Posted by Janicholson on March 02, 2011 at 19:10:48 from (64.61.211.198):
In Reply to: Re: ot electric motor posted by dieseldoc on March 02, 2011 at 18:25:48:
As you indicate there is reliable clean supply of power, my answer is that what you are running with the motor is taking excessive power. My first move would be to assess the loads being placed on the equipment. Both operating loads, and idle running loads. If there is a bearing or shaft going bad or rubbing on other parts, the burn out might be expected. If the equipment checks out perfectly, and employees (or self) are not overloading it, I would put a 15 HP motor on the equipment. My off hand calculation is that 33 amps is too much for continuous load. My thinking is around 25 or less amps. 40 should be starting amps, and circuit breaker fuse rating. Put a shaft tach on it to see if it is close to RPM. if it is within 95% it should be OK. if more like 80 it will burn up readily. Jim
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