L1 L2 L3 OL OL Motor OL R, Control Transformer Forward Reverse Stop OL R R FIG. 21-6 Elementary diagram of the reversing starter shown in Figure 21-1.The mechanical, push-button, and auxiliary contact interlocks are indicated. Copyright © Cengage Learning®. L1 L2 L3 OL OL Motor OL R, R, Control Transformer Forward Reverse Stop OL НЕ R FIG. 21-6 Elementary diagram of the reversing starter shown in Figure 21-1.The mechanical, push-button, and auxiliary contact interlocks are indicated. Copyright © Cengage Learning.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.