Safely Limited Speed (Sls) - Siemens SINAMICS G120 Function Manual

Description

3.10 Safely Limited Speed (SLS)

3.10 Safely Limited Speed (SLS)
How does SLS function?
Table 3- 6 Principle of operation of SLS, selected when the motor is rotating
Safely Limited Speed (SLS)
1. The inverter recognizes the
selection of SLS via a safety input
or via the PROFIsafe safe
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 inverter monitors the absolute
actual speed against the set SLS
monitoring.
The inverter signals that "SLS is
active" via a safety output or via the
PROFIsafe safe communication.
If the motor speed exceeds the
SLS monitoring, the inverter
responds with a "safe stop" and
brakes the motor as quickly as
possible.
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 inverter function complies with what is defined in the standard.
34
An inverter with active SLS function can reduce the
velocity or speed of a machine component and monitor
it without having to interrupt machining operation.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Standard inverter functions linked
with SLS
---
The inverter limits the speed
setpoint to values below the SLS
monitoring.
If the motor rotates faster than the
SLS monitoring value, then the
inverter brakes the motor along the
OFF3 ramp.
The inverter limits the speed
setpoint to values below the SLS
monitoring.
Function Manual, 04/2014, FW V4.7, A5E34261271B AA