tolerances in the safety controllers. Refer to the description of your safety controller for where and how to set this time.
  • If the safety-related control voltage at the STO connection is switched off (STO activated), the specifications in chapter External safety controller requirements must be adhered to in regard to the test pulses.
  • If F_STO_P1 and F_STO_P2 are connected to DC 24 V and if F_STO_M is connected to GND, STO is deactivated.