HAT THE RECENT Hannover Fair, ABB announced a range of low-voltage AG drives aimed at pump and fan applications. The IP20-protected drives, with ratings from 0.37-22kW, have built-in PID controllers that respond to changes in pressure, flow and other variables, eliminating the need for external PLCs and helping to save energy. The drives incorporate several dedicated pump and fan control functions. One, for example, modulates the speed of a main pump or fan and brings any auxiliary pumps or fans on line as needed. The drives can also switch between pumps or fans to ensure that they are all used to equally over the long term.
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