Re: [CAD_CAM_EDM_DRO] 3 Phase rotary converters

Assuming a 230 V system something less than that. I think one of the
standard ones is around 187 vac. BTW on a 10hp system I recommend you use
the potential relay to operate a contactor rated for your motor hp. I used
a 2 pole and ran it thru BOTH poles. If the relay/contater sticks it blows
up the starting caps in less than 5 sec. (ask me how I know).
Good luck, Beau

----- Original Message -----
From: "David Speck" <Dave@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 08, 2005 11:14 AM
Subject: [CAD_CAM_EDM_DRO] 3 Phase rotary converters


> Anyone have experience designing 3 phase rotary converters?
>
> I'm building a 10 HP unit now, and have seen designs for self starting
> systems that use a voltage sensitive (potential) relay connected between
> the midpoint of the powered winding and the derived phase to disconnect
> the start capacitors when the converter motor reaches full speed.
>
> Can anyone suggest at what voltage the start relay should drop out?
> I've seen specific part number suggested, but no actual voltage ratings.
>
> Thanks in advance.
> Dave
>
>
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