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Switching to a lower speed level
With braking ramp monitoring
(only without encoder)
● Once the "delay time for braking ramp" has
● The converter switches over from SBR moni‐
The automatic reduction of the speed only takes effect when the ramp-function generator is
1)
interconnected to the speed setpoint limitation.
Switching to a higher speed level
If you switch over from a lower to a higher speed level, the converter immediately monitors the
actual velocity against the higher velocity.
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
elapsed, the converter monitors the motor ve‐
locity using the function SBR (Safe Brake
Ramp).
toring to level 2 of SLS monitoring as soon as
one of the following conditions is fulfilled:
–
The SBR monitoring ramp has reached the
value of the SLS monitoring.
This case is shown in the diagram above.
–
The load velocity has decreased down to
the value SLS monitoring and the "delay
time for braking ramp" has expired.
Without braking ramp monitoring
1)
(with or without encoder)
● The converter monitors the velocity with the
Safety functions integrated in the drive
lower SLS level after the "delay time for SLS
changeover" has expired (this is the same de‐
lay time that applies after selecting the function
SLS).
4.10 SLS
137
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