Encoderless Safe Stop 1 (Time And Speed Controlled) - Siemens SINAMICS S120 Function Manual

Safety Integrated Extended Functions
5.3 Safe Stop 1 (SS1)
5.3.2

Encoderless Safe Stop 1 (time and speed controlled)

If an induction motor is being used, the "Safe Stop 1" (SS1) Safety Integrated function can
also be activated without an encoder.
Function
The motor is immediately decelerated along the OFF3 ramp (OFF3 ramping) as soon as
SS1 is triggered. Monitoring is activated once the delay time in p9582/p9382 has elapsed
(SBR delay time). Monitoring ensures that the motor does not exceed the set braking ramp
(envelope (monitoring ramp)) during braking. As soon as the speed drops below the
shutdown speed (p9560/p9360; standstill detection), safe monitoring of the brake ramp is
deactivated and safe pulse suppression (STO) is activated.
Figure 5-2
68
Mode of operation of SS1 without encoder
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated