4.3 SS1
Definition according to EN 61800-5-2:
The "SS1" function causes the motor to brake
(this function is integrated in the drive) and ini‐
tiates the "Safe Torque Off" (STO) function after
a predefined time interval has elapsed. The fol‐
lowing variants are possible:
● SS1-a with acceleration monitoring (SAM)
● SS1-r with braking ramp monitoring (SBR)
● Manually set delay time until STO is activa‐
ted.
This function corresponds to stop category 1 to
EN 60204‑1.
Example of how the function can be used
Example Possible solution
A central Emergency Stop button ensures that sev‐
eral drives are braked as quickly as possible and
brought into the STO state.
● Evaluating an Emergency Stop pushbutton
in an F-PLC
● Select SS1 via PROFIsafe.
● SS1 brakes the drives and then brings them
into the STO state.
How does SS1 function in detail?
Overview
Using the SS1 function, the converter brakes
the motor and monitors the absolute speed.
If the motor speed is low enough or the delay
time has expired, the converter safely switches
off the motor torque using STO.
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Select SS1
As soon as the converter identifies that SS1 has been selected via the PROFIsafe safe
communication, the following happens:
● If the motor has already been switched off when selecting SS1 then the converter safely
switches off the motor torque (STO).
● If the motor is switched on when SS1 is selected, the converter brakes the motor with the
AUS3 ramp-down time.
Safety functions integrated in the drive
4.3 SS1
Safety Integrated (with SINAMICS S120)
98 Commissioning Manual, 02/2020, A5E46305916B AB
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