Siemens SINUMERIK 840C Installation Instructions Manual page 351

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.7 Axis-specific MD 2 (axial data 2)
Filter time constant acceleration determination for quadrant
1256*
Default value
60
This value is usually not altered by the user. The value should only be increased if the
compensation in the smallest speed range is insufficient.
1260*
Feedfwd control factor for rigid tapping (as from SW 2)
Default value
0
A P feedforward control factor can be entered for the axes involved in the function "Rigid
tapping". This machine data has the same meaning as that of NC MD 312*. NC MD 1260* is
only used if NC MD 1320* is not 0.
1264*
Grid spacing / ENDAT measuring step (as from SW 5.4)
Default value
0
The SINUMERIK 840C supports ENDAT absolute encoders where the ratio of grating
pitch/ENDAT measuring step as an integer can be divided by 4. If you enter an incorrect value,
this leads to measuring errors. The input values 0 to 7 are internally processed as the value 4
(default value for rot. EQN 1325). The grid spacing and the ENDAT measuring step must be
taken from the data sheet of the ENDAT absolute encoder.
1272*
Default value
0
The setpoint filter prevents overshooting of positions in the case of a dynamic speed
feedforward control of 100 %.
Note:
As from SW 4, for 8 parameter blocks
Setpoint
Setpoint
filter
6–166
error compensation (as from SW 4)
Lower input limit Upper input limit
0
Lower input limit Upper input limit
0
Lower input limit Upper input limit
0
Setpoint filter time constant
Lower input limit Upper input limit
0
d
dt
Symmetrizing
filter
Actual position value
©
Siemens AG 1992 All Rights Reserved
Units
16 000 1 ms
Units
1 000 0.1 %
Units
16 000
Units
1 000 0.1 ms
Feedforward factor
K
V
6FC5197- AA50
SINUMERIK 840C (IA)
04.96
Active on
NC Stop
Active on
NC Stop
Active on
Power On
-
Active on
NC Stop
+
Setpoint
speed