The Contrac series continuous electric variable-speed actuators are the ideal solution for highly precise, continuous position regulation of injection control valves and reduce operating costs.
The intelligent field devices of Contrac actuator systems are based upon single board computer of conventional rotary and linear actuators. The name Contrac is an amalgamation of the words 'control' and 'actuator'. The actuator system sets itself apart with continuous positioning, precise control, long service intervals, overload protection in end positions without torque-dependent cut-off as well as its high protection class. The single board computer series comprises tried and tested mechanical components combined with microprocessor electronics and is compatible with fieldbuses as well as conventional control methods. The embedded systems devices offer diagnostic options and parameter settings are performed via a graphic user interface. The systems are self-monitoring and offer fail-safe back-up of technical data.
refer to: http://www.power-eng.com/articles/print/volume-117/issue-8/features/opportunities-to-improve-efficiency.html
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