B. Basic controlling principles
B−18
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
B.4 Taking into account the load
The controller of the CMAX needs the specifications concern
ing the moving masses to be as precise as possible. This
must be taken into account by means of special parameters,
see Tab.B/12.
Parametrising the masses
1
2
1
Moving mass without workpiece (PNU 1142)
This is the mass of the loading device fixed to the slide. This
mass must always be moved by the drive (minimal mass to be
moved).
2
Workpiece mass (PNU 605)
If the drive also has to move workpieces of different weights,
this variable share must be defined as workpiece mass. The
CMAX calculates the sum of both mass data for every posi
tioning process. Parameter 605 is also the default value for
the record list.
Status when switching on (PNU 1143:01)
If a controller is enabled, the last valid workpiece mass is al
ways used. After the first enable after switching on, usually no
workpiece is loaded, so CMAX only takes into account the
basic mass without a workpiece (PNU 1142). This parameter
defines whether the workpiece should also be taken into ac
count when switching on.
0 = Workpiece not loaded when switching on.
The workpiece is only loaded during operation.
1 = When switching on, the workpiece is already in the load
ing device.
Tab.B/12: Parameter concerning the load
Example: Only workpieces of the same mass are transported.
The workpieces are pushed from pos 1 to pos 2, the drive
returns empty. For the return stroke, the workpiece mass is
specified as = 0 in the record list.
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