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Old October 26th 05, 06:44 PM
Jay Pique
 
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Default VFD versus Phase Converter versus 3-phase power

Assume that I have in front of the above referenced options. I can
pick only one - a VFD, a (rotary) Phase Converter or straight 3-phase
power for the 3-phase 16" Rockwell RAS I picked up for $300. In the
long run, which will cost less to own and operate over time? Assume
the 5hp VFD is $250 and the 5hp converter is $400. Am I likely to
spend a lot more money on power if I have to spring for 3-phase direct?
Manintenance issues with the VFD and converter relative to 3-phase
power - and to each other?

Thanks, and I'm googling too.

JP
************
Phased.


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Old October 26th 05, 07:10 PM
Jim
 
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Default VFD versus Phase Converter versus 3-phase power


"Jay Pique" wrote in message
ups.com...
Assume that I have in front of the above referenced options. I can
pick only one - a VFD, a (rotary) Phase Converter or straight 3-phase
power for the 3-phase 16" Rockwell RAS I picked up for $300. In the
long run, which will cost less to own and operate over time? Assume
the 5hp VFD is $250 and the 5hp converter is $400. Am I likely to
spend a lot more money on power if I have to spring for 3-phase direct?
Manintenance issues with the VFD and converter relative to 3-phase
power - and to each other?

Thanks, and I'm googling too.

JP
************
Phased.

Can you get 3 phase power in your shop? Three phase will be cheaper to run
because all those converters are not 100 % efficient.
Jim


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Old October 26th 05, 10:19 PM
Morris Dovey
 
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Default VFD versus Phase Converter versus 3-phase power

Jay Pique (in )
said:

| Assume that I have in front of the above referenced options. I can
| pick only one - a VFD, a (rotary) Phase Converter or straight
| 3-phase power for the 3-phase 16" Rockwell RAS I picked up for
| $300. In the long run, which will cost less to own and operate
| over time? Assume the 5hp VFD is $250 and the 5hp converter is
| $400. Am I likely to spend a lot more money on power if I have to
| spring for 3-phase direct? Manintenance issues with the VFD and
| converter relative to 3-phase power - and to each other?

Jay...

You might want to check out the Delta (not the same Delta that makes
power tools) VFD-B. I paid a bit more than $250 for it; but (IMO) it's
great. Mine is used to control a Colombo 5HP 0-24K RPM (in 1/10 RPM
steps!) spindle on my ShopBot and it's been absolutely trouble-free
since I got it 2+ years ago. It's fully programmable from its own
keypad - so if you wanted to, for example, have automatic braking when
you're done with a cut, you could.

The downside is that you'd want to re-wire your RAS switch so that it
provides a control signal to the VFD.

The Delta guys in Atlanta have been extremely helpful by digging out
the info and coaching me on how to control the VFD-B using an RS-485
serial port on my PC. Not sure that'd be terribly useful on a RAS, but
is great on the CNC router.

I like it! :-)

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/solar.html




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Old October 27th 05, 12:18 AM
Bert
 
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Default VFD versus Phase Converter versus 3-phase power

Jay Pique wrote:
Assume that I have in front of the above referenced options. I can
pick only one - a VFD, a (rotary) Phase Converter or straight 3-phase
power for the 3-phase 16" Rockwell RAS I picked up for $300. In the
long run, which will cost less to own and operate over time? Assume
the 5hp VFD is $250 and the 5hp converter is $400. Am I likely to
spend a lot more money on power if I have to spring for 3-phase direct?
Manintenance issues with the VFD and converter relative to 3-phase
power - and to each other?

Thanks, and I'm googling too.

JP
************
Phased.



I prefer a RPC over the VFD, but is mainly a personal preference unless
you need the variable speed the VFD allows.

VFD's take longer to get the motor up to speed, I have noticed. I have
also killed a static PC and a VFD on my Bridgeport mill but the RPC is
still going strong after 5 years of use.

I made my 5Hp RPC for less than $30 with salvaged components, it is
very easy to do.

Straight 3-phase is best, unless you need variable speed, but for only
1 tool will cost alot to install.

MikeB

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Old October 27th 05, 12:20 AM
[email protected]
 
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Default VFD versus Phase Converter versus 3-phase power

On 26 Oct 2005 09:44:33 -0700, "Jay Pique"
wrote:

Assume that I have in front of the above referenced options. I can
pick only one - a VFD, a (rotary) Phase Converter or straight 3-phase
power for the 3-phase 16" Rockwell RAS I picked up for $300. In the
long run, which will cost less to own and operate over time? Assume
the 5hp VFD is $250 and the 5hp converter is $400. Am I likely to
spend a lot more money on power if I have to spring for 3-phase direct?


ask your electric company. policies are very local- some places
they'll refuse to hook it up to a residential building, other places
there is a hookup fee, other places they will set you up for free.

how it will compare per unit cost I have no idea.



Manintenance issues with the VFD and converter relative to 3-phase
power - and to each other?

Thanks, and I'm googling too.

JP
************
Phased.

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Old October 27th 05, 02:15 AM
[email protected]
 
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Default VFD versus Phase Converter versus 3-phase power

If three phase power at the right voltage is available it will require
a seperate wire run to the shop and meter. There is a monthly charge
just like your electric bill. If you do not have a high demand it is
not horribly expensive but I would not pay it for a hobby.

Is it an option to change the motor to a 220 volt single phase. ?

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