Siemens SINAMICS S120 Function Manual page 85

Calculating the SBR tolerance of the ACTUAL speed:
● The following applies when parameterizing the SBR tolerance:
● SBR tolerance:
● Recommendation:
Responses
Speed limit violated (SBR):
● STOP A
● Safety message C01706/C30706
System errors:
● STOP F with subsequent STOP A
● Safety message C01711/C30711
Features
● Element of the SS1 (time and acceleration controlled) and SS2 functions
● Parameterizable, minimum shutdown speed to be monitored
Overview of important parameters (see the SINAMICS S120/S150 List Manual)
● p9346 SI Motion SSM velocity limit (Motor Module)
● p9546 SI Motion SSM (SGA n < nx) velocity limit n_x (CU)
● p9348 SI Motion SBR actual velocity tolerance (Motor Module)
● p9548 SI Motion SBR actual velocity tolerance (Control Unit)
● p9368 SI Motion SBR velocity limit (Motor Module)
● p9568 SI Motion SBR velocity limit (CU)
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
– The maximum speed increase after SS1 / SS2 is triggered is derived from the
effective acceleration (a) and the duration of the acceleration phase.
– The duration of the acceleration phase is equivalent to one monitoring clock cycle
(p9300/p9500) MC (delay from detecting an SS1 / SS2 until n
Actual speed SBR = acceleration * acceleration duration
The following setup rule is derived thereof:
– At linear axes:
SBR tolerance [mm/min] = a [m/s
– At rotary axes:
SBR tolerance [rev/min] = a [rev/s
The SBR tolerance value entered should be approx. 20% higher than the calculated
value.
Safety Integrated Extended Functions
5.8 Safe Acceleration Monitor (SBR)
] * MC [s] * 1000 [mm/m] * 60 [s/min]
2
] * MC [s] * 60 [s/min]
2
= 0):
set
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