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Type: Posts; User: JST

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  1. Replies
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    437

    If that is the true number you want, a Starrett...

    If that is the true number you want, a Starrett 98 would do you. 0.005"/12", and considerably smaller width in the 6" size..

    It does have a semi-circle recess in the bottom, but it takes up only...
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    937

    Out of that 2K bucks, save enough for SOME kind...

    Out of that 2K bucks, save enough for SOME kind of generator.

    There will be times when you need to recharge. Assuming you are running lead-acid batteries now, as most do, you will NOT want...
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    Pretty common to do that for small loads on a...

    Pretty common to do that for small loads on a machine.

    ALL power is tapped off 3 phase, so, yes. If you have several such separate loads, it is best to use different wire pairs (phases) for...
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    1,365

    Even of you DID have parts missing? Hmmmmm.........

    Even of you DID have parts missing? Hmmmmm......

    Yes. it has been done to control just two of the three legs. Used to be common. and it is not so horribly unsafe, there are disconnects to fix...
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    964

    OK, I have done a bit of this before. 2...

    OK, I have done a bit of this before.

    2 issues...

    first is direct noise from a machine.

    second is noise reflected from walls

    For the first, you put absorbing material between the machine...
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    937

    He's down the coast, look it up. In the "thin...

    He's down the coast, look it up. In the "thin part" along Canada.

    That's still up at Hudson Bay type latitude, but well below the circle. Like I said, think North Scotland, Orkneys maybe.

    On...
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    937

    The big problem with the numbers you have shown...

    The big problem with the numbers you have shown is the recharge rate. The 1500 W of panels is small.

    The more interesting number is the battery capacity. That sets your run time per day, and...
  8. From what I see, it is first class. More pics...

    From what I see, it is first class.

    More pics please.
  9. Replies
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    1,365

    And, at 2 HP, the NEC wants a "motor controller"...

    And, at 2 HP, the NEC wants a "motor controller" complete with an overload sensor that cuts power if an overload beyond it's cut-off rating occurs.. Normally all that is wired to a contactor. At...
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    937

    If you have 240V single phase, I would use it...

    If you have 240V single phase, I would use it directly if you can.

    Adding VFDs and using 3 phase is a way to avoid inrush, and may be a good idea if you have to. The efficiency will not be too...
  11. Replies
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    594

    Sounds like the relay is in fact not releasing. ...

    Sounds like the relay is in fact not releasing. That may be due to it being stuck, or due to the (probably somewhere in there) voltage relay not releasing the capacitor relay when the RPC has come...
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    594

    Alternately, the start cap may never be...

    Alternately, the start cap may never be disconnected automatically with the current wiring.

    It needs to be.

    The question was not which SHOULD BE the start cap, but which one ACTUALLY IS...
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    594

    Perhaps a shot of whatever passes for a data...

    Perhaps a shot of whatever passes for a data plate on the thing?

    Mine I bought used, but it is a very very simple ARCO rotary, with no contactors, one capacitor that does not need to be...
  14. Replies
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    594

    Drawing is too small to read decently. Can you...

    Drawing is too small to read decently. Can you make it bigger?
  15. Rotary are cheap if done oneself. Maybe not a...

    Rotary are cheap if done oneself. Maybe not a good idea for you?
  16. Replies
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    771

    Maybe. There have been advances in IGBTs...

    Maybe. There have been advances in IGBTs recently, but in general that new is likely to be no worse than the later ones. The reputation comes from very old types, I believe.

    No guarantees, but...
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    771

    What is the main question? The remote display? ...

    What is the main question? The remote display? That sounds like the issue.

    You would need an A/D and a micro (preferably all in one) set up to read out in the desired units, so that the red...
  18. Have used "gyrators" a lot, typically in sound...

    Have used "gyrators" a lot, typically in sound system equalizers. Not applicable in power systems, though.



    For that, just about zero, as you can guess. You can do the same things with less...
  19. Going 3 phase to one, where the idea is to get...

    Going 3 phase to one, where the idea is to get all the power of the 3 phase into the single phase line. RPC won't do that, really, or, more accurately, I have not tried it, and there are...
  20. Yes, we built a demonstrator. It worked fine,...

    Yes, we built a demonstrator. It worked fine, but of course needed the capacitor value changed to cover a range of loads. We figured to do that automatically, and had that plan ready for testing....
  21. Thread: Will a vfd work?

    by JST
    Replies
    2
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    349

    It is a bit difficult to determine what you have....

    It is a bit difficult to determine what you have.

    It looks as if incoming power is 3 phase. And the motor definitely is. The question is whether there is already an inverter (VFD) in there,...
  22. Yep, to automate the single to 3 phase system, ,...

    Yep, to automate the single to 3 phase system, , the shift components have to be adjusted by a control system. For the application we had, there was load diversity, and the load would not have...
  23. Heh..... actually, yes it is. Done it, both...

    Heh..... actually, yes it is. Done it, both directions

    Key issue is (gasp, choke) some theory.....

    Two phase has a 90 degree phase difference. So, if you start with single phase, and can...
  24. I believe it works. But, I do not believe I...

    I believe it works.

    But, I do not believe I would want to go on that ride..... Maybe for de-burring, but getting a feed rate that does not want to throw you across the room, while pushing the...
  25. There are lumpty-bump sizes of plugs/jacks of the...

    There are lumpty-bump sizes of plugs/jacks of the coaxial power type, and as far as I have seen, no particular standards for size vs voltage, etc. At least, few seem to pay attention if there are.
    ...
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