Siemens SINUMERIK 802C base line Technical Manual page 79

Determination of value
SINUMERIK 802C base line
Start-Up
With active function G331/G332, parameter block n (0...5) of the axis of MD
32910 becomes automatically active, which acts corresponding to the gear
stage for the spindle. The gear stage is dependent on the spindle speed with
M40 or is directly set by M41...M45 (see also Section 4.5.3 Start-up of the
spindle).
Number
32900 Dynamic response adaptation
32910 Time constant of dynamic adaption (control
parameter set no): 0...5
The dynamic value of the spindle is stored for each individual stage in MD
32200 POSCTRL_GAIN[n] as closed-loop gain. An adaptation of the axis to
these values must be made in MD 32910 DYN_MATCH_TIME [n] in
accordance with the following instruction:
MD 32910 DYN_MATCH_TIME[n] =
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:
K [n] = POSCTRL_GAIN[n]
v spindle
K [n] = POSCTRL_GAIN[n]
v axis
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 the Z axis/spindle:
1st gear stage -> parameter block[1],
for spindle-K MD 32200 POSCTRL_GAIN[1] = 0.5 is entered,
v,
for axis Z-K MD 32200 POSCTRL_GAIN[1] = 2.5 is entered.,
v,
The searched entry for the Z axis in
MD 32910 DYN_MATCH_TIME[1] =
MD 32910 DYN_MATCH_TIME[1] =
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:
MD 32910 DYN_MATCH_TIME[1] =
Explanation
1
Kv[n] Spindle
1000
-----------
spindle
60
1000
-----------------
axis
60
1
Kv[1]Spindle
1 1
(
0.5 2.5
1 1
(
0.5 2.437
Start-Up
Default Value
0
0.0
1
Kv[n] axis
1
Kv[1] z
60
x = 0.0960s
)
1000
60
)
x 0.0954s
1000
4-41