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AVR when changing a generator from 480 to 240V

AVR when changing a generator from 480 to 240V

AVR when changing a generator from 480 to 240V

We're changing a Stadco Generator from 480 to 240.

I'm trying to understand how the AVR (SX460) recognizes the change so it doesn't try to drive the field up to get 480V.

Maybe it's handled in the generator during the re-connection? I don't understand what terminals 7 and 8 are so I'm wondering 'how do it know'?

Keith Cress
kcress - http://www.flaminsystems.com

RE: AVR when changing a generator from 480 to 240V

Hi Keith. If the generator follows standard numbering, there will be 240 Volts between terminals 7 and 8.
When you reconnect for 240 Volts, Terminal 1 will be connected to terminal 7 and terminal 2 will be connected to terminal 8.
Still 240 Volts.
It should work fine still connected to terminals 7 and 8.
Look at a connection diagram for a 230:460 Volt motor. Yes it's 9 leads instead of 12 leads but 7 and 8 will be the same.
You can see that on the 460 Volt connection the voltage across 7 and 8 is 1/2 of the applied voltage.
(On a generator, the wye point is broken into leads 10, 11 and 12. The other 9 leads are numbered the same as a 9 lead motor.)

"Why not the best?"
Jimmy Carter

RE: AVR when changing a generator from 480 to 240V

Or put slightly differently - in the high voltage series-connected configuration the AVR senses voltage at the mid-point of the winding and not on the line end. In the low voltage parallel connection the AVR senses the output voltage directly.

RE: AVR when changing a generator from 480 to 240V

AHhhh! That makes sense. Pretty dang clever really. The AVR always controls to 240V.


Keith Cress
kcress - http://www.flaminsystems.com

RE: AVR when changing a generator from 480 to 240V

Exactly Scotty. I wish that I'd said that

"Why not the best?"
Jimmy Carter

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