Right before the compressor shut off at maximum pressure, it was pulling 40 amps and the supply voltage was about 235 V. The motor was supposed to pull 41 amps at full load, with a 230 V supply. He originally purchased a used 10 hp(1.15 SF) Baldor single phase motor, installed the pulley, and checked it with a clamp on current meter to be sure it was not exceeding the motor's nameplate current. His shop does not have three phase, he runs everything on a 30 hp Rotary phase converter, which is usually loaded fairly close to capacity. About four years ago, my friend purchased an Ingersoll-Rand 10 hp compressor with a three phase motor on it. This is not for a home shop application, this is for a friend with a production shop who runs the air compressor quite a few hours a day, and whose business ceases to function when the compressor fails. That has been tried, it is becoming expensive. OK, I have already seen it posted either here or on the Home Shop Machinist board that the best fix for compressors 10 hp and under is to run a single phase motor.
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