Siemens SINAMICS G115D Operating Instructions Manual page 250
Distributed drive for conveyor applications
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- Operating instructions manual (552 pages) ,
- Operating instructions manual (522 pages)
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Advanced commissioning
7.16 Safely Limited Speed (SLS)
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
EN ISO 1050, "Safety of machinery - Principles of risk assessment". The risk assessment must
confirm 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)
1.
The converter identifies when SLS is selected via secure PROFIsafe
communication.
2.
SLS allows a motor to reduce its possibly inadmissibly high speed
within a defined time – or to reduce it along a defined braking
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.
Figure 7-1
The SLS safety function is standardized
The SLS function is defined in IEC/EN 61800-5-2:
"The SLS function prevents the motor from exceeding the defined speed limit."
⇒ The SLS converter function is in conformance with IEC/EN 61800-5-2.
248
SLS
Principle of operation of SLS
Standard converter functions linked with SLS
---
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.
The converter limits the speed setpoint to values be‐
low the SLS monitoring.
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
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