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SW Ohio | I am not up on my single phase amperages but Ifeel certain that 2 ten hp motors will not run on 78 amps if it takes 30 amps to run one five hp.
On the clamp amp meter, clamp only one wire at a time. On single phase the same amperage is in either wire. You can check if you suspect a problem.
On three phase you can check each wire to see if the motor is balanced electrically. This is often checked if you use a rotophase to determine if more or less capacitors are needed. The reading on only one wire is the amperage that motor is using, weather one or three phase.
I think you are close too a reasonable limit wire-wise. It would be good to check your amperages again. And definitly check the transformer. Some motors may pull 300 percent of the rated amperage during a hard (loaded) start. ( Although I don't think single phase ones do) Also there are two amperage ratings. FLA means "Full Load (running) Amperage.
I know it wasn't your question and now is a bad time (harvest coming) but there are advantages to using a rotophase set-up. I use two. They work together into the same power system. Low load = small converter. Higher load = big converter. Highest load = both.
Hope this helps,
Good Luck,
Dave
Edited by L8Bloomer 9/18/2008 23:26
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How many amps can I use????
