Example: Override For Safely Reduced Speed - Siemens Sinumerik 840D sl Function Manual

Safety functions integrated in the system/drive
6.5 Safely reduced speed (SG)
Defining SG override factors
The following machine data are used to define the SG override factors themselves
(percentage values):
for 840D sl:
MD36932 $MA_SAFE_VELO_OVR_FACTOR[n]
for SINAMICS S120
p9532[n] SI Motion SLS (SG) override factor (Control Unit)
6.5.5

Example: Override for safely reduced speed

Task
When safely reduced speeds are selected, the speed limit values must be set as
follows.
Table 6-16 Application example of how override is used for safely reduced speed
SGE SG SGE override
selec- selection
tion
Bit Bit Bit Bit Bit
1 0 3 2 1
0 0 x x x
0 1 0 0 0
-- " -- 0 0 0
-- " -- 0 0 1
-- " -- 0 0 1
1 0 x x x
1 1 0 0 0
-- " -- 0 0 0
-- " -- 0 0 1
-- " -- 0 0 1
Notes:
x: Signal status is optional since override values are not effective for SG1 and SG3
SGEs "SG override selection bit 3 and bit 2" are not required to select an SG override -- i.e. they do not
need to be configured (they are internally set to "0").
6-162
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Effective speed limit value
Bit
0
x Limit value 1
0 Limit value 2 with override stage 0
1 Limit value 2 with override stage 1
0 Limit value 2 with override stage 2
1 Limit value 2 with override stage 3
x Limit value 3
0 Limit value 4 with override stage 0
1 Limit value 4 with override stage 1
0 Limit value 4 with override stage 2
1 Limit value 4 with override stage 3
Assumptions for the example
1000 mm/min
100 % = 2000 mm/min
80 % = 1600 mm/min
50 % = 1000 mm/min
30 % = 600 mm/min
4000 mm/min
100 % = 5000 mm/min
80 % = 4000 mm/min
50 % = 2500 mm/min
30 % = 1500 mm/min
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10/15