Festo CPX-CMAX, Описание

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2 Product overview
Festo – P.BE-CPX-CMAX-SYS-EN – en 2017-09b – English 17
2.3.3 General instructions on use of the CMAX
Fundamentals for planning and execution of positioning systems with CMAX
In the CPX terminal, a maximum of 8 CMAX modules are permitted - dependent on the bus node
(
è
Tab. 1.2).
The maximum permitted length (total) of the used connecting cables KVI-CP-3-... of the axis string is
30 m (total length CMAX – VPWP – sensor interface or displacement encoder;
è
Fig. 2.1).
Attach drive backlash-free to the application and displacement encoder.
Comply with minimum load (
è
Section 3.3.4).
Comply with requirements for compressed air supply (
è
Section 3.6.1 and 3.6.2)
Take into account emergency stop processing of an axis from the start (additional pneumatic cir­
cuitry
è
A.3).
Always select tubing between cylinder and VPWP valve to be as short as possible. A tube length of
60 % of the cylinder stroke length is optimal (max. tube length = cylinder stroke length).
Avoid elbow connectors as much as possible. Elbow connectors reduce the flow by up to 30 %. This
reduces the possible top speed and maximum acceleration.
Take into account power requirements of the components used. For example, the max. current con­
sumption of the valve VPWP is up to 1.35 A (valve drive 1.2 A, logic 0.15 A) - without current con­
sumption for the optionally usable outputs (
è
Section 4.4.1).
To achieve good positioning behaviour:
Feed compressed air at the cylinder on both sides.
Comply with stroke reduction in accordance with the catalogue specifications.
Stroke reduction is 10 ... 35 mm per side – dependent on the cylinder (
è
www.festo.com/catalogue).
Tip: The best positioning behaviour is achieved when only 80 % of the cylinder stroke is used and 10 %
remains on each side as reserve.
The CMAX is not suitable for:
– cylinder lengths > 2000 mm
– cylinder lengths > 50 mm
– repetition accuracy < ±0.2 mm
– speeds < 30 mm/s
– positioning strokes < 10 mm
– force values that lie underneath the friction of the system
2.3.4 CMAX in the CPX terminal
The CMAX is integrated into a CPX terminal as a CPX module and is controlled by the CPX bus node or
control block via the internal bus using 8-byte module output data and 8-byte module input data.
Information on control and parameterisation of the CMAX over the CPX node
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Communication profile description, P.BE-CPX-CMAX-CONTROL-... .