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Visitor Messages

Showing Visitor Messages 1 to 9 of 9
  1. Naman Verma
    03-22-2018 01:13 PM - permalink
    Naman Verma
    Hi Everyone , I have made an automatic star delta starter for 7hp motor when i start the motor in in manual mode the motor works in star connection for 3-4 seconds and when motor comes in delta connection it stops suddenly ...
    I have used schneider contactors of 25 amperes each

    Thanks in Advance
    Have a Nice Day
  2. Blaren
    11-11-2017 01:17 PM - permalink
    Blaren
    Hey,
    I really appreciate your reply on my wye delta vid question!
    I was hoping maybe you could help me out a little more.
    The motor not getting up to speed causing more draw, would that be because of more slip?
    And vfd or no vfd, the 480 is what matters, not the v/hz or anything like that.
    I knew the wye connection would essentially derate the motor power at the same 480 supply versus delta, but couldn't wrap my head around the increased draw, Especially since the purpose of the wye start is to reduce the draw.
    So not having enough power will not allow the motor to get up to speed, which will cause more slip and therefor more current?
    If the motor was well oversized and could get up to speed as connected wye, the current and temp wouldn't have been an issue?
    Thanks again!
  3. LATTC123
    10-26-2017 07:43 PM - permalink
    LATTC123
    So with the nameplate that I sent u, why didn’t they disclose T10,T11, & T12 ... thanks again sir
  4. LATTC123
    10-26-2017 07:42 PM - permalink
    LATTC123
  5. bad_crimp90
    09-19-2016 12:23 PM - permalink
    bad_crimp90
    Thanks for your reply Rob, ill just be testing the waters here in Central California, if all else fails at least i know theres alot of work in Nevada.
  6. bad_crimp90
    09-16-2016 01:12 PM - permalink
    bad_crimp90
    hey Micro, i noticed you were located in Fernley, pretty damn close to where my parents are moving, Fallon....i was curious as to how much work is available for electricians or apprentices in that area? I am in the process of becoming an apprentice here in California with the IBEW, thanks for any input.....Allan
  7. cthom
    08-31-2014 10:18 PM - permalink
    cthom
    Hi there,
    Was reading one of your previous posts about 3phase motors connected for wye-delta starting. I have a 6-lead motor that needs to be connected to a wye-delta contactor setup, but the motor leads are just 2 labeled T1, T2, T3. Does it really matter what the polarity of the windings are, and if so how do I determine this is they weren't labelled from the rewind.

    Thanks in advance,
    Corey
  8. micromind
    10-11-2012 09:19 PM - permalink
    micromind
    If the 480 side of the transformer is a delta connection (almost all of them are), there is no place to land the neutral.

    It cannot go anywhere on the low side; they are different systems.

    A delta connection on the primary side of a transformer, by its nature, is a 3 phase 3 wire connection.

    A wye connection can be 3 phase 3 wire, or it can involve the neutral. This is because a wye has a common point where all 3 coils are connected, a delta does not.

    Once you connect a couple of them, 3 phase transformers are actually easy.

    Best of luck,
    Rob
  9. jcar302
    10-07-2012 08:20 PM - permalink
    jcar302
    Rob, i'd just like to thank you for your posts here: http://www.electriciantalk.com/f2/tr...-feeders-3433/

    In hours of reading today for connecting the identical transformer, so many posts or responders forget where they come from.
    Not everyone connects transformers often and in a competitive market sometimes you just have to learn on the fly. You gotta learn somewhere.
    I do have my old boss (who's like 80 now) to guide me, but it sure as hell helps to at least sound like i know what i'm talking about when he comes by for guidance.
    Your post was not only the most respectful but very informative.
    Enough so that i joined this forum to send you this message.

    I'll end this with one last question, that at this point i do not fully understand, if i'm reading this right, i do NOT need to bring the neutral in from the 480 panel?
    Is that right and why?

    I appreciated your input.
    Thanks,
    Joe

About Me

  • About micromind
    What is your electrical related field/trade:
    Journeyman Elactrician
    General Location
    Fernley, Nevada (near Reno)

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  • Last Activity: Today 12:54 PM
  • Join Date: 08-11-2007
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03-10-2019
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