Electro-Mechanical (Relay) Control

Electro-mechanical control typically consists of multiple Relays, Timers, and/or Counters wired together on an enclosure panel. Electro-mechanical Control is also referred to simply as "Relay Control" perhaps a more accurate term, since solid state Relays, Timers, and Counters have become very common. Today this approach is common with very simple and small applications.

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Key considerations include type of counter (up/down, retentive, etc.), and whether the count value must be easily and frequently changed or monitored.
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A variety of sensors, switches, and other Input devices detect movement, light, temperature, and many other variables. E-M control is typically limited to discrete (or digital) devices.
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Contactors, motor starters, valves, and other Output devices are used to turn on/off motors, lights, heating elements, and other equipment. E-M control is typically limited to discrete (or digital) devices.
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Relays are available in both electro-mechanical or solid state (triac or transistor) types. Considerations include the number and electrical ratings of the contacts (outputs) and coils (input).
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Key considerations include type of timer (on delay, off delay, etc.), whether the time value must be easily and frequently changed or monitored, and timing range.
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