Re: [CAD_CAM_EDM_DRO] Inverters/phase converters

Doug,

It really depends on how the front end of your drive is designed. Most of
the VFD's I have dealt with have "dumb" front ends that convert the incoming
AC to DC via a 3 phase rectifier. As long as in input current or voltage
never exceeds what this rectifier can handle, everything works fine. This
means you can generally feed them with single phase, as long as things are
derated so you don't exceed input current capability or DC buss ripple
maximum. Bottom line, although I have not done it, I don't see any reason
why there should be any problem running the drive off the converter. One
thing you have to be sure of is that the drive is next to the motor and that
you don't try to do any live switching between the drive and the motor.


cvl

----- Original Message -----
From: "Doug Harrison" <prototype@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Wednesday, July 05, 2000 6:27 PM
Subject: [CAD_CAM_EDM_DRO] Inverters/phase converters


> I am working on a project that requires a vector drive. The motor is
rated at 5hp, as is the drive. This particular drive will not accept single
phase input, so I have to have a three phase source for testing of the
system. My three phase comes from a rotary converter.
>
> Question: Will a good rotary phase converter work as a supply? I have
been told that using any type of phase converter to drive a VFD is not a
good idea. My reason for questioning this advice is that the individual did
not know much about electricity in general.
>
> I know the third leg voltage of my Arco rotary phase converter runs high
when unloaded, but settles right down if it is driving a motor. Would I be
safe if I ran a motor in the background to act as a regulator?
>
> $645 is a good price for a vector drive, but it's not so insignificant
that I can afford to keep extras around for when I make mistakes.
>
> Any advice would be helpful.
>
> Doug Harrison
>
>
> [Non-text portions of this message have been removed]
>
>
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