Dolphin Ampmasters

[DJ88]

The current measurements I took were True RMS. As an FYI. I won't go into the pump theories.

How I was told that the wattage consumption and current numbers were obtained was by measuring one of the poles in the motor itself(the number one pole)to me this means only part of the motors draw is being tested. If I am wrong here someone correct me.

As an FYI. ok I don't have the first clue about how these motors/pumps operate when it comes to cavitation. but I just turned my Ampmaster on and measured the current draw as I varied the head pressure by opening and closing the ball valve immediately after the pump. As I increased head pressure(closed the valve and increased resistence to flow) the current dropped. I don't know what happens inside all I know is the numbers I have in front of me. The more head pressure the lower the draw. I don't explain em. I measure em. :confused:

I still don't know where the differnece in numbers is arising from but I have a feeling it is partially due to line losses(very minimally IMO) and due to the actual operation of the motor off of the test bench. When hooked up in a real world situation it is pulling 2-2.5Amps. and 222Watts after a short "warm up" period.

If I could take it apart and bench test it I would. But I paid $500 for this puppy and if I take it apart I void my 9 year warranty.

As I test more pumps I'll post the data. Jim, Steve. Keep talking. As you talk the more I learn.

Victor,

I agree there will be a break in period as tehre is with anythign mechanical, but enough to pull twice the rated current??? :confused:

I still think due to the set up of the motor measuring the power and current of one pole on an electric motor is not giving us all the numbers. As the motor spins will ther enot be a period where current is applied to more than one pole? not full "power" but a partial draw? if this is the case then won't the draw be more than the 150W and 1.3Amps that ONE pole draws?? I am trying to go back and remember my AC motor theory. and not having much luck at it.