Safe Stop 2 (Ss2) - Siemens Sinamics S110 Function Manual

Safety Integrated Functions
8.5 Extended Functions
8.5.2

Safe Stop 2 (SS2)

Description
The "Safe Stop 2" (SS2) function is used to brake the motor safely on the OFF3 deceleration
ramp (p1135) with subsequent transition to the SOS state (see also "Safe Operating Stop")
after the delay time expires (p9352/p9552). The delay time set must allow for the drive to
brake down to a standstill within this time. The standstill tolerance (p9330/p9530) may not be
violated after this time.
After the braking operation is completed, the drives remain in speed control mode (speed
setpoint n = 0). The drive is not disconnected from hazardous voltage. The default setpoint
(e.g from the setpoint channel, or from a higher-level control) remains inhibited as long as
SS2 is selected. The "Safe Acceleration Monitor" (SBR) function is selected during braking.
Figure 8-4
Note
If SS2 is selected, this can cause the device that governs the speed setpoint (PLC, motion
controller, EPOS) to interrupt the ramp function by triggering OFF2.
Cause: intrinsic fault response, which is triggered when OFF3 is activated unexpectedly.
Parameterization or wiring must be carried out in such a way that the device that governs the
speed setpoint can detect that SS2 has been triggered so that it can suppress the OFF2 fault
response.
310
Sequence with SS2 selection
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions