How does SS2 function in detail?
The failsafe logic (e.g. F‑PLC) selects the SS2 safety function via a failsafe input or via the
PROFIsafe safe communication.
● If, when selecting SS2, the motor is already at a standstill, after a delay time, the converter
activates the Safe Operating Stop function (SOS).
● If the drive is not at standstill when SS2 is selected, it is braked along the OFF3 ramp.
Braking is monitored with one of the following functions, depending on the setting in p9506:
– Safe Acceleration Monitor (SAM)
A faulty acceleration is therefore detected.
– Safe Brake Ramp (SBR)
In this way, a violation of the braking ramp is detected.
After a delay time, the converter activates the Safe Operating Stop function (SOS). This
function monitors the safe standstill of the drive.
Braking behavior
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Figure 4-5 Braking behavior and diagnostics (example for SS2 with SAM)
Safety functions integrated in the drive
4.6 SS2
Safety Integrated (with SINAMICS S120)
116 Commissioning Manual, 02/2020, A5E46305916B AB
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