6 NC Machine Data (NC MD), NC Setting Data (NC SD) 09.95
6.7 Axis-specific MD 2 (axial data 2)
Servo enable switch-off delay
1224*
Default value Lower input limit Upper input limit Units
200 0 1 000 ms
Active on
NC Stop
The speed enable (servo enable) on the servo loop is revoked after the set delay time has
elapsed. The servo enable is available on the servo loop once per axis/spindle and is allocated
by the control on a mode group specific basis.
Action of the time delay entered:
1. After the interpolater has reached the programmed position, the clamping tolerance
(MD 212*) is activated after the set time delay has elapsed. At this instant, the following
error must therefore be less than the clamping tolerance. The time must be set to be long
enough for the maximum following error (rapid traverse) to be removed. Failure to do this
causes the servo enable on the servo loop to be revoked and alarm 112* (zero speed
control) is issued.
This applies only if NC MD 372* (zero speed control delay) is set to 0.
2. Time delay for removing the servo enable on the servo loop after ”EMERGENCY STOP”
and other errors leading to immediate stoppage of the axes (e.g. contour monitoring).
3. Time delay for removal of servo enable on the servo loop when the servo enable of an
axis has be revoked by the PLC.
Modification of MD 1224* does not take effect until ”POWER ON” and replaces the axis-
independent MD 156.
Backlash compensation 2nd measuring system 1)
1228*
Default value Lower input limit Upper input limit Units
0 - 16 000 16 000 units (MS)
Active on
NC Stop
Active: At once
MD 1228* has the same significance/unit as MD 220* (backlash compensation first measuring
system).
A different backlash occurs in this system if the second measuring system is connected in a
different way. When the measuring system is switched over, the associated compensation
value is always activated:
Measuring system 1 active: MD 220* active
Measuring system 2 active: MD 1228* active
Compensation value 1)
1232*
Default value Lower input limit Upper input limit Units
0 0 16 000 0.01 %2)
0.1 (mV)
Active on
NC Stop
_______
1) As from SW 2
2) As from SW 3
6–164 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)