Safe Stop 1 (Ss1) - Siemens SINAMICS S120 Function Manual

3.1.2

Safe Stop 1 (SS1)

Definition according to EN 61800-5-2:
"The function SS1 brakes the motor and
trips the function STO after a delay time."
Example of how the function can be used
Example
After an Emergency Stop button has been pressed,
the drive must be braked as quickly as possible and
brought into the STO state.
A central Emergency Stop button ensures that
several drives are braked as quickly as possible
and brought into the STO state.
How does SS1 function in detail?
Overview
The drive decelerates once "Safe Stop 1" has
been selected, and goes into the "Safe Torque
Off" state once the delay time has expired.
Select SS1
As soon as the converter identifies that SS1 has been selected via a terminal or via the
PROFIsafe safe communication, the following happens:
● If, when selecting SS1, the motor is already switched off, then until the SS1 delay time
expires, there is no response. STO becomes active after the time expires.
● If the motor is switched on when SS1 is selected, the inverter brakes the motor with the
OFF3 ramp-down time. After the delay time, STO is triggered automatically.
Details and parameterization
For further details and information on how to parameterize this function, see Section "Safe
Stop 1 (SS1, time controlled) (Page 75)".
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Overview of Safety Integrated functions
3.1 Safety Integrated Basic Functions
Possible solution
Wire the Emergency Stop button with a fail-
•
safe input.
Select SS1 via the fail-safe input.
•
Evaluating an emergency stop pushbutton
•
in a central control.
Select SS1 via PROFIsafe.
•
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