Siemens SINAMICS S120 Commissioning Manual page 245

Safe Brake Ramp (SBR)
The "Safe Brake Ramp" (SBR) function provides a safe method for monitoring the brake
ramp. The "Safe Brake Ramp" function is used to monitor braking with the functions "SS1
with/without encoder," "SLS without encoder," SS2 and STOP B / STOP C (for safety with
encoder). For SLS, the setpoint limitation of the Safety Integrated Functions (r9733) must be
connected to the ramp-function generator (p1051/p1052).
Figure 4-103 Example: SBR
The motor is decelerated with the OFF3 ramp as soon as "SS1", "SS2" or "SLS" is triggered.
Monitoring of the braking ramp is activated once the delay time in p9582 has elapsed.
Monitoring ensures that the motor does not exceed the set braking ramp (SBR) when
braking.
The gradient of the braking ramp is defined using the reference velocity p9581 and the
braking ramp monitoring time p9583. Parameter p9581 defines the reference velocity, and
parameter p9583 defines the ramp-down time. Parameter p9582 is used to set the time
which passes after the triggering of "SS1", selection of "SLS" or SLS level changeover and
the start of brake ramp monitoring.
Note
Limitation of the delay time
The delay time (p9582) is limited to a minimum value of two SI Motion monitoring cycles (2 x
p9500), i.e. even if a value less than 2 x p9500 is parameterized for the delay time (p9582),
SBR only takes effect two cycles after an active SS1.
If a value greater than 2 x p9500 is parameterized for the delay time (p9582), SBR takes
effect after active SS1 after the time p9582. Ensure that you round off the SBR delay time to
an integer multiple of the safety cycle (p9500).
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
Commissioning
4.10 Safety Integrated commissioning
245