intelligent motor control centres...!!

MCC means Motor Control Center, a system of distributing power for low voltage motor controllers with a common bus power distribution and removable motor controllers, often called "buckets". There are essentially two MCC systems in use in the world; NEMA, which covers the North American marketplace (where the technology originated) and IEC, which covers essentially the rest of the world. NEMA MCC designs are governed by UL standards, IEC MCCs rely upon IEC and CE standards. The two standards are NOT interchangeable, but are similar.

Intelligent MCCs are just the same thing, except each individual motor controller (and maybe feeders and a main circuit breaker) have serial communications capabilities so that an automation system can directly control and/or monitor them with or without local control interfaces. There are no "official" standards that define that capability however, so it is up to each user and manufacturer to define how much control or monitoring capability they want. Different manufacturers have different internal standards and even within a given manufacturer there may be different versions depending on the part of the world they are being used.

As an example, Siemens, the largest mfr in the world, has the Sivacon MCC system for IEC applications, and the TIASTAR system for the NEMA world. TIA for Siemens stands for Totally Integrated Automation, depicting the use of the intellegent MCC concept. In either case, each motor starter bucket has a device, in Siemens case called a "Simocode" unit, that provides the communications network interface, control functionality and motor protection all in one, so that the only additional control circuitry is the connection to the motor starter contactor coil. Other manufacturers have similar devices, some more or less functional, but the key ingredient is the communications networking of the devices, Without that, they are just plain MCCs. When the entire MCC is pre-wired with these communications network devices, it is called an Intelligent MCC.

Hope that helps.

upto a certain kW rating, the products like TESYS U of telemecanique offer totally coordinated starters ( mpcb + contactor ...integrated ) having communication capability followed by having all the relevant protections

however ,beyond a certain rating the above is not available due to size constraints....now say for higher ratings the availability exists for totally coordinated MPCB + contactor combination ( for any type of starting ...short / long time )...how you prapose the same parameters can be pulled ?

Do you have typical examples of where each form would apply, eg I don't see Form 1 as being used in any industrial facility.

Australia uses IEC 600430-1:1999 as the basis for its standard and has sub-categories Forms 2a, 2b, 3a, 3b, 4a and 4b.

I would like to know typical examples of where each of these sub-categories would be specified. For example, I do not see Form 1 and Form 2a having a place in a heavy industrial installation, and Form 2b may be used for non-essential light and power distribution boards and similar.

I am used to seeing Form 3b for high reliability MCCs such as water treatment facilities. I have no personal experience of seeing Form 4 specified.

If anyone has actual experience in specifying forms 3a, 3b, 4a and 4b I would like to hear from you on typical applications for each.

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