You can select web guiding products that best fit the technology utilized on your web.  With the most comprehensive line of guiding equipment, Fife has solutions for Electromechanical, Pneumohydraulic and Electrohydraulic technologies.  There are three different basic types of automatic guiding control systems: 

Electromechanical Systems
In and electromechcanical system, an electronic sensor monitors the lateral position of the web.  The sensor signal is transmitted directly to the processor.  The processor then sends a signal, proportional to the amount of error detected by the sensor, to the DC drive motor on the electromechanical actuator.  The actuator positions the guide structure, which moves the web to the correct lateral position in the sensor.  These systems are especially attractive for applications demanding high frequency response and where hydraulics and pneumatics are not desirable.
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Pneumohydraulic
All pnuemohydraulic systems are closed-loop, Type 1 proportional control systems; this means the correction output velocity is opposite and in proportion to the error detected. 
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Electrohydraulic Systems
The two electrohydraulic types function in a similar manner.  A sensor either electronic or pneumatic monitors the lateral position of the web.  The sensor signal is transmitted either directly to the power unit servo valve (PneumoHydraulic systems) or to a processor, which sends a signal to the power unit servo valve (ElectroHydraulic systems).  Hydraulic output from the power unit through the servo valve, proportional to the lateral error of the web, positions the guide structure, which moves the web to the correct lateral position in the sensor.   These systems are attractive for extremely heavy loads and harsh environments. 
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