Reply with QuoteDo a search for the old Fitch Williams RPC design, it should have the tuning features included.
Al.
Need help building a 30hp balanced RPC for a CNC
I picked up a hardinge conquest 42 with a 10hp (7.5kw) spindle. Looks like it requires about 60 amps for 115% full load. The guy I got it from said he ran it off a 50 amp breaker and it ran fine.
Probably picking up a 30hp motor tomorrow. Anything specific I should be looking for when I get the motor? The plate on the motor said it requires 78 amps. Will this also be the case if I'm just using it as an idler?
I guess my first question is how do I calculate a rough estimate for how many and how big capacitors I should get.
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Re: Need help building a 30hp balanced RPC for a CNC
Do a search for the old Fitch Williams RPC design, it should have the tuning features included.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Re: Need help building a 30hp balanced RPC for a CNC
I've been doing some reading. Seems like people are recommending about 15uf per 1 hp on the run side. Does that sound about right?
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Re: Need help building a 30hp balanced RPC for a CNC
Also should I run a separate 220 line for the first 2 phase to the machine from the panel box and use just the rpc for the generated phase?
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Re: Need help building a 30hp balanced RPC for a CNC
The Fitch converter:
404 Not Found
The past two times I edited this post, the URL was magically changed to cnczone. Here it is in words:
www dot cnczone dot com slash FitchWConverter dot pdf
No idea why it gets changed.
-----------------------
Third attempt. Something is autoediting my post and changing the word "practical machinist" (with NO space) into "cnczone". I have attached the pdf.
Re: Need help building a 30hp balanced RPC for a CNC
I found it and read it thanks.
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Re: Need help building a 30hp balanced RPC for a CNC
Is trying to run a 30hp with say a pony start a stretch for 100 amp service? The load Motor is 10hp and takes 22 amps. I also have 2 servos which are 7.6 amps.
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Re: Need help building a 30hp balanced RPC for a CNC
Quote " 15uf per 1 hp on the run side..."
15 didn't work for ME, but 17 did.
