Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
375
8.5.6 Safely Limited Speed (SLS)
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 4 different SLS speed limits
can be parameterized via parameter p9331[0..3]/p9531[0..3]; it is possible to switch between
them even if the SLS is activated.
8.5.6.1 Safely Limited Speed (SLS)
Functional features
To ensure that the drive reaches the reduced speed below the new speed limit value once
the delay time has elapsed, it must be decelerated accordingly within the delay time by
means of the higher-level motion control/setpoint channel. The previous SLS limit value is
still active during the delay time.
● A selected speed limit is activated once SLS has been selected and after the delay time
(p9351/p9551) has elapsed. When switching to a lower speed limit, the speed must be
decelerated below the new maximum limit within this delay time.
● If the actual speed is higher than the new speed limit after the delay time has elapsed, a
message is created with the parameterized stop response.
● The stop response (STOP A, STOP B, STOP C or STOP D) is parameterized via
p9363/p9563.
● During changeover to a higher speed limit, the delay time does not take effect.
● 4 parameterizable speed limits p9331[0...3] and p9531[0...3]
Delay time
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Figure 8-7 Delay time SLS phase changeover
A speed setpoint limit can be set as percentage in p9533. This value is used to calculate a
speed setpoint limit r9733, depending on the selected speed limit p9531[x].
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