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 2 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 2 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 is stopped with STOP A
● For an encoder fault in a 1-encoder system, the "Safe Acceleration Monitoring" function is
not active. A Category 0 or 1 stop response (EN 60204‑1) can be set with parameter
p9516.4.
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
4.9.1 Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p9560 SI Motion STO shutdown speed (Control Unit)
● p9581 SI Motion braking ramp reference value (Control Unit)
● p9582 SI Motion braking ramp delay time (Control Unit)
● p9583 SI Motion braking ramp monitoring time (Control Unit)
Safety functions integrated in the drive
4.9 SBR
Safety Integrated (with SINAMICS S120)
132 Commissioning Manual, 02/2020, A5E46305916B AB
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