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

3.2.7

Safely Limited Speed (SLS)

Definition according to EN 61800-5-2:
"The SLS function prevents the motor from
exceeding the specified speed limit."
Examples of how the function can be used
Example
The machine operator must be able to enter the
machine after the protective door has been opened
and slowly move a horizontal conveyor with an
acknowledgment button in the danger zone.
A spindle drive, depending on the selection of the
cutting tool, must not exceed a specific maximum
velocity.
How does SLS function in detail?
1. The inverter recognizes the selection
of SLS via a fail-safe input or via the
PROFIsafe safe communication.
2. SLS allows a motor to reduce its pos-
sibly inadmissibly high speed within a
defined time.
SLS monitors the current speed.
The SLS setpoint limit can be trans-
ferred to the higher-level motion con-
troller (e.g. SIMOTION), where the
speed setpoint can be limited.
In addition, you can configure the setpoint limit provided by SLS as maximum speed in
the ramp-function generator. In this case, SLS limits the speed setpoint.
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Overview of Safety Integrated functions
3.2 Safety Integrated Extended Functions
Possible solution
Select SLS in the converter via a fail-safe
•
input or PROFIsafe .
The converter limits and monitors the ve-
•
locity of the horizontal conveyor.
Select SLS and the corresponding SLSlevel
•
in the converter via PROFIsafe.
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