Lenze EVS93xx CrossCutter - Manual (Page 19)

Cross Cutter
Features of the "Cross Cutter" prepared solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN 2-5
TIP!
There are a variety of mathematical transfer functions for the motion characteristic in the
asynchronous section (see, e.g. VDI 2143). The prepared solution only takes account of
second order polynomials (linear speed ramps), fifth order polynomials and the sloping sine
line.
Selecting a cutting length x
max
a lot longer than the synchronous cutting length (x
circumference
) is
considered to be a special case. In this situation, the speed of the knife drum can fall to values
less than zero, causing the knife drum to move in opposition to the direction of material flow:
y
t
y
max
V
t
V
synchron
t
1 t
cycle
t
1
t
cycle
t
asynchron
t
asynchron
t
synchron
t
synchron
cutting
phase
cutting angle
t
2
t
2
t
3
t
3
y
end