Siemens SINAMICS S150 - Safe Stop 2 (SS2); General Description

Safety Integrated Extended Functions
6.5 Safe Stop 2 (SS2)
Safety Integrated
Function Manual, 05/2010, A5E03264275A
87
6.5 Safe Stop 2 (SS2)
6.5.1 General description
Note
The safety function "Safe Stop 2" (SS2) can only be used with an encoder.
The "Safe Stop 2" (SS2) function is used to brake the motor safely along the OFF3
deceleration ramp (p1135) with subsequent transition to the SOS state (see "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 the speed control mode with
the speed setpoint n = 0.
WARNING
The motor is supplied with current during SS2.
The default setpoint (e.g from the setpoint channel, or from a higher-level control system)
remains locked as long as SS2 is selected. The "Safe Acceleration Monitor" (SBR) function
is selected during braking.
66VHOHFWLRQ
626VHOHFWLRQ
0D[GHOD\WLPH
SS
Q
W
Figure 6-3 Sequence with SS2 selection