Siemens SINAMICS S120 Function Manual page 156

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
Parameterization of the brake ramp
p9581 (SI Motion braking ramp reference value) and p9583 (SI Motion brake ramp
monitoring time) are used to set the gradient of the brake ramp. Parameter p9581 determine
the reference speed and parameter p9583 define 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
SBR and OFF3 curve
The SBR curve should be aligned to the OFF3 curve. In addition, you should check that
under every load condition, the drive can follow this OFF3 ramp.
Note
Limitation of the SBR delay time
The SBR delay time (p9582) is limited to a minimum value of two SI Motion monitoring
cycles (2 · p9500), i.e. even if a value less than 2 · p9500 is parameterized for the delay time
(p9582), SBR only takes effect two safety cycles after an active SS1.
If a value greater than 2 · 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).
Responses to brake ramp violations (SBR)
● Safety message C01706 (SI Motion: SAM/SBR limit exceeded)
● Drive stopped with STOP A
● With p9516.4 = 1 ("No STOP A after encoder error with 1-encoder safety"), set the
following response:
– After an encoder error in the 1-encoder system, the drive triggers a STOP F, but not
– If safety functions are selected, the STOP F is followed by a time-controlled
You can use this behavior if, after an encoder error, coasting down would be harmful and
you should instead use the switchover to encoderless operation with encoderless
braking.
Features
● Part of the "SS1 with/without encoder", "SS2 with encoder", "SLS without encoder" and
"STOP B/STOP C (for safety with encoder)" functions.
● Parameterizable safe brake ramp
154
an immediate STOP A.
subsequent stop STOP B or STOP A - i.e. without monitoring with SBR or SAM.
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated