Safe Braking Ramp (Sbr) - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/Drive

6.4 Safe braking ramp (SBR)

6.4 Safe braking ramp (SBR)
Description
This function is based on the assumption that after a stop request, the actual
speed must decrease (the speed characteristic is monitored).
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 request is initiated, the actual speed plus the speed tolerance, defi-
ned in the machine data, is activated as the speed limit. This limit is compared with
the actual speed (must decrease or remain the same) and is cyclically corrected. If
the axis starts to re-accelerate while braking, this is detected as quickly as possi-
ble.
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
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 speed limit n
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
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© Siemens AG, 2006. All rights reserved
03.06