Siemens SINUMERIK 840C Installation Instructions Manual page 231

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.4 Axis-specific MD 1 (axial data 1)
252*
Default value
1 666
When specifying the K factor, attention must be paid to the fact that the gain factor for the
V
entire position control loop is dependent on other controlled system parameters. Strictly
speaking, a distinction must therefore be made between the "required K
specified in NC MD 252*) and the "actual K
control loop parameters have been correctly attuned to one another are these two K
identical. The parameters in question are:
• Max. velocity (MD 280*)
• Speed setpoint adaptation MD 256*, 260*
• Tacho compensation on the speed controller
• Tacho-generator on the drive
An input value of 1 666 is equivalent to a K
The position controller loop is broken if the value 0 is entered.
Note:
Axes which are to interpolate and perform a machining operation together must exhibit
precisely the same gain in the position control loop (i.e. at the same speed they must exhibit
the same following error = 45 degree inclination).
Any deviations will result in contouring errors!
Only axes which never contribute to continuous-path operation may be defined with different
values.
The actual K factor can be checked on the basis of the following error (in the Service
V
displays). Note that the drift must be compensated before carrying out the check.
Note:
As from SW 4, for 8 parameter sets
256*
Default value
10 000
The maximum load velocity is calculated from the maximum motor speed, the mechanical gear
and/or the spindle pitch.
with r = transmission [1]
n = max. motor speed [
max
s = spindle pitch [mm]
For linear axes: max. load velocity = n
For rotary axes: max. load velocity = n
See Section Axis (Analog) and Spindle Installation.
Note:
As from SW 4, for 8 parameter sets
6–46
K factor
v
Lower input limit Upper input limit
0
80 000 (as from SW 5)
factor" (obtained at the machine). Only when all
V
factor of 1.
V
Scaling factor max. velocity
Lower input limit
1
V
/ ]
min
· s · r
max
· r · 360 degrees
max
©
Siemens AG 1992 All Rights Reserved
10 000
factor" (which is
V
Upper input limit
mm
99 999 999
–––– –––– ––––
min
SINUMERIK 840C (IA)
09.95
Active on
NC Stop
Units
-1
0.01 s
factors
V
Active for all
channels of
mode groups
in STOP
Units
inch degr.
min min
6FC5197- AA50