The converter with active SLS function monitors the motor speed. When the monitoring limit
is exceeded, the converter stops the motor as quickly as possible.
As a consequence, the SLS function allows an electrically driven machine component to be
operated with a temporarily reduced speed or velocity that is not hazardous.
Requirement
The machine manufacturer has already performed a risk assessment, e.g. in compliance with
ENISO1050, "Safety of machinery - Principles of risk assessment". The risk assessment must
conrm that it is permissible to use the SLS safety function.
Function description
Table 7-1 An overview of the principle of operation of SLS, selected when the motor is rotating
Safely Limited Speed (SLS) Standard converter functions linked with SLS
1. The converter identies when SLS is selected via secure PROFIsafe
communication.
---
2. SLS allows a motor to reduce its possibly inadmissibly high speed
within a dened time – or to reduce it along a dened braking
ramp.
The converter limits the speed setpoint to values be‐
low the SLS monitoring.
If the motor rotates faster than the SLS monitoring
value, then the converter brakes the motor along the
OFF3 ramp.
3. The converter monitors the absolute actual speed against the set
SLS monitoring.
The converter signals "SLS is active" via PROFIsafe.
If the motor speed exceeds the SLS monitoring, the converter re‐
sponds with a "safe stop" and brakes the motor as quickly as pos‐
sible.
The converter limits the speed setpoint to values be‐
low the SLS monitoring.
6SHHG
6HOHFW6/6
6/6LVDFWLYH
SLS
W
W
W
Figure7-1 Principle of operation of SLS
The SLS safety function is standardized
The SLS function is dened in IEC/EN 61800-5-2:
"The SLS function prevents the motor from exceeding the dened speed limit."
⇒ The SLS converter function is in conformance with IEC/EN 61800-5-2.
Advanced commissioning
7.16Safely Limited Speed (SLS)
SINAMICS G115D Wall Mounted distributed drive
248 Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
To Next Page
Loading...
