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Motor control

Power distribution systems used in large commercial and industrial applications can be complex. Power may be distributed through switchgear, switchboards, transformers, and panelboards. Power distributed throughout a commercial or industrial application is used for a variety of applications such as heating, cooling, lighting, and motor-driven machinery.

Basics of Motor Control Centers - SIEMENS (on photo: New Motor Control Center and power distribution board up to 7000 amperes)
Basics of Motor Control Centers – SIEMENS (on photo: New Motor Control Center and power distribution board up to 7000 amperes)

Basic Motor Control

Wherever motors are used, they must be controlled.

Basic motor control
Basic motor control

In Basics of Control Components you learned how various control products are used to control the operation of motors.

The most basic type of AC motor control, for example, involves turning the motor on and off. This is often accomplished using a motor starter made up of a contactor and an overload relay.

The contactor’s contacts are closed to start the motor and opened to stop the motor. This is accomplished electromechanically using start and stop pushbuttons or other pilot devices wired to control the contactor.

The overload relay protects the motor by disconnecting power to the motor when an overload condition exists. Although the overload relay provides protection from overloads, it does not provide short-circuit protection for the wiring supplying power to the motor. For this reason, a circuit breaker or fuses are also used.

Typically one motor starter controls one motor. When only a few geographically dispersed AC motors are used, the circuit protection and control components may be located in a panel near the motor.


Motor Control Centers (MCC)

In many commercial and industrial applications, quite a few electric motors are required, and it is often desirable to control some or all of the motors from a central location. The apparatus designed for this function is the motor control center (MCC).

Motor control centers are simply physical groupings of combination starters in one assembly.

A combination starter is a single enclosure containing the motor starter, fuses or circuit breaker, and a device for disconnecting power.

Other devices associated with the motor, such as pushbuttons and indicator lights may also be included.

Title:Basics of Motor Control Centers – SIEMENS
Format:PDF
Size:4.3 MB
Pages:72
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Basics of Motor Control Centers - SIEMENS
Basics of Motor Control Centers – SIEMENS

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31 Comments


  1. carina
    May 15, 2023

    I want to share the latest technology trend of the motor control center


    • Emmanuel
      Sep 07, 2023

      I am interested in your services


  2. Edgar De Guzman
    Mar 12, 2023

    Do we require the use of energy meter per MCC?


  3. JUSTIN ORDOÑEZ
    Jan 17, 2023

    Can i place MCC inside Low voltage Switch Room together with other Switchboards


  4. Jean-Christian
    Sep 21, 2022

    What is minimum spaces in between office table and MCC 600V?


  5. sher abbas
    Aug 02, 2022

    dear sir,
    at motor control unit have 1 regulator switch for connecting power supply what’s have name


  6. Kumar Pershad
    May 25, 2022

    Looking for information on MCC.


  7. BERNARDINO TABLADA
    Feb 19, 2022

    i want to set up MCC Panel with 10 motors and panelboard for lightings and power outlet.


  8. Ray Grillot
    Feb 02, 2022

    Are there any set standards for numbering breakers in an MCC?


  9. ranjithkumar j
    Nov 30, 2021

    Hi can you please forward me the 4.3mb Basics of motor control centers because


  10. vusi Dlamini
    Jan 08, 2021

    I need to set up panels for MCC. for 12 electric motors


  11. nexa electrical supplies
    Feb 17, 2020

    thanks for sharing useful information


  12. Rabah
    Nov 08, 2019

    please can you forward me the 4.3 MB Basics of Motor Control Centers


  13. Anthony Millward
    Sep 15, 2019

    What is the maximum ambient operating environment recommended for a MCC?


  14. Mohammed Abid
    Jul 25, 2018

    Very useful article. Thanks a lot.

    What I understood is that the only purpose of the MCC is to group all the motor starters together in one place to reduce the cost of using multiple cables for each motor starter and that, in the MCC, each box has the starter and protection devices for the motor.


  15. deepika
    Feb 13, 2018

    This is a very useful article to understand the basics of MCC. Thanks for uploading


  16. Jon
    Nov 29, 2017

    Hi kindly can I have the link to download this article and thanks


  17. SINHLE
    May 24, 2017

    HEY M WORDERING MAYBE YOU MIGHT HELP, M LOOKING FOR ELECTRIC MOTOR CONTROL CENTRE OR SUPPLIER


  18. Wilman Altamar de horta
    Apr 02, 2017

    Hola cómo están. Muy buena la información, me gustaría que los PDF se pudieran descargar en español.


  19. Ahammad Kabir
    Mar 29, 2017

    This article is excellent. Thank you Evan!


  20. Abu Haneefah
    Dec 22, 2016

    Tanks for the article. It’s a good one. However please I need you to send to me a student project on the design and construction of a 2KVA inverter with a pure sinewave output.


  21. wajid hussain
    Dec 22, 2016

    it is very useful for me
    thanks


  22. Riyas Rasheed
    Oct 25, 2016

    Thanks for your great work.


  23. Angel
    Aug 03, 2016

    Hello, can you guys give us a aproximate cost for a motor control center for a water pumping station?

    Thank you,


  24. Engr. Allen Vunobolki
    Jul 24, 2015

    Hi. Could you please send me the 4.3MB Basics of motor control centres.


  25. matt
    Jul 02, 2015

    hi, just wondering, for panel schamtic design. should the layout of the schamtic be power section, control wiring section and then a BMS section. or should power supplies and control wiring be shown on the same page ?


  26. mohammad alqasem
    Nov 14, 2013

    Thank you , its really helpfull


  27. RichDad
    Aug 08, 2013

    please can you forward me the 4.3 MB Basics of Motor Control Centers


  28. mpriya
    Feb 28, 2013

    Hi Can you please forward me the 4.3 MB Basics of Motor Control Centers ,because I am been blocked from our administrator.

    Thank you

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