Siemens SINUMERIK 802C Manual page 83

Example for adaptation of the dynamic response of the Z axis/spindle:
1st gear stage –> parameter block[1],
for spindle–K
for axis Z–K
The searched entry for the Z axis in
MD 32910 DYN_MATCH_TIME [1] = ––––––––
MD 32910 DYN_MATCH_TIME [1] = 0.0960 s
If necessary, for fine adaptation, in practice a more exact value must be determined.
When traversing axis (e.g. Z axis) and spindle, the exact value for POSCTRL_GAIN is dis-
played on the service display.
MD 32900 DYN_MATCH_ENABLE must be set to = 1.
Example: service display for Z axis with POSCTRL_GAIN : 2.437 in 1,000/min
Exact calculation:
MD 32910 DYN_MATCH_TIME [1] =
In practice, this value can be optimized. To this aim, the thread is first tested with compensa-
ting chuck and the calculated values. Then the values should be modified sensitively such that
the difference path in the compensating chuck approximates to zero.
Now, the POSCTRL_GAIN values displayed on the service display for axis and spindle
should be identical.
Note
If MD 32900 DYN_MATCH_ENABLE has been set to "1" for the drilling axis, it should also
be set to "1" for all interpolating axes. This increases the traversing accuracy along the con-
tour. However, the entries for these axes in MD 32910 DYN_MATCH_TIME [n] must be left
at the value "0".
Backlash compensation
Overview
The falsification of axis travel due to mechanical backlash can be compensated (cf. Technical
Manual "Description of Functions").
Funktion
The axis–specific actual value is corrected by the backlash compensation value (MD32450
BACKLASH) with each change of the traversing direction.
SINUMERIK 802C
6FC5 597–3AA20–0BP2 (01.02)
MD 32200 POSCTRL_GAIN[1] = 0.5 is entered,
v,
MD 32200 POSCTRL_GAIN[1] = 2.5 is entered.,
v,
=
1 1
– ––––
K [1] K [1]
v spindle v z
1 1
*
( )
–––– – –––– –––––
0.5 2.5
1 1
*
( )
–––– – –––––––
0.5 2.437
Start-Up
4.7 Commissioning
60
1000
60
= 0.0954 s
–––––
1000
4-83