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Figure 4-15 Switching to a higher speed level
4.10.1 Details and parameterization
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.
Safely Limited Speed 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 using parameter p9531[0..3]; it is possible to switch between them even if the
SLS is activated.
An override can also be added to SLS limit value 1. In operation, this override can be varied
using a PROFIsafe telegram.
Note
Deviation of the displayed speed limit
The SLS speed limit displayed in r9714[2] can deviate slightly from the specified SLS speed
limit. The reason for this is the internal resolution (r9732) of the speed values.
Note
Response in the event of a communication error
If p9580 ≠0 and SLS is active, in the event of communication failure, the parameterized ESR
reaction is only realized if, as SLS response, a STOP with delayed pulse cancellation when the
bus fails has been parameterized (p9563[0...3] ≥ 10).
Safety functions integrated in the drive
4.10 SLS
Safety Integrated (with SINAMICS S120)
138 Commissioning Manual, 02/2020, A5E46305916B AB
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