Safely-Reduced Speed (Sg); Safely-Reduced Speed - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/Drive

6.5 Safely-reduced speed (SG)

6.5 Safely-reduced speed (SG)
Description
The purpose of the SG (safely-reduced speed) function is to safely monitor the
load-side speed of an axis/spindle.
The actual speed of the axis/spindle is cyclically compared in the monitoring clock
cycle with the speed limit value selected using SGEs. The speed limit values are
defined in the following machine data/parameters:
for 840D sl:
MD 36931: $MA_SAFE_VELO_LIMIT[n]
for SINAMICS S120:
p9531: SI motion SG limit values
The speed limit values for SG1, SG2, SG3 or SG4 allow various applications/oper-
ating states on the machine to be monitored. The safely-reduced speed function
can therefore be used to implement protective measures for the operating person-
nel and machine in the setting-up mode or also in automatic operation.
Caution
For selector gearboxes, it is important to select the correct gear ratio!
Features
The features of the SG function are as follows:
S Load-side speed limit values are safely monitored
S Monitoring limit values are adapted to various operating states (e.g. test, set-
ting-up, automatic modes)
S Configurable stop response when the SG responds
Preconditions
The following prerequisites must be fulfilled (see Section 3.3, "System prerequi-
sites"):
S The option and functions must be enabled in the axis-specific machine data
S The SGEs "SBH/SG de-selection" and "SBH de-selection" must be configured
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
© Siemens AG, 2006. All rights reserved
03.06