Danfoss MCO 305 Design Manual page 42

MCO 305 Design Guide
Thus, it would be better to install the sensor in such a way that the distance to the processing point is either
smaller or substantially larger than one master cycle length; here, for example, at a distance of 3900. Then
it is possible to correct from 2500 to 1000.
Alternatively, the sensor could be installed further away, for example at a distance of 7900; this has the
same effect as if the sensor had been installed at distance – master cycle length (7900 – 4000), i.e. 3900 in
front of the processing point. This allows enough time to correct the synchronization.
If this cannot be done mechanically, then the values must be manipulated somewhat in order to avoid the
solution with the buffer. Please proceed as follows:
Subtract a value x from the actual distance so that the distance becomes < than the master cycle length,
for example 4100 – 200 = 3900. You also subtract the value x from the master position, i.e. 1000 – 200 =
800.
Enter both values in the index cards: → Synchronization and → Curve Data:
par. 33-17 Master Marker Distance
Master Marker Position
Since no buffer is generated now, it would be possible to correct from 2500 to 800, for example
Slave Synchronization with Marker
In the following example, the conveyor belt is the
slave and the stamp roller the master, since the
take-up and delivery of the dye must be continuous
for a uniform printing process. A maximum of
20 cardboard boxes are transported on the conve-
yor belt per minute. The distance of the boxes is
not larger than one master cycle length. Stamp
roller and box must run in sync during the printing
operation: see figure.
In contrast to the synchronization with master
marker correction, here the slave position is being
corrected instead of the curve.
42
__ Functions and Examples __
= 3900
= 800
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