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 SLS (SG) limits (Control Unit)
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.
Warning
!
For control gears, 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,
setting–up, automatic modes)
S Configurable stop response when the SG responds
Prerequisites
The following prerequisites must be fulfilled (see Chapter 3.1, "System prerequi-
sites"):
S The option and functions must be enabled in the axis–specific machine data
S The SGEs "SBH/SG deselection" and "SBH deselection" must be configured
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
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05.08