Siemens Sinamics S120 Function Manual page 49

Wi th braking ramp monitoring
(o nly without encoder)
•
•
Advantages:
•
•
The automatic reduction of the speed only takes effect when the ramp-function generator is inter-
1)
connected to the speed setpoint limitation.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
After the adjustable "delay time for the brak-
ing ramp", using the SBR (Safe Brake Ramp)
function, the converter monitors whether the
velocity decreases.
The converter switches from SBR to SLS as
soon as one of the following two conditions is
fulfilled:
– The SBR monitoring ramp has reached
the value of the SLS monitoring.
This case is shown in the diagram above.
– After the actual velocity has reached the
value of the SLS monitoring threshold, the
system again waits for the "delay time for
braking ramp" until SLS becomes active.
Already when braking, the converter detects
as to whether the load velocity decreases too
slowly.
The feedback signal "SLS active" generally
comes earlier than without acceleration moni-
toring.
Wi thout braking ramp monitoring
1)
(w ith or without encoder)
The converter monitors the load velocity after
•
the "delay time for SLS switchover" has ex-
pired.
Advantage:
Commissioning is simplified, because instead
•
of the subfunction SBR or SAM of the alterna-
tive brake ramp monitoring, you only have to
set the delay time.
Overview of Safety Integrated functions
3.2 Safety Integrated Extended Functions
49