Siemens Sinumerik 840D sl Function Manual page 154

Safety functions integrated in the system/drive
6.5 Safely reduced speed (SG)
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".
Changeover of speed limits
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
(see Fig. 6-13, "Timing when changing--over from a higher to a lower speed limit").
for 840D sl:
MD36951 $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
response.
6-154
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Selecting speed limit values for SGs
SGE
SG selection Meaning
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
1)
1)
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10/15