Monitoring modes
● For the Extended Functions with or without encoder, you can choose between 2 different
monitoring modes of the function SS1:
– Safe Brake Ramp (SBR)
– Safe Acceleration Monitor (SAM)
Brake ramp monitoring
(with or without encoder)
Acceleration monitoring
(with or without encoder)
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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 fall‐
en below the speed threshold (standstill moni‐
toring), it safely switches off the motor torque
(STO).
● The converter monitors the speed of the motor
with the SAM function.
● The converter prevents the motor from accel‐
erating again by having the monitoring function
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 tor‐
que (STO), if one of the following conditions is
fulfilled:
– The speed has fallen below the shutdown
speed SS1.
– The maximum time until the torque is
switched off has expired.
Safety functions integrated in the drive
4.3 SS1
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 99
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