Safe Acceleration Monitor (Sbr) - Siemens Sinamics S110 Function Manual

Safety Integrated Functions
8.5 Extended Functions
8.5.6

Safe Acceleration Monitor (SBR)

Description
The "Safe Acceleration Monitor" (SBR) function is used for safe monitoring of acceleration.
This safety function is not autarkic and is part of the SS1 (time and acceleration controlled)
and SS2 (or STOP B and STOP C) safety functions. A STOP A is generated if any drive
acceleration within the ramp-down phase exceeds the tolerance defined in p9348/p9548.
The monitoring function is activated after SS1 (or STOP B) and SS2 (or STOP C) are set
and is deactivated after the speed drops below the value set in p9346/p9546.
NOTICE
The speed limit of the SSM function (p9346/p9546) is also used as shutdown limit for the
SBR function (safe acceleration monitoring). The SBR is deactivated if the speed is below
this limit.
The effect of the SSM safety function is therefore heavily limited if a relatively high
SSM/SBR speed limit is set and the SS1 and SS2 stop functions are activated.
Figure 8-8
Calculating SBR tolerance of the actual speed
The following rules are valid for the parameterization of SBR tolerance:
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
SBR tolerance
Actual speed SBR = acceleration * acceleration duration
The following setup rule is derived thereof:
At linear axes:
SBR tolerance [mm/min] = a [m/s
318
Characteristics of the shutdown limit for SBR
= 0):
set
] * MC [s] * 1000 [mm/m] * 60 [s/min]
2
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions