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  1. Replies
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    In the video you posted, of the saw. The motor...

    In the video you posted, of the saw. The motor control switch shown, is a "manual motor controller", rated for switching the motor current directly. The way you can tell is it has two cables wired...
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    Normally a proprietary unit. 275553

    Normally a proprietary unit.
    275553
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    My take is, you have one of the earlier European,...

    My take is, you have one of the earlier European, "world model" units that were built for high or low voltage, from the factory. Yours happens to be the 400V Y model. It has a variable frequency...
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    Now that we know that your using a phase...

    Now that we know that your using a phase converter with a 240V delta output, what is the HP rating of the motor on your phase converter and the HP rating of the compressor motor?

    Are you aware...
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    Before looking for anything, it would be best if...

    Before looking for anything, it would be best if you measured your building voltage, phase to phase voltage, and phase to ground. Then provide the nameplate from the compressor you wish to run....
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    They can be connected either way, buck or boost....

    They can be connected either way, buck or boost. You had the info, that it was needing to be bucked down closer to the machine nameplate. But it appears that you like to tease that information out of...
  7. Seems like uncle didn't tell them to ship the RPC...

    Seems like uncle didn't tell them to ship the RPC with the machine.
    How about the mill, it needs the same thing?

    Or it may have one built into the controls, but not likely.
    Motor tag calls out a...
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    From your diagram, looks like they were setup for...

    From your diagram, looks like they were setup for the boosting configuration.
    460 to 483V. Conventional connection diagram.
    274902

    The transformer you need is a 240Delta Input with a 480 Wye...
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    Those transformers are a Buck-Boost pair. They...

    Those transformers are a Buck-Boost pair. They can add or subtract 24 or 48 Volts to your line voltage.
    They cannot be used to go from 240V to 480V. You will need a 3Φ transformer or a rewiring of...
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    Balancing A Buck Boost

    Here's my suggestion to your dilemma.

    I'm with JST and SND, you added more impedance, and you unbalanced the input to the Phase Perfect, as compared to your 120/240V service.

    A standard buck...
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    How about a motor tag? it would be helpful to...

    How about a motor tag? it would be helpful to know what the motor was designed to operate with.

    The chairs that I have worked on that were 120VAC, required a start relay, a current type, or a...
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    Make sure that you have the motor leads connected...

    Make sure that you have the motor leads connected properly, and ensure that you do not have T6 and T9 transposed.

    273365

    For measuring motor speed a optical tachometer can be used.
    Digital...
  13. Sounds like you understand correctly now. Just...

    Sounds like you understand correctly now. Just follow the drawing exactly. If the wire tags are damaged, don't guess, label them.

    L1 feeds U1, W2, -- L2 feeds V1, U2, -- L3 feeds W1, V2
    If...
  14. For the normal Y/▲ starter, with 3 contactor's,...

    For the normal Y/▲ starter, with 3 contactor's, and the same 12 lead motor, this is the diagram I posted earlier, in post #2.

    Notice it has the same phase rotation reversal from one winding half,...
  15. Again you don't have enough contactors for Y/▲,...

    Again you don't have enough contactors for Y/▲, Your setup is across the line starting only.

    For 480V the 2nd half of the motor winding's run back to the terminal strip, and had shorting bars...
  16. Kaeser SK26

    Best thing you could do, is download a copy of the manual, it just requires a quick search.

    After reviewing the official German print, slightly different from your rag, shows that is was...
  17. 1Φ Wye Service to 3Φ Wye Service, Open Wye- Open Delta Bank

    Nice job Bill, you got their attention better than I did. How about some phasing dots for our Euro friends, that never heard of using a Yankee open delta connection, center tapped delta, open Wye or...
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    My guess is that your other machines have...

    My guess is that your other machines have manually operated electrical switches, or drum switches, that connect the load motor directly to the VFD output.

    The drill has a reversing contactor that...
  19. Open Wye - Open Delta Transformer Connections

    There exists a transformer method that can utilize two legs and a neutral of a wye system, and convert that into a open delta 3Φ output.

    It's called an open wye - open delta. It's not very common,...
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    That's the one, say's right on the tag, "step up...

    That's the one, say's right on the tag, "step up operation only"

    How many greenback's did you give up?

    SAF Ω
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    Buck Boost Sizing

    How about Green Horn Electrical Engineer?

    Your math is off, and that unit is woefully undersized, for using on the input to the phase perfect. It's capacity is only rated for 5A @240V , likely why...
  22. You could post a photo of your motor data plate...

    You could post a photo of your motor data plate and a shot of the connection block, so we could see what your working with. Is this statement really true?



    Can you tell us what your supply...
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    Nothing easy about re-leading for dual voltage,...

    Nothing easy about re-leading for dual voltage, almost as much work as a rewind, cost's likely near the same.

    If it's in good condition, you must cut the stator lacing apart to un-bury the...
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    Sg3a0015dk

    That number, SG3A0015DK appears to be the proper unit, I would want to see the tag to be sure, Proper step up, (not step down, used in reverse) 15KVA 240V delta input and 480 wye output. Aluminum is...
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    Disconnect the wiring at the input to the phase...

    Disconnect the wiring at the input to the phase perfect and then see if the transformer input breaker holds, recheck the transformer bank output voltage, if it holds on.

    SAF Ω
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