Siemens SINAMICS S120 Function Manual page 48

Overview of Safety Integrated functions
3.2 Safety Integrated Extended Functions
Brake ramp monitoring
(with or without encoder)
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•
•
•
Note
SS1 with external stop (SS1E)
If you use SS1E, neither of the two monitoring functions (SBR, SAM) is active. The drive
must be shut down in SS1E within the delay time, for example, by a user program of a CPU.
STO becomes active after the delay time expires.
Details and parameterization
For further details and information on how to parameterize this function, see Chapter "Safe
Stop 1 (SS1) (Page 98)".
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Using the SBR (Safe Brake Ramp) function,
the converter monitors whether the motor
speed decreases.
The gradient of the SBR function can be set
via the reference velocity and the ramp-down
time. The SBR function only starts after the
"Delay for braking ramp".
The SBR function starts with the speed set-
point, which was present at the instant in time
that SS1 was selected.
If the converter detects that the speed has
fallen below the speed threshold (standstill
monitoring), it safely switches off the motor
torque (STO).
Acceleration monitoring
(with or without encoder)
The converter monitors the speed of the mo-
•
tor with the SAM function.
The converter prevents the motor from accel-
•
erating again by having the monitoring func-
tion continuously track the speed as it
decreases.
The converter reduces the monitoring thresh-
•
old until the "Shutdown speed" has been
reached.
The converter safely switches off the motor
•
torque (STO), if one of the following condi-
tions is fulfilled:
– The speed has fallen below the shutdown
speed SS1.
– The maximum time until the torque is
switched off has expired.
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated