Safely Limited Speed (Sls) - Siemens SINAMICS S120 Function Manual

● Safety message C01707/C30707
System errors:
● STOP F
● Safety message C01711/C30711
Features
● The drive remains in the closed-loop control mode
● A programmable standstill tolerance window is available
● STOP B is the stop response after SOS has responded
Overview of parameters
● p9301 SI motion enable safety functions (Motor Module)
● p9501 SI motion enable safety functions (Control Unit)
● p9330 SI motion standstill tolerance (Motor Module)
● p9530 SI motion standstill tolerance (Control Unit)
● p9351 SI motion SLS changeover delay time (Motor Module)
● p9551 SI motion SLS(SG) changeover delay time (Control Unit)
● r9722 CO/BO: SI motion integrated drive status signals
4.4

Safely Limited Speed (SLS)

Description
The "Safely Limited Speed" (SLS) function is used to protect a drive against unintentional
high speed. This is achieved by monitoring the current drive speed up to a switched speed
limit.
SLS is used to prevent any unintentional movements outside the valid high limit. Limits must
be specified based on results of the risk analysis. It is possible parameterize up to 4 different
speed values.
The speed limit is activated after SLS is selected and on expiration of the delay time
(p9351/p9531). The drive must be braked down to a speed below the new limit within this
Safety Integrated
Function Manual, (FHS) , 07/2007 Edition, 6SL3097-2AR00-0BP0
Note
The range of the tolerance window should be oriented on the default standstill monitoring
limit and be slightly higher than this limit.
Activation of the default monitoring functions may otherwise not be possible.
Note that safe position monitoring within a single-encoder system only works at a rough
resolution (4 x pulses per revolution) (refer to the chapter "Safe actual value acquisition".
Extended Functions
4.4 Safely Limited Speed (SLS)
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