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

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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:
MD36931 $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/
operating states on the machine to be monitored. The safely reduced speed func-
tion can therefore be used to implement protective measures for the operating
personnel 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
Preconditions
The following conditions must be fulfilled:
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) - - 10.2015 Edition
Safety functions integrated in the system/drive
6.5 Safely reduced speed (SG)
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