6 mk_const_rel_mm, 7 mk_const_rel_inch, 8 mk_konturfehler – Lenze ETC Motion Control User Manual
Page 195: Mk_const_rel_mm, Mk_const_rel_inch, Mk_konturfehler, Machine constants
Machine constants
Software configuration
MK_CONST_REL_MM
4.3
4.3.6
l
195
EDSTCXN EN 2.0
4.3.6
MK_CONST_REL_MM
This machine constant defines the input resolution in the metrical system.
1, i.e. 1 mm / unit, is used as the default. If all inputs and outputs of the
control are to be specified in
mm units, enter the value 0.001.
4.3.7
MK_CONST_REL_INCH
This machine constant defines the input resolution using the inch system.
25.4 is the default value, i. e. 25.4 mm / unit. If you prefer 1/10th inch units
for the input and output of the control, enter 2.54 here.
4.3.8
MK_KONTURFEHLER
This machine constant defines the maximum permissible (calculated)
deviation [mm] from the programmed path if the profile transition is
non−tangential.
Together
with
MK_RADIUS_B_BEWERTUNG
and
MK_BAHNBESCHL, it determines to which extent the speed on the path at
a corner must be reduced if Look Ahead (G60) is switched on.
In the process, the control determines the maximum speed at a corner as
follows:
B
R
=
V
⋅
max
V
max
max.: speed at the corner [mm/s]
R: Radius of a tangential circular arc with a distance of MK_KONTURFEHLER
between the programmed reference points and the vertex of the circular arc
[mm]
B: Set path acceleration (MK_BAHNBESCHL, G201) [mm/s
2
]
The speed is also limited by the maximum permissible jerk (increase of
acceleration per time unit):
3
2
K/T
B
R
=
V
⋅
⋅
max
T: Time constant for the permissible increase of acceleration [s]
MK_T_BAHNBESCHL
K: Value of MK_RADIUS_B_BEWERTUNG
In general, the following applies: the smaller the value in the MC, the smaller
the resulting speed in corners and the higher the path quality. The same
applies in the reverse case.