![]() This can arise when a number of emergency stop positions might be required in a plant. They have been labelled ‘start 1’, ‘start 2’, ‘stop 1’ and ‘stop 2’ for clarity.įigure 1 Two start and stop control positions in a circuitĪ variation on the control circuit in Figure 1 is the provision of only one start position with multiple stop positions. ![]() As is usual, the start push-buttons are normally open and the stop push-buttons are normally closed. In Figure 1 there are two start and two stop push-button switches. To stop or de-energize the circuit extra stop push-button switches are placed in series with the first. To provide extra start positions, all that is needed is to connect extra start push-buttons in parallel with the first. It is easier to press a button rather than operate a toggle or turn a handle. The stop and start push-button switches, in motor and other control circuits, are convenient ways to operate circuits. ![]()
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