Override For Safely Reduced Speed - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/Drive
6.5 Safely reduced speed (SG)
6.5.4

Override for safely reduced speed

General information
16 SG override stages for the limit values of safely reduced speeds 2 and 4 using
SGEs. This means that the limit values for SG2 and SG4 can be more finely
graduated.
Using the following machine data, an override stage can be assigned factors of
between 1 and 100%:
for 840D sl:
MD 36932: $MA_SAFE_VELO_OVR_FACTOR[n]
for SINAMICS S120:
p9532[0...15]: SI motion SLS (SG) override factor (Control Unit)
Application example
For grinding applications, the limit value for the safely reduced speed can be ad-
justed to the variations in the grinding wheel peripheral speed using the SG over-
ride.
Activating
The following prerequisites must be fulfilled before the function can be used:
S The function is enabled via MD 36901/parameter p9501:
$MA_SAFE_FUNCTION_ENABLE, bit 5/SI motion enable, safety functions, bit 5
S The SBH/SG function is enabled via MD36901/parameter p9501:
$MA_SAFE_FUNCTION_ENABLE, bit 0/SI motion enable, safety functions
(Control Unit), bit 0
S The required SGEs "SG override selection bits 3, 2, 1, 0" have either been
completely or partially configured
S The SG override factors have been entered into the appropriate MD 36932/
parameter p9532: $MA_SAFE_VELO_OVR_FACTOR[n]/p9532[0...15] SI
motion SLS (SG) override factor (Control Unit)
S Safely reduced speed 2 or 4 has been activated
Changing–over an SG override
SG override values are changed–over subject to the same conditions as those that
apply to speed limit values.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
© Siemens AG 2008 All Rights Reserved
05.08