Siemens SINUMERIK 802S, Start-Up

Page: 92 / 174

Start-Up
4.7 Commissioning
4-92
SINUMERIK 802S
6FC5 597–2AA00–0BP2 (01.02)
Determination of value
The dynamic value of the spindle is stored for each individual stage in
MD 32200 POSCTRL_GAIN[n] as the closed–loop gain (K
v
). An adaptation of the axis to
these values is carried out in MD 32910 DYN_MATCH_TIME [n] using the following rule:
1 1
MD 32910 DYN_MATCH_TIME [n] = –––––––– – –––
K
v
[n]s
pindle
K
v
[n]
axis
The entry to be made in MD 32910 requires the time unit s. The values of
MD 32200 POSCTRL_GAIN[n] for spindle and axis must be converted accordingly:
1000
K
v
[n]
spindle
= POSCTRL_GAIN[n]
spindle
––––––
60
1000
K
v
[n]
axis
= POSCTRL_GAIN[n]
axis
––––––
60
When using further gear stages with G331/G332, the adaptation must also be carried out in
these parameter blocks.
Example for adaptation of the dynamic response of Z axis/spindle:
1st gear stage –> parameter set[1],
Supposed, for spindle K
v,
MD 32200 POSCTRL_GAIN[1] = 0.5 is entered,
and for Z axis K
v,
MD 32200 POSCTRL_GAIN[1] = 2.5 is entered.
The searched entry for the Z axis in
1 1
MD 32910 DYN_MATCH_TIME [1] = –––––––– – ––––
K
v
[1]
spindle
K
v
[1]
z
1 1 60
=
(
–––– – ––––
)
*
–––––
0.5 2.5 1000
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 displayed 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:
1 1 60
MD 32910 DYN_MATCH_TIME [1] = (
–––– – –––––––
) *
–––––
= 0.0954 s
0,5 2,437 1000
In practice, this value can be optimized. To this aim, first the thread is tested with compensa-
ting chuck and the calculated values. Then the values should be modified sensitively so that
the difference path in the compensating chuck approximates to zero.
Now, the same values should be displayed for axis and spindle for POSCTRL_GAIN when
tapping.