Sls (Extended Functions) - Siemens SINAMICS S120 Commissioning Manual

4.10.4.9

SLS (Extended Functions)

The "Safely-Limited Speed" ("SLS") function is used to protect a drive against unintentionally
high speeds in both directions of rotation. This is achieved by monitoring the current drive
speed up to a speed limit.
"SLS" prevents a parameterized speed limit from being exceeded. Limits must be specified
based on results of the risk analysis. Up to four different SLS speed limits can be
parameterized; it is possible to switch between them even if the SLS is activated.
A PROFIsafe override can also be added to SLS limit value 1. In operation, this PROFIsafe
override can be varied using a PROFIsafe telegram.
SLS via PROFIsafe with encoder and onboard terminals
Features:
● When SLS is selected, the monitoring only takes effect after the configured delay time
has expired (p9551). Within this time, the actual speed must be below the (selected) limit.
The delay time is not effective when SLS is deselected.
● After switching to a lower limit value (p9531), the actual speed of the drive must have
dropped below the new limit within the delay time (p9551). The existing limit remains
active during the delay time. The lower limit value becomes active after the delay time
has expired. This also applies to a reduction of the limit value via PROFIsafe.
● If the actual speed of the drive is higher than the new Safely-Limited Speed limit after the
delay time has elapsed, a message is generated with the parameterized stop response.
● The stop response (STOP A, STOP B, STOP C, STOP D or STOP E) is parameterized
with p9563. Click on the green arrow next to the SLS level.
● On switchover to a higher limit value, the delay time is not active and the high limit value
becomes active immediately. This also applies to increasing the limit value via
PROFIsafe.
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
Commissioning
4.10 Safety Integrated commissioning
253