4.2.3 Safe Stop 1 (SS1, time-controlled)
Overview
The "Safe Stop 1" function (SS1, time-control‐
led) causes a drive-autonomous deceleration
of the motor and initiates the "Safe Torque Off"
(STO) function after a predefined time interval
has elapsed. This function corresponds to stop
category 1 to EN 60204‑1.
Functional features
There are the following variants for the Basic Function "Safe Stop 1":
● SS1 with OFF3 (SS1-t according to IEC 61800-5-2)
● SS1 with external stop (SS1E)
The setting of the SS1 response is performed during the Safety commissioning in the step
"Parameterization"
Applications
SS1 can be used wherever the load torque cannot stop the motor in a sufficiently short time
as a result of friction - or where there is a safety risk if the drive coasts down (STO).
SS1 with OFF3 (SS1-t)
When SS1-t is selected, the motor speed is reduced along the OFF3 ramp for the duration of
the selected delay time. After the delay time expires, the converter activates the STO function
(independent of the actual speed).
Note
There is a single-channel monitoring of the braking process at the OFF3 ramp!
Safety functions integrated in the drive
4.2 Basic Functions
SINAMICS S210 servo drive system
Operating Instructions, 12/2017, A5E41702836B AA 63
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