Siemens SINUMERIK 840C - Manual (Page 245)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 07.97
6.4 Axis-specific MD 1 (axial data 1)
Delay time zero speed monitoring 372*
Default value Lower input limit Upper input limit Units
200 0 1 000 ms
Active on
Reset
NC MD 372* is used to specify the amount of time that is to elapse before zero speed
monitoring (NC MD 212*) is to be activated during the approach to position (set speed=0).
The time must be chosen so as to enable suppression of the largest possible following error.
Failure to specify an appropriate delay time will trigger alarm 112*.
If NC MD 372* is 0, the value defined in NC MD 156 ("Servo enable cutoff delay") is taken as
delay time for zero speed monitoring.
MD 372* Time
S
S
MD 212*
Normal case : S < MD 212*
MD 372* Time
S
S
MD 212*
Error situation : S > MD 212*
S....Following error (contouring error)
Acceleration during emergency retraction
guided by the control
376*
Default value Lower input limit Upper input limit Units
0 0 99 000 000 10 000units/s 2
Active on
You can enter your own acceleration in this MD. An emergency retraction block an thus be
made to respond more quickly.
If the value=0, the acceleration is taken from machine data 276* or from the parameter set for
acceleration.
6–60 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)