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

03.06
Defining SG override factors
The SG override factors themselves (percentage values) are defined using the fol-
lowing machine data:
for 840D sl:
MD 36932: $MA_SAFE_VELO_OVR_FACTOR[n]
for SINAMICS S120
p9532[n]: SI motion SG override factor
6.5.5

Example: override for safely-reduced speed

Task assignment
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
selection selection
Bit 1 Bit 0 Bit Bit
3 2
0 0 x x
0 1 0 0
– " – 0 0
– " – 0 0
– " – 0 0
1 0 x x
1 1 0 0
– " – 0 0
– " – 0 0
– " – 0 0
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").
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Effective speed limit value
Bit Bit
1 0
x x Limit value 1
0 0 Limit value 2 with override stage
0
0 1 Limit value 2 with override stage
1
1 0 Limit value 2 with override stage
2
1 1 Limit value 2 with override stage
3
x x Limit value 3
0 0 Limit value 4 with override stage
0
0 1 Limit value 4 with override stage
1
1 0 Limit value 4 with override stage
2
1 1 Limit value 4 with override stage
3
Safety Functions Integrated in the System/Drive
6.5 Safely-reduced speed (SG)
Assumptions for the example
1,000 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
6-147