Quote Originally Posted by arniepj View Post
Ouch,this is starting to hurt thinking about this stuff.
Yeah, tell me about it. OUCH!

What you guys are saying does seem to make a lot of sense.
And I do remember seeing different waveforms from the current sensors on each motor, so perhaps the larger motor, which is driving a Positive Displacement pump at 1000psi, is putting enough force back into the circuit to partially drive the 1/2hp motor (some of the time), effectively reducing the overall current reading by an Amp.

I guess the problem now is ... Is the difference something that's calculatable.

I only installed current sensors on each motor. I didn't put one on the main feed. If I put one there, then it reads the number the customer wants. But I didn't.

Can you just multiply by the "Power Factor" of the motors?
Naahhh, that would be too easy.

Thanks again,