Safe Stop 2 (Ss2); How Does Ss2 Function In Detail - Siemens Sinamics S120 Function Manual

3.2.6

Safe Stop 2 (SS2)

Definition according to EN 61800-5-2:
"The function SS2 brakes the motor, moni-
tors the magnitude of the motor decelera-
tion, and after a delay time, initiates the
SOS function."
Ex ample of how the function can be used
Example
A protective door must only be opened
if a motor is in the safe standstill state.
3.2.6.1

How does SS2 function in detail?

Ov erview
The safety function SS2 monitors the
load speed and initiates the SOS function
if the SS2 delay time has expired.
With SS2, braking is monitored on the
OFF3 ramp. A faulty acceleration is de-
tected and the drive then shuts down
with STO.
If you are operating the motor with closed-loop torque control, the converter switches to the
closed-loop speed control mode when SS2 is selected.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Overview of Safety Integrated functions
3.2 Safety Integrated Extended Functions
So lution
Select SS2 in the converter via a terminal or via
•
PROFIsafe .
After braking, the converter goes into the SOS state.
•
Only then may the protective door be released.
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