Siemens SINUMERIK 828D Function Manual page 23

How does SS2 function in detail?
The SS2 safety function operates as follows:
● The machine control selects the SS2 safety function using a fail-safe input:
● After a delay time, the inverter activates the Safe Operating Stop function (SOS).
Braking behavior
Figure 3-1
Safety Integrated
Function Manual, 07/2012, 6FC5397-3EP40-3BA0
– If the motor is already at a standstill when selecting SS2, after a delay time, the
inverter activates the Safe Operating Stop function (SOS).
– If the motor is not at a standstill when selecting SS2, using the Safe Acceleration
Monitor (SAM) function, the inverter monitors whether the inverter is accelerating
again.
Braking behavior and diagnostics of the safety function SS2 (Safe Stop 2)
Description of the Safety Integrated Extended Functions
3.4 Safe Stop 2 (SS2)
23