11.03
3 Safety-Related Functions
3.5 Safely-reduced speed (SG)
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-95
For 840D
MD 36951:
$MA_SAFE_VELO_SWITCH_DELAY
For 611 digital
MD 1351:
$MD_SAFE_VELO_SWITCH_DELAY
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.
SG1
V1
SG2
V2
SGEs for SG1
SGEs for SG2
SG1 is active
SG2 is active
Braking time
Timer running
SGH_SGN.DS4
v
t
Delay time
speed switchover
a) Initiation of braking
Fig. 3-15
Timing when changing-over from a higher to a lower speed limit value
The SG function can be de-selected at any speed by activating the SGE
"SBH/SG de-selection".
!
Warning
The delay time must be selected as a function of the distance to the
hazardous location. The speeds to be taken into account (speeds at which
hands/arms are moved for arranging protective equipment) are stipulated in
Safety Standard DIN EN999.
De-selecting SG
