Danfoss MCO 305 Design Manual page 39

MCO 305 Design Guide
Printing of Cardboard Boxes with Marker Correction
If the boxes are not always transported at the
exact same distance from each other, markers will
be required that can recognize a box and correct
the synchronization.
The following section describes how you can adapt
the curve of the previous example to this
application.
Again, a roller is supposed to stamp an inscription
with a length of 10 cm on cardboard boxes. A
maximum of 60 boxes are transported on the
conveyor belt per minute. During the printing
operation, both the stamping roller and the box
must run in sync.
How to Edit a Curve for Synchronization with Marker
1. Steps 1 to 9 are the same as in the previous example.
10. Define the point pairs for the engaging and
disengaging in the list → Start-Stop Points. We
make the assumption that engaging takes
place at the beginning of the box and disenga-
ging is to take place until the end of the box.
11. In the index card → Curve Data, determine the position in which the roller should stop if no other Slave
Stop Position is defined in the program.
The roller always needs to return to the position 0 degrees: → Slave Stop Position = 0
12. The photoelectric beam (external marker) has a distance of 237.5 mm from the processing point
(= stamp touches the cardboard box) and detects the beginning of the box (corresponding to master
position 1000). The marker distance is therefore 2375. Enter this value in the index card
→ Synchronization and define the permitted tolerance for the appearance of the markers and the
external marker type = 2 for the master.
par. 33-17 Master Marker Distance
par. 33-21 Master Marker Tolerance Window
par. 33-19 Master Marker Type
Enter the master position in the index card → Curve Data:
Master-Marker-Position
__ Functions and Examples __
®
MG.33.L5.02 – VLT is a registered Danfoss trademark
= 2375
= 200
= 2
= 100
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