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22KW Star/Delta Motor & Controls

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  • 25-07-2013 12:10pm
    #1
    Randyleprechaun
    Registered Users Posts: 876 ✭✭✭


    Hi,

    Was working on an existing setup the other day.

    22KW motor.

    Basically, my question(s) are;

    1. On which part of the circuit should the overload be positioned.
    2. In relation to the amps that are stated on the motor ID plate, what should the overload be set at?

    I have my own ideas but just want to confirm, or not as the case may be.

    Thanks.

    Ask any questions you require


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    #2
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    didn't you ask about this before?

    there was a huge thread on the matter back when i was mcebee

    all the info you need is there if you search for the thread

    i think the overload can go 3 places and current setting is either FLA or 0.58 FLA


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    #3
    Randyleprechaun
    Registered Users Posts: 876 ✭✭✭Randyleprechaun


    Jeez, maybe I did ask before, had forgotten, apologies. I'll look back for that thread.


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    #4
    maxamillius
    Registered Users Posts: 1,136 ✭✭✭maxamillius


    Mike hammer welcome back didnt realise you were mceebee,good to have a person with your knowledge back!


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    #5
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    The usual position is probably in the main contactor, set at 0.58 of full load. This position gives the best coverage including during startup..

    If in the delta contactor set at 0.58, it will be out of circuit during startup.

    If in the main supply line, set at full load amps, it will be far above the star running current, so not offering much protection then, although likely not needing it for the short star connected duration.


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    #6
    mikeoneill893
    Site Banned Posts: 52 ✭✭mikeoneill893


    Bruthal wrote: »
    The usual position is probably in the main contactor, set at 0.58 of full load. This position gives the best coverage including during startup..

    If in the delta contactor set at 0.58, it will be out of circuit during startup.

    If in the main supply line, set at full load amps, it will be far above the star running current, so not offering much protection then, although likely not needing it for the short star connected duration.

    sounds bout right:pac:

    http://www.boards.ie/vbulletin/showthread.php?p=65224252:pac:

    remember this....deja vu all over again wah:pac:


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    #7
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    mikeoneill893 wrote: »
    sounds bout right:pac:

    http://www.boards.ie/vbulletin/showthread.php?p=65224252:pac:

    remember this....deja vu all over again wah:pac:

    Yea, I forgot about that thread.


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    #8
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    mikeoneill893 wrote: »
    ya i just switched accounts

    i was mcebee
    Yea I realised that alright.
    got the FBI after me
    So have I, I installed an rcbo today.


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    #9
    mikeoneill893
    Site Banned Posts: 52 ✭✭mikeoneill893


    anyone see you buyin it:pac:

    maybe you got tailed by the CER


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