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  1. Thread: transformer

    by Besoeker
    Replies
    11$$
    Views
    431

    So two different transformers?

    So two different transformers?
  2. Thread: transformer

    by Besoeker
    Replies
    11$$
    Views
    431

    Yes, they could but we don't have appear to have...

    Yes, they could but we don't have appear to have a definitive value for that. Is it 200A or 400A?
  3. Thread: transformer

    by Besoeker
    Replies
    11$$
    Views
    431

    You need to provide actual kVA rating to work out...

    You need to provide actual kVA rating to work out the currents.
  4. I'd want them to be literate, numerate, and...

    I'd want them to be literate, numerate, and respectful.
  5. I agree.

    I agree.
  6. Thread: motor ?

    by Besoeker
    Replies
    5$$
    Views
    328

    Don't know if this will work..... Calculated...

    Don't know if this will work.....


    Calculated Performance LRT PUT "2/4" "3/4" FLC
    External Rotor Res (W) 0.000 0.000 0.000 0.000 0.000
    Slip (pu) 1.000 0.064 0.002 0.003 0.005...
  7. Replies
    54$$
    Views
    1,786

    From their website: Phrases like "can be...

    From their website:



    Phrases like "can be used in combination with" and "helps prevent" don't fill me with a great deal of confidence.
  8. Replies
    54$$
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    1,786

    Open circuit or short circuit in that particular...

    Open circuit or short circuit in that particular case?
  9. Replies
    54$$
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    1,786

    This is true. Failure mode though? Fail to close...

    This is true. Failure mode though?
    Fail to close if the control wires fall off? Not likely to be an unsafe condition.
    Fail to open if the contacts weld? Possible, and can pose a risk. We sequence...
  10. Replies
    54$$
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    1,786

    Then I'm tempted to come with that hackneyed old...

    Then I'm tempted to come with that hackneyed old phrase "well they would say that, wouldn't they?"
    An independent study just might carry a bit more authority.

    I'm not saying that the...
  11. Replies
    54$$
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    1,786

    That "somehow" would be interesting to know.

    That "somehow" would be interesting to know.
  12. Replies
    54$$
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    1,786

    Can you provide the numbers?

    Can you provide the numbers?
  13. Replies
    54$$
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    1,786

    There's less to go wrong with a contactor.

    There's less to go wrong with a contactor.
  14. Replies
    54$$
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    1,786

    Indeed you could. But we always fit a contactor -...

    Indeed you could. But we always fit a contactor - that is invariably part of the requirements to get a physical disconnect in the event of an EM stop.
  15. Replies
    54$$
    Views
    1,786

    But you can put a padlock on the supply to it.

    But you can put a padlock on the supply to it.
  16. Replies
    54$$
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    1,786

    Neither would I. Nor the driven plant.

    Neither would I. Nor the driven plant.
  17. Replies
    54$$
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    1,786

    Pretty much any application. Pumps, fans, paper...

    Pretty much any application. Pumps, fans, paper machines, conveyors........
  18. Replies
    9$$
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    462

    Your topic title is: Then you on to talk...

    Your topic title is:


    Then you on to talk about current ratings. Don't confuse Amps and Volts.
    Anyway, I'm with Dennis. If you are switching a 20A device you need a 20A switch.
    If the devices...
  19. Thread: Heat @ 0 hz.

    by Besoeker
    Replies
    34$$
    Views
    1,192

    0Hz is not the same as zero speed. You need slip...

    0Hz is not the same as zero speed.
    You need slip to get torque.
  20. Replies
    9$$
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    305

    Good point.

    Good point.
  21. Replies
    54$$
    Views
    1,786

    Glenn could have been invited too! But back to...

    Glenn could have been invited too!

    But back to VFDs and starters.
    We wouldn't get by without at least a contactor to provide a hard wired disconnect between drive and motor. In many cases we also...
  22. Replies
    54$$
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    1,786

    Yes. The "kiss" principle. There are different...

    Yes. The "kiss" principle.
    There are different levels of specifications. That which tell the manufacturer how to do the job they have been contracted to do - compiled by consultants who have never...
  23. Replies
    9$$
    Views
    305

    If it's three phase wye (star) as your...

    If it's three phase wye (star) as your description indicates, it would have a star point, not a centre tap. The star point is simply the common point where the three secondary windings are connected...
  24. Replies
    54$$
    Views
    1,786

    I also think they can be lazy or take the line of...

    I also think they can be lazy or take the line of least resistance by using sections from past projects regardless of relevance to the job in hand.
  25. Replies
    54$$
    Views
    1,786

    Consultants specs.........tell me about...

    Consultants specs.........tell me about them.............we once bid a project for a number of fairly large variable speed drives for a project in the middle east.
    The performance spec for the...
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