Lenze EVS93xx CrossCutter - Manual (Page 257)

Cross Cutter
Appendix
 Prepared Solution Servo PLC / ECSxA 1.1 EN 6-89
Connection example
The following structure will be used to provide a practical illustration of the application of the
Tp_Window function block:
A web with print marks at distances of ∆l = 400 mm is moving forwards at approx. 60 m/min.
The feed motion is detected via an incremental encoder driven via a belt ratio i
master
= 5 : 2 by
one of the feed rolls (diameter Ø
master
= 100 mm). A valid print-mark tolerance window of ∆s =
100 mm wide is to be set in order to prevent any additional print image on the web affecting the
mark sensor.
The required behaviour can be achieved in the following connection using the Tp_Window
function block:
The incremental value for the setpoint print-mark distance (input signal dnCycleLength_p) is
calculated using the following formula:
... 567 , 208607
] / [ 100
] [ 400
2
5
] / . [ 65536
] / . [ 65536 _
=
⋅
⋅ ⋅ =
=
Δ
⋅ ⋅ =
rev mm
mm
rev incr
m
l
i rev incr p gth dnCycleLen
Master
Master
π
The value for the width of the window (input signal dnTpWindowSize_p) is calculated using the
following formula:
... 270 , 62582
] / [ 100
] [ 120
2
5
] / . [ 65536
] / . [ 65536 _
=
⋅
⋅ ⋅ =
=
Δ
⋅ ⋅ =
rev mm
mm
rev incr
m
s
i rev incr p Size dnTpWindow
Master
Master
π
∆l = 400 mm ∆s = 120 mm
i
master
= 5 : 2
m
master
= π
.
100 mm