As much as I know, all VFD are 3 phases connected (without central
connection available) (some are only 2 phases, but there is still a full
bridge rectifier)
The scheme you wanted to use will make a doubling of the voltage, most
probably killing the VFD (about 640Vdc on the bus if main line is
On Wed, Nov 21, 2012 at 2:37 AM, Claude Froidevaux wrote:
> If you put neutral on terminal L1 and phase on terminal 2 and 3, it
> will simply parallel 2 leg of the rectifier, this will change nothing.
>
Well, my original idea assumed that the 3phase input would have the Y / wye
configuration, so
:kwall...@wallacecompany.com]
> Sent: Tuesday, November 20, 2012 11:00 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] VFD input
>
> On Tue, 2012-11-20 at 17:28 -0500, Przemek Klosowski wrote:
> ... snip
> > I can see that, while equalizing the load
If you put neutral on terminal L1 and phase on terminal 2 and 3, it
will simply parallel 2 leg of the rectifier, this will change nothing.
If you don't have enough power, you can try to increase capacitor bank
by adding external capacitor (most VFD provide connection to DC bus).
Take care that
How many kW are you looking for?
Greg
- Original Message -
From: "Przemek Klosowski"
To: "Enhanced Machine Controller (EMC)"
Sent: Wednesday, November 21, 2012 12:28 AM
Subject: [Emc-users] VFD input
> Not strictly EMC but I am sure people here will know th
On Tue, 2012-11-20 at 17:28 -0500, Przemek Klosowski wrote:
... snip
> I can see that, while equalizing the load across the rectifiers, this
> scheme doesn't help with power variation within the 50/60Hz cycle, so some
> derating is still called for, I think.
... snip
I've given this some thought t
On Tue, 20 Nov 2012, Przemek Klosowski wrote:
> Date: Tue, 20 Nov 2012 17:28:14 -0500
> From: Przemek Klosowski
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] VFD input
>
> Not
On 20 November 2012 22:28, Przemek Klosowski
wrote:
> It occurred to me that since the input circuit should be just a 3-phase
> rectifier, it should work to connect all three input terminals together,
> and feed that from the single phase.
Two wires, three terminals. What is your proposal?
--
Not strictly EMC but I am sure people here will know the answer. We all
know that a 3-phase VFD can often be used off one-phase. Since all the
current is then pulled off the one leg of the input rectifier, the standard
wisdom says that you derate the VFD power in this situation by a factor of
2 or
