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  1. Square D is no panacea these days. I have a...

    Square D is no panacea these days. I have a recall notice on my desk for some. Seems as though some of them don't shut off with the handle. 30 and 60A 240V models.

    Bulldog from the 50's, has the...
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    Air System Mulitport Auto Drain

    Thought I'd share this method of a reliable compressed air system drain. This may be a bit over the top for a small system, but is perfect for a large system, or a system with lots of scale,...
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    Versitale HVLP Paint Gun

    My favorite HVLP gun for painting parts and equipment is a small Anest Iwata W-101, recommend to me by a painting equipment supplier that I wire industrial paint systems for. I use it mostly for...
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    Some parts and possibly documentation available...

    Some parts and possibly documentation available from here.

    Kellogg-American Rebuild/Tune Up Kits - Air Compressor Equipment

    Manuals | Kellogg American

    SAF Ω
  5. You need to connect one side of the 480V coil to...

    You need to connect one side of the 480V coil to ground, H1 or H2. As JST has noted.

    Any fault current on the 480V side, needs a way to get back to that 480V output coil.

    You should consider...
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    For your further information, on the next go...

    For your further information, on the next go round.

    A capacity chart for 3M wire nuts, they are UL listed for up two #6 AWG in the large blue size, so two #10's and a #8 is no problem.

    3M...
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    GE Drive Isolation Multitap Xformer

    Your Model was a special made around 2005. It does have two Wye output windings as indicated on the tag.
    X's are 460/266V @ 20KVA capacity, Y's are 230/133V @ 7.5KVA

    267528

    A similar but not...
  8. A competent motor winder could have a look at the...

    A competent motor winder could have a look at the connections on the stator winding under the endbell, and tell you how many poles and what voltage the connections are spliced for.

    They can be cut...
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    You might consider a Industrial Curtain with a...

    You might consider a Industrial Curtain with a weighted bottom, trolley rail on top, and a small crane slot for the crane cables near the center.

    The whole curtain wall could be opened as...
  10. Use a Blair Bit With a custom made pilot to fit...

    Use a Blair Bit With a custom made pilot to fit your existing hole, or a external hole guide clamped to your work.

    They make razor clean holes with minimal effort and last for years when used and...
  11. If you removed the Buck transformers you would...

    If you removed the Buck transformers you would get 16 more volts to the CNC, than you have now.
    You stated that you get 8 volts of drop when your compressors starts. With 16 more volts from the Buck...
  12. Staying above the lower voltage limit, during the voltage drop.

    My solution, given the service you have would be three things.

    Reduce the startup load. Change the motor pulley, to reduce pump speed and load.

    The motor is drawing over nameplate FLA, at the...
  13. Can you post a photo of the transformer tag?...

    Can you post a photo of the transformer tag? Normally adjustment taps are on the input side.

    Is yours a reverse connected unit?
    If so the taps will operate in reverse.

    What is your input...
  14. 2 Line leads would be switched, to change...

    2 Line leads would be switched, to change rotation.

    SAF Ω
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    Instead of a control transformer, fusing, an...

    Instead of a control transformer, fusing, an outlet and a wall wart switch mode power supply, you might consider a switch mode power supply, 240VAC to 5VDC, intended for a control panel. Likely to...
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    Check your wall wart, many can accept up to 240V....

    Check your wall wart, many can accept up to 240V.

    What is it's output rated at, a new wall wart of the proper rating might be easier and cheaper?

    SAF Ω
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    The control transformer is wired for 480V input,...

    The control transformer is wired for 480V input, and 120V output for the controls.

    The motor is likely wired for 380V input, but powered at 480V 3Φ 60Hz.

    Motor will run fine at 480V 60Hz, but...
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    It can be done with two single phase units,...

    It can be done with two single phase units, 480/240 x 240/120, in a open delta configuration. The 480V output windings, output ungrounded open delta, as shown in the drawing. To ground the output...
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    Compressor circuit sizing.

    Beesr,

    Selecting a circuit makeup, and protecting a motor are separate functions, normally.
    The NEC requires that you use a code table for the motor HP size, to determine the the motor amps to...
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    Adjustable overload relays are convenient, but...

    Adjustable overload relays are convenient, but usually contain differential protection, or as some call it phase loss protection. That's not usually the best choice for use with a RPC . If the...
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    If the point is to learn, then I would put it...

    If the point is to learn, then I would put it back to how it was and run it at 480V.

    Learn how it was designed to operate, with it's PLC control and tapping function, Do you need or desire the...
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    Motor Starter Upgrade

    Myself, I would inspect the condition of the size 0 contacts first and clean them, if they were decent, I'd run them. NEMA starters are pretty tough.

    To be a purist there are many parts abounding...
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    That's what I would do. And likely why the...

    That's what I would do. And likely why the starter used, has a dual voltage coil, so it could be converted.

    SAF Ω
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    From the form of your sketch, i would guess that...

    From the form of your sketch, i would guess that you have a Furnace brand starter, with the dual voltage coil.

    If your compressor was previously wired for 480V, you likely need to change out the...
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    Air Compressor Control Wiring

    Hopefully this will help it make more sense.

    Make sure your overload relay is reset.
    Leave one probe on L1 and test all terminals on the L2 side.
    Leave one probe on L2 and test all terminals on...
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