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Re: 180 BPS synch? (fwd)

---------- Forwarded message ----------
Date: Tue, 17 Jul 2007 01:12:26 EDT
From: FIFTYGUY@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: 180 BPS synch? (fwd)

In a message dated 7/16/07 11:33:53 P.M. Eastern Daylight Time,  
tesla@xxxxxxxxxx writes:

>>Does the VFD produce the 3 phase while operating off a single  phase, 220 
>>volts input, or do you have 3 phase at your  home?
>It operates on single phase input and outputs 3 phase. It's an  inverter 
>with bells and whistles.

It's  worth pointing out that a nominally 3-phase drive must be de-rated to a 
much  lesser output when run from a single-phase power source. Some  3-phase 
drives aren't recommended for single-phase supplies, and most  that can have 
to be configured to do so (disabling phase-loss faults).  
Typically, a drive rated at 5 HP with a 3-phase  supply will be rated for 
only 3 HP from a single-phase supply. This makes  sense, if you consider the 
sqrt(3) factor difference in kVA with the same  current and voltage. So be careful 
when shopping/scrounging that drive to run  your RSG...

-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities

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