Relay/timers and contactors are used in a sequence motor control circuit to switch on motors sequentially, meaning that one motor cannot start before certain other motors have started. In this lesson, we'll talk about utilizing contactors and timers to regulate the sequence of events.
Figures 1 and 2 depict a sequence motor control circuit diagram with three motors, three contactors, three overload blocks, two timer relays, a start push button, a stop push button, a triple pole breaker, and a triple isolator..png)
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Figure 2: Power Circuit |
Each device serves a different purpose:
- Contactors: The contactors are used to turn on and off the motors.
- Timers: Following the energization of contactor 1, timers are utilized to energize contactors 2 and 3 sequentially.
- Overload Blocks: When a high-current condition arises as a result of a ground fault, short circuit, phase failure, or mechanical jamming, an overload block turns off electricity to the motors. They are an affordable approach to prevent downtime for the repair or replacement of motors that have failed due to high currents.
- Start Push Button: The circuit is powered by pushing the start button.
- Stop Push Button: The circuit is completely de-energized with the stop push button.
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