Lenze EVS93xx CrossCutter - Manual (Page 75)

Cross Cutter
Features of the "Cross Cutter" prepared solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN 2-61
2.5.8 Length-controlled or mark-controlled operation
The "Cross Cutter" prepared solution supports both length-controlled and mark-controlled
operation.
Length-controlled operation:
Synchronous cross cutter:
In length-controlled operation on the synchronous cross cutter, motion profiles are calculated
online in the target system
1 and this is the only calculation made. Because the profiles are
calculated online in the target system and not in advance on a PC (e.g. using the CamDesigner
software tool), the motion profile can be quickly adapted to meet the needs of the user. In rotary
cross-cutter applications where (in theory) an infinite number of cutting lengths are possible in
particular, the number of motion profiles required usually exceeds the number of motion profiles
that can actually be saved (9300ET/ECS/SWP-CAM: maximum 48 motion profiles). In such
cases, online calculation of cross-cutter motion profiles in the target system offers an
alternative. The cross-cutter motion profile is created in two sections (synchronous phase and
asynchronous phase) which are adapted on the basis of cutting length (see also Chapter 2.2.2).
Asynchronous cross cutter:
In length-controlled operation on the asynchronous cross cutter, a maximum cutting length
corresponding to the circumference of the cutting circle knife applies. This restriction is
necessary to prevent the material to be cut jamming.
Figure 20: Length-controlled operation of a cross-cutter application
1 No calculation in real time!