Siemens SINUMERIK 840D sl Function Manual page 151

05.08
Table 6-12
SG selection
Bit 1
= 0
= 0
= 1
= 1
Note:
1) The SG limit values SG2 and SG4 can be finely graduated using the SG override (see
Chapter 6.5.4, "Override for safely reduced speed".
The active SG stage is displayed using SGA "SGA active bit 0" and "SGA active bit 1".
Changing–over the speed limit values
A changeover from a lower to a higher speed limit value takes effect instanta-
neously without any delay.
When changing–over from a higher to a lower limit value, then a delay time is
started that is parameterized using the machine data
(refer to Figure 6-12, "Timing when changing–over from a higher to a lower speed
limit").
for 840D sl:
MD 36951: $MA_SAFE_VELO_SWITCH_DELAY
for SINAMICS S120:
p9551: SI motion SLS (SG) changeover delay time (Control Unit) /
The axis/spindle must be braked sufficiently during the delay time so that it has
reached the reduced speed that is below the new limit value when the delay time
expires. However, if the actual speed is higher than the new limit value when the
time has expired, an appropriate alarm is output with the configurable stop re-
sponse.
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Safety Functions Integrated in the System/Drive
Selecting speed limit values for SGs
SGE
SG selection Description
Bit 0
= 0 Speed limit value for SG1 active
= 1 Speed limit value active for SG2
= 0 Speed limit value for SG3 active
= 1 Speed limit value active for SG4
6.5 Safely reduced speed (SG)
1)
1)
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