Machinery downtime during normal shift operations is very costly due to lost production, but it is also avoidable. Preventative maintenance systems are being used to improve the operating efficiency of machinery used in factories, power plants, mining, and many other operations. Diagnostic electronics, used in newer preventative maintenance programs, monitor the operating parameters of the machine. For example, a roller mill may have several large electric motors and rollers, all of which have bearings, a hydraulic pump, and a variety of hydraulic actuators. A preventative maintenance system for this type of equipment could include electronic monitoring equipment to measure bearing vibration and temperature, hydraulic fluid pressure and temperature, and motor temperature.
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