Safe Acceleration Monitoring (Sbr) - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/Drive

6.4 Safe acceleration monitoring (SBR)

6.4 Safe acceleration monitoring (SBR)
Description
Using this function, for STOPs B and C the system monitors as to whether the
drive speed increases.
Features
The most important features include:
S Fastest possible detection if the axis starts to re–accelerate when braking
S SBR is automatically activated, when a STOP B or C has been initiated
S STOP A is initiated when SBR responds
Activating the SBR
When a STOP B or C is initiated, the actual speed plus the speed tolerance, de-
fined in the machine data/parameter, is activated as the speed limit. When the ac-
tual speed reduces, then this speed limit is correspondingly corrected; however, for
an increased speed, it is not changed. If the drive speed exceeds the actual speed
limit then a STOP A is initiated. If the axis starts to re–accelerate while braking,
this is detected as quickly as possible and prevented.
Machine data/parameters for the SBR speed tolerance:
for 840D sl:
MD 36948: $MA_SAFE_STOP_VELO_TOL
for SINAMICS S120:
p9548: SI motion SBR actual speed tolerance (Control Unit)
The speed limit is corrected until the speed, defined in the following machine data,
is undershot (fallen below). After that, the limit value of the SBR monitoring is fro-
zen to the value in MD/parameter 36946/p9546 plus the value in MD/parameter
36948/p9548.
for 840D sl:
MD 36946: $MA_SAFE_VELO_X (speed limit n
for SINAMICS S120:
p9546: SI motion SSM (SGA n < nx) speed limit n_x (CU)
6-144
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
)
x
© Siemens AG 2008 All Rights Reserved
05.08