SS1-t (safe stop 1 with time control according to EN 61800-5-2)

  • SS1-t (safe stop 1 with time control according to EN 61800-5‑2) by means of suitable control (e.g. safety relay delayed disconnection).
  • The following procedure must followed:
    • Decelerate the drive via the setpoint input using a suitable deceleration ramp.
    • Disconnect the STO input (thereby triggering the STO function) after a specified safety-related time delay.
  • This safety sub-function corresponds to a controlled stop according to EN 60204‑1, stop category 1. The SS1-t function corresponds to the former presentation of the SS1(c) function.
  • The following figure illustrates the SS1-t function:

v

Speed

t

Time

t1

Time at which the braking ramp is initiated

t2

Time at which STO is triggered

Δt

Delay time until STO is triggered

Range of safe time delay

Disconnection range