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2013/05/19
 
 
 
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Electro-Mechanical (Relay) Control

EM Control Panel

Electro-mechanical control typically consists of multiple Relays, Timers, and/or Counters wired together on an enclosure panel. Because it essentially supports Boolean-based control, it is often considered to be the predecessor to processor-based systems. Today this approach is common with very simple and small applications. But 50 years ago, this was the primary means of machine control, and it was common to see huge walls of enclosures containing hundreds of relays wired together. 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.

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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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theknode

UL 508A Control Panel Design Guide Eaton E-M Control Panel Click here
H5CX-N: The Timer with the Shortest Body in the Industry Omron Timer Click here
Eaton Evolution Family Eaton   Click here
Eaton EvolutionS Family Eaton   Click here
Eaton EX RT Family Eaton   Click here
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Basics of Motors and Motor Controls Eaton general Click here
Basics of Surge Protection Eaton general Click here
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Distributed Motor Control Eaton   Click here
Basics of Motor Control Starters Eaton Motor Starters Click here
Basics of Soft Starters Eaton Motor Starters Click here
Basics of Relays, Timers and Terminal Blocks Eaton general Click here
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Electronic coils benefits Eaton   Click here
When to replace contacts on Freedom IDEC   Click here
Benefits of using a soft starter for uptime IDEC Motor Starters Click here
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Common Electrical Symbols  Eaton general Click here
IEC, NEC, CSA and UL stds explained  Eaton general Click here
Contact Circuit Protection: Circuits for providing protection from damage to contacts.  IDEC general Click here
Addressing Arc Flash Safety on a University Campus  Eaton   Click here
Understanding Arc Flash Hazards Eaton   Click here
Upgrade your Facility by Practical Steps to Reduce Arc-Flash  Eaton   Click here
Case Study - Bowater Partners with Eaton to Implement Arc Flash Safety  Eaton   Click here
Staying Ahead of the Workplace Safety Curve Eaton   Click here
Upgrade your starters to Electronic Coils save space and energy Eaton Starters, Contactors Click here
Use of IEC Starters in UL, CSA and NEC applications Eaton Motor Starters Click here
Title Manufacturer Products URL
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