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

4.2

Safe Stop 1 (SS1, time controlled)

General description
A Category 1 stop in accordance with EN 60204-1:2006 can be implemented with function
"Safe Stop 1" (SS1). The drive decelerates with the OFF3 ramp (p1135) once "Safe Stop 1"
is selected and switches to "Safe Torque Off" once the delay time set in p9652/p9852 has
elapsed.
CAUTION
If the "Safe Stop 1" function (time-controlled) function has been selected by parameterizing
a delay in p9652/p9852, STO can no longer be selected directly via terminals.
Functional features of Safe Stop 1
SS1 is selected by setting p9652 and p9852 (delay time) not equal to "0"
● Setting parameter p9652/p9852 has the following effect:
● When SS1 is selected, the drive is braked along the OFF3 ramp (p1135) and STO/SBC is
● The selection is realized through two channels - however braking along the OFF3 ramp,
● A debounce function can be applied to the terminals of the Control Unit and the Motor
Enabling Safe Stop 1 function
The "Safe Stop 1" (SS1) function is enabled via the following parameters:
● SS1 via terminals or PROFIsafe:
Prerequisite
The "Safe Torque Off" function must be enabled.
In order that the drive can brake down to a standstill even when selected through one
channel, the time in p9652/p9852 must be shorter than the sum of the parameters for the
data cross-check (p9650/p9850 and p9658/p9858).
The time in p9652/p9852 must be dimensioned so that after selection, the drive brakes to a
standstill.
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
– p9652/p9852 = 0: STO active
– p9652/p9852 > 0: SS1 active
automatically initiated after the delay time has expired (p9652/p9852).
After the function has been selected, the delay timer runs down - even if the function is
deselected during this time. In this case, after the delay time has expired, the STO/SBC
function is selected and then again de-selected immediately.
only through one channel.
Module in order to prevent incorrect trips due to signal disturbances. The filter times are
set using parameters p9651 and p9851.
– By entering the delay time in p9652 and p9852,
Safety Integrated Basic Functions
4.2 Safe Stop 1 (SS1, time controlled)
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