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  #21  
Old 10-15-2020, 05:35 AM
bunkclimber bunkclimber is offline
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Default 10hp rotary phase converter

Quote:
Originally Posted by GWIZ View Post
I would advise no less than 440 volt rated capacitors.
by all means use the highest rating caps you can get..BUT the larger voltage rated caps also use a bigger case size and can sometimes be a challenge to fit into the converter enclosure..the 440v rated caps seem to be a good tradeoff between case size and voltage rating..my shop converter has 440v rated run caps and has been going strong for an easy 25yrs.The starts usually are closer to max with a 330v rating.
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  #22  
Old 10-17-2020, 11:40 AM
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I feel like a dummy.

I had wired my vfd up wrong and that's why it wouldn't run the mill.

I thought the yellow wire was a motor lead. It's a wire that runs from the stop/start buttons on my Kearney & Trecker
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Last edited by GWIZ; 10-17-2020 at 12:08 PM. Reason: rotate picture
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  #23  
Old 10-17-2020, 04:05 PM
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Quote:
Originally Posted by OldRedFord View Post
I feel like a dummy.

I had wired my vfd up wrong and that's why it wouldn't run the mill.

I thought the yellow wire was a motor lead. It's a wire that runs from the stop/start buttons on my Kearney & Trecker
Wow, a Three Star Cutler-Hammer starter, that’s at least 50 years old, likely even more with the wrapped coil.
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  #24  
Old 10-17-2020, 07:05 PM
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Wow, a Three Star Cutler-Hammer starter, that’s at least 50 years old, likely even more with the wrapped coil.
50 years ago C-H used a epoxy cast coil.
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  #25  
Old Yesterday, 07:42 PM
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I've come across some more caps I might be able to have for free if tgey will work.

Will these work for start and balance caps?
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  #26  
Old Yesterday, 08:08 PM
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The blue one states VDC
DC only !
On AC they will likely explode.

not sure what the silver one is maybe.
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  #27  
Old Today, 04:03 AM
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The silver ones are power factor correction caps, it lists the VARS is the tell-tale. Good news is they are rated for use 24 hours a day. As I type this I forgot what the uf said it was, but I think it said 92 and some odd uf. A couple of those is all it will take to boost the voltage on your RPC. With big ones like that, it will make it hard to fine tune it, smaller ones will be helpful to get it just so so. If you have enough, you can bank the leftovers together for the start circuit for a bomb proof cap bank.
Nice find!
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  #28  
Old Today, 04:59 AM
bunkclimber bunkclimber is offline
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Default 10HP phase converter

the black start caps are rated at 370VAC not 330V like I stated in the past. From the previous pics, the blue caps are DC only, useless for a converter.
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