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  1. You might want to look at pricing out some #4 AWG...

    You might want to look at pricing out some #4 AWG aluminum SE cable for a rating of 55A @ 60°C.

    Alu #4 w/4 conductors $1.21 ft. ...
  2. Your not reading that chart correctly. For...

    Your not reading that chart correctly. For circuits 100A and smaller, you are required to use the 60°C column, unless the terminals at each end are approved for 75°C.

    For circuits over 100A, the...
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    240 to 480 Auto-transformer

    Use a 2KVA 240 x 480-120/240 single phase transformer, connected as a auto-transformer.

    Buck boost is not the right term, this implys a small voltage change, you want to double.

    289282

    Is...
  4. Sounds like your running the 480V machines...

    Sounds like your running the 480V machines ungrounded, it must be since they are still working fine.
    You may have a ground wire connected to them from your RPC supply, but that will not get fault...
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    Sending a 30HP out today for this very treatment,...

    Sending a 30HP out today for this very treatment, along with some new bearings. It runs nice, and megs OK as it is, but is dripping in oil. Needs a refresh before re-purposing it.

    SAF Ω
  6. From a NEC perspective. It appears from your...

    From a NEC perspective.

    It appears from your post that your existing building wiring may be correct. You equipment wiring not so much.

    The grounded conductor (neutral) and the equipment...
  7. Thread: Relay Repair

    by SAF
    Replies
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    1,393

    If it were me, first thing I would check is the...

    If it were me, first thing I would check is the contact block, on the back of the selector selector switch.
    The contact blocks have a spring return, when you actuate the switch. If the plunger on...
  8. Instead of cluttering up Don's thread, please...

    Instead of cluttering up Don's thread, please start your own. Include a complete picture of your transformer label, and state the voltage you are feeding it, and what the voltage requirement are of...
  9. 240V to 600V RPC RPC

    Don, you may want to have a look at this thread. A RPC built to produce 575V with a 1Φ transformer on the front end, instead of a a 3Φ one on the rear end. The required parts may be easier to source...
  10. Have a look at this thread and Peter explains the...

    Have a look at this thread and Peter explains the difference of the neutral from you 1Φ system from your 3Φ output, which has no neutral connection from your idler windings.

    Thread: Three-Phase...
  11. A bit of reverse engineering your motor...

    A bit of reverse engineering your motor connections, using this motor connection diagram from Amazon, which is similar to yours, but slightly different model 6K321BE
    285438

    Reveals a problem with...
  12. Yah, that's all well and good, but if you take a...

    Yah, that's all well and good, but if you take a look at it, it's not what he has. It's a different revision, and the diagram and colors don't match what he posted.

    SAF Ω
  13. As has been mentioned, we can't help any further...

    As has been mentioned, we can't help any further without a better photo of the motor connection diagram and connection plate, it's illegible. Only guesses can be made, and that hasn't got you very...
  14. If your RPC output is 240V, its not a good idea...

    If your RPC output is 240V, its not a good idea to feed a 208V transformer coil, with over voltage +15%.

    If you were backfeeding a WYE winding, with your center tapped DELTA supply (wild leg), you...
  15. For a explanation, I would suggest that you do a...

    For a explanation, I would suggest that you do a little homework for yourself. You make some assumptions, to guide the OP'er, most of which are factually incorrect. It doesn't help him by sending him...
  16. This diagram is similar to what you have. I can't...

    This diagram is similar to what you have. I can't read very well your motor connection diagram, but should be very similar to the one in this diagram. Your drum switch is a different brand, but the...
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    AB 609 Sz 0 Manual Starter, Type W heater Element Table #112

    That does make a difference, another 10%. But I would caution against going bigger, unless absolutely necessary. Your motor is old, and intermittent duty, as far as load is concerned. So I would...
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    AB Heater Element Selection

    That is incorrect, read the note at the bottom of the heater chart. It says that the full load amps listed in the chart already includes the 15% for the service factor amperage. For 8A you would...
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    RPC, Induction Boosted 3rd Leg

    A link to a more readable PDF copy of the Richardson article.

    I have sourced a transformer to try this method, on a 480V prototype RPC I have, but haven't made time to try that feature out yet.
    ...
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    RPC & Auto-transformer Boost.

    It is an RPC, with an addition such as this example. Has boost transformer and balance caps. Richardson model.

    283377

    283378

    SAF Ω
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    How do you view the RPC design that uses a...

    How do you view the RPC design that uses a autotransformer and capacitance to supply the third leg. I would think that combo would give the overall best performance, but haven't tried one yet.

    SAF
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    OMG JST, are you trying to awaken Termite again?...

    OMG JST, are you trying to awaken Termite again? We already suffered two pages already! He already splanied, why this is a stupid idea, and ran off the OP'er. Hardhat and earplugs at the ready...
    ...
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    Autotranformer Phase Converter

    There are commercial makers of these type units. And also other ways of phase conversion.
    But most of the information contained here is older, and much of it is from users on other countries, some...
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    I would agree, all of the power supplies I...

    I would agree, all of the power supplies I tested, were rated for 47-63Hz 400/450V. Intended for the EU market.
    His may be different, or not. Only he can tell.

    SAF Ω
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    If your load only consists of a DC power supply,...

    If your load only consists of a DC power supply, all power is rectified, then the frequency will not matter.

    I tested 5 large 3Φ 400V DC power supplies for a customer last week, connected to a...
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