[TheForge] Frequency Converters

[Steve Smith]

Well that explains a lot. Burden's is the place with all the good stuff. 
I thought the other URL was Burden's. Thanks for the correct address.

Why not go with one of the single phase motors? They've got some 5HP motors:
http://www.surpluscenter.com/sort.asp?UID=2004092218080590&catname=electric&keyword=MBAL
some of which are cheaper than your 3HP. Also, note that a VFD will cost 
you more than any one of the motors.

Steve

Chuck Robinson wrote:
> Hey Steve,
>  Wrong company.
> The motor I'm looking at is at
> http://www.surpluscenter.com
> The motor would be used to drive a variable speed 2" x 72" heavy duty belt
> grinder for hogging out hammer billets.
> All ready using a 2 hp dc motor and speed controller, But it stalls under hi
> load conditions.
> Chuck
> 
> ----- Original Message -----
> From: "Steve Smith" <sos at alum.mit.edu>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Tuesday, September 21, 2004 7:35 PM
> Subject: Re: [TheForge] Frequency Converters
> 
> 
> 
>>
>>Chuck Robinson wrote:
>>
>>>Hey Folks,
>>>I don't know my ass from my elbow about frequency converters, but the
> 
> latest
> 
>>>Surplus Center  flyer has  a Leeson 3 phase 3450 rpm motor advertised
> 
> for
> 
>>>$150. Item # 10-2041.
>>>Is this a good candidate for FC controller?
>>>If so what is a good source for the FC and approximate price?
>>>Chuck
>>
>>Chuck, I'm not finding your motor on the Surplus Center's web page (I
>>assume you mean http://www.surplussales.com/ ), so I can't help you
>>there. It looks like their web page isn't fully cooperating with
>>Mozilla. Note that used three phase motors (scrapyard, auctions) often
>>go cheap.
>>
>>I think you're talking about a Variable Frequency Drive (VFD); a box of
>>electronics which produces three phase (variable frequency) out of
>>single phase or three phase. A good source is:
>>http://www.dealerselectric.com/
>>Note that they sell a package deal on a VFD and a motor. To see their
>>VFD's, click on "Browse our Inventory" then "Variable Freq. Drives".
>>They are very helpful on the telephone. I bought an FM100 from them for
>>my mill (which of course I haven't had time to put in yet...). A couple
>>of things to note about VFD's:
>>1. You can't hook the VFD output up to a bunch of wiring with different
>>machines on it. The VFD must drive your machine directly, not even using
>>the switch on the machine (there are ways to work this, just not
>>directly). Otherwise, the VFD can be damaged by a no-load condition.
>>2. You can get units up to 3HP that will take single phase input and put
>>out three phase output. Above 3HP, you need to derate by one step if you
>>have single phase in. For instance, if you want to run a 5HP, 3 phase
>>motor off single phase, you need to use a 7.5HP VFD.
>>
>>If you don't already have a three phase motor, it may make more sense to
>>buy a single phase motor. This is probably cheaper than buying both a
>>three phase motor and a VFD.
>>
>>Steve Smith
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