MOTOR CONTROLLERSElectrical Distribution SystemsFigure 9 Single Phase Manual ControllerMagnetic ControllerA large percentage of controller applications require that the controller be operated from a remotelocation or operate automatically in response to control signals. As discussed, manual controllerscannot provide this type of control; therefore, magnetic controllers are necessary.Basic operations using a magnetic controller, such as the closing of switches or contacts, areperformed by magnetic contactors. A magnetic controller is one that will automatically performall operations in the proper sequence after the closure of a master switch. The master switch (forexample, float switch, pressure switch, or thermostat) is frequently operated automatically. Butin some cases, such as pushbuttons, drum switches, or knife switches, the master switch ismanually operated. Figure 10 shows a typical magnetic controller and its component parts.ES-15 Page 16 Rev. 0
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