Abstract
Pumps or fans often exist in multiples or configurations that are interdependent within a process Without applying a drive to each unit, it, is still possible to achieve the benefits of drive control by taking advantage of synchronization and using one drive to control several pumps within a process. Several benefits may be realized while keeping capital outlays reasonable. Possible applications must be identified and evaluated separately to ensure economic payback and benefits. The method and configuration chosen will impact the evaluation. A synchronous transfer system of pump control for series or parallel arrangements of pumps can be very beneficial from process or economic standpoints. Along with reduced initial capital outlay and installation costs, savings can also be realized in operating costs since the process is now continuously variable and does not require throttling. The AFD will provide improved process control as well as the benefit of soft starts and reduced voltage drops. A closed transition is preferred for synchronizing and desynchronizing to provide accurate phase alignment at the moment of connection to the second source. Minimizing the voltage phase difference will reduce current and torque transients important to providing a long motor life.
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