Siemens SINAMICS S120 Function Manual page 79

Restart after OFF2
If the drive has been switched off via OFF2/STO, the following steps need to be carried out
before a safe restart can be performed:
1st scenario:
● SLS not selected, OFF2 is active (STO active)
● Deselect STO.
● Rising edge at OFF1
2nd scenario:
● Switch-on status: Encoderless SLS selected, STO selected, OFF2 active
● Deselect STO.
● Unless there is a drive enable via a positive edge at OFF1 within 5 seconds, a safety fault
3rd scenario:
● Switch-on status: Encoderless SLS selected, STO not selected, OFF2 active
● Unless there is a drive enable via a positive edge at OFF1 within 5 seconds after ramping
Parameterization of the encoderless brake ramp
p9581/p9381 and p9583/p9383 are used to set the steepness of the brake ramp.
Parameters p9581/p9381 determine the reference speed and parameters p9583/p9383
define the monitoring period. Parameters p9582/p9382 are used to set the time between the
triggering of Safe Stop 1 and the start of brake ramp monitoring.
Restrictions
The following restrictions apply to the encoderless SS1 and encoderless SLS functions:
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
will be output as speed monitoring will be impossible.
up is complete, a safety fault will be output as speed monitoring will be impossible.
Cannot be used in conjunction with
1 SINAMICS chassis and cabinet formats
2 Synchronous motors
3 Torque control
4 SW gating unit
Cannot be used in conjunction with the following functions
1 Motor identification
2 Rotating measurement
3 Flying restart
4 Pole position identification
5 Vdc controller
6 DC braking
7 Measurement functions (frequency response measurement)
8 Current limitation (I )
Lim
Safety Integrated Extended Functions
5.6 Safely-Limited Speed (SLS)
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