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Mounting and pneumatic installation
Festo – P.BE-CPX-CMAX-SYS-EN – en 2017-09b – English
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3.3.4
Load
For good positioning behaviour, the CMAX must be adjusted to the load. The total load represents the
complete load to be moved with the positioning drive, including the weight of the piston and the slide.
The total load consists of the following:
Load
Description
Base load
Total of all loads/mass moment of inertia of moved components that are
permanently connected to the piston rod/rotary vane or the drive slide of the
cylinder/semi-rotary drive and cannot be changed (e.g. piston/piston rod and
slide, workpiece gripper or gripper unit).
Payload
An additionally moved load of a workpiece or of the load to be transported
which, compared to the constantly present base load, is moved only when the
axis is loaded.
With semi-rotary drives, the payload equals the mass moment of inertia (MMI) of
the workpiece related to the axis of rotation (MMI of the payload in kgcm²).
If the payload is permanently connected to the drive, the load can also be added
to the base load. The payload is then set to zero.
Tab. 3.2
There is a maximum and a minimum permissible total load. The permitted mass load depends on the:
–
drive type
–
drive diameter
–
mounting position
–
operating pressure
Make sure that the effective total load in all load situations:
–
is not less than the minimum permissible total load. This applies in particular for the load
without payload (
è
–
does not exceed the maximum permissible total load (
è
Note
A pneumatic positioning axis should be operated with at least the minimum total load
(
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www.festo.com/catalogue). If necessary, this minimum mass load must be ensured
through the use of an additional weight.
The payload present can be specified for each positioning command. The controller setting of the CMAX
can thus be adjusted to various loads.
Note
If the total load varies from positioning command to positioning command, e.g. due to
changing workpieces, the payload should be adapted in the positioning command. For
additional information
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Communication profile description, P.BE-CPX-CMAX-CONTROL-... .