Re: [CAD_CAM_EDM_DRO] Inverters/phase converters

With the 3hp running you will not have any voltage problems with the VFD.
Darrell

----- Original Message -----
From: Doug Harrison <prototype@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Wednesday, July 05, 2000 6:42 PM
Subject: Re: [CAD_CAM_EDM_DRO] Inverters/phase converters


> Voltages are as follows (L3 is the generated leg):
>
> Phase converter - no load
> L1-L2 244V
> L1-L3 270V
> L2-L3 252V
>
> Phase converter - 3hp motor running
> L1-L2 243V
> L1-L3 232V
> L2-L3 235V
>
> I suspect the voltage at L1-L3 and L2-L3 would drop more if the motor were
> under load. The converter is much quieter when a motor is connected,
> indicating better phase balance.
>
> My experimenting will involve programming the VFD and trajectory card -
the
> motor will not be under load at this stage. I just want to make sure I
know
> what buttons to push before I turn off and remove parts from my client's
> main source of income.
>
> We are going with Baldor stuff this time around because the vendor
promised
> to assist with programming. Next time I hope to use Hitachi and save
about
> $1200.
>
> Doug
>
> >
> First question is how high is high? and what does it settle down to?
Actual
> voltages are important. I have run a VFD on a rotary and had no problems.
> If the rotary generated leg comes within 20 - 30 volts of the mains when
the
> other motor is running, you should not have any problems and to be safe I
> would have the other motor running. The voltage measurement that I am
> talking about is measuring from leg to leg (L1 to L2, L2 to L3, L3 to L1)
> measuring from L1 and L2 to ground (assuming L1 and L2 are the mains)
should
> give a reading of 120 volts AC. Measuring L3 to ground on the other hand
> could read 200 or higher. What is important is the leg to leg voltage.
> Darrell
> >
>
>
>
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