Danfoss MCO 305, Design Manual, Page: 36 / 242

MCO 305 Design Guide
__ Functions and Examples __
36
MG.33.L4.02 – VLT
®
is a registered Danfoss trademark
†
Stamping of Boxes with Use-by Date
The following example explains step by step how to
edit the curve for this application of the CAM con-
trol and then how to incorporate it into your control
program. A roller is supposed to stamp an inscrip-
tion with a length of 10 cm on cardboard boxes.
The stamp corresponds to a roller section of
120 degrees. 60 cardboard boxes are transported
on the conveyor belt per minute. The cardboard
boxes are always transported on the conveyor belt
at exactly the same distance from each other (e.g.
by means of a mechanical set pattern). During the
printing process, the stamping roller and the
cardboard box must run in sync:
Conveyor belt
= Master
Stamping roller = Slave
Master positions
[1/10 mm]
e75MD001.10
Area where master and slave
must be in sync
Slave positions [degrees]
stamp beginning 120°, end 240°
4000
0
2500 1500
†
How to Edit the Curve Step by Step
1. Set the FC 300 with the required parameters.
2. Select this CNF file, APOSS will then automatically open the selected file as well as the CAM-Editor .
3. Determine the gearing factor of the master in MU units.
The input should be possible in 1/10 mm resolution.
The drive is connected with the conveyor belt by means of a gearing of 25:11; i.e. the motor makes 25,
the drive pulley 11 revolutions.
Gearing factor = 25/11
Incremental encoder directly on the master
drive; encoder resolution = 4096
The drive pulley has 20 teeth/revolution,
2 teeth correspond to 10 mm, thus 1
revolution corresponds to = 100 mm conveyor
belt feed or 1000/10 mm.
Thus, the scaling factor is 1000.
MU 1 qc
Factor Scaling
4 Resolution Encoder Factor Gearing
Slave Syncfactor
Master Syncfactor
11 - 33 par.
10 - 33 par.
MU 1 qc
55
2048
MU 1 qc
11 1000
4 4096 25
qc
1000
4 4096 25/11
u
u
Enter these values in the index card
o
Synchronization (the selected units should always be whole
numbers):
par. 33-10 Syncfactor Master = 2048
par. 33-11 Syncfactor Slave = 55
4. Enter the gearing factor of the slave in UU units:
Gearing factor = 5/1
Encoder resolution (increm. encoder) = 500
One revolution of the roller is 360 degrees. We
are going to work with a resolution of
1/10 degrees. This means that we are dividing
one revolution of the roller into 3600 work units:
Scaling factor = 3600
UU 1 qc
Factor Scaling
4 Resolution Encoder Factor Gearing
Denomintor Unit User
Numerator Unit User
11 - 32 par.
12 - 32 par.
UU 1 qc
9
25
UU 1 qc
3600
4 500 5
qc
3600
4 500 5/1
Enter these whole number values in the index card o Encoder:
par. 32-12 User Unit Numerator = 25
par. 32-11 User Unit Denominator = 9
5. Determine a whole number factor for the intervals in the index card o Curve Data so that the Fix points
are on the interpolation points. Set this using the “Set” button.
A complete cycle length of the master is 400 mm; this corresponds to 4000 MU.
The o Number of Intervals = 40 results in a reasonable interval time of 25 ms.