Posted by buickanddeere on March 03, 2011 at 06:07:24 from (216.183.130.158):
In Reply to: Re: ot electric motor posted by Janicholson on March 02, 2011 at 19:10:48:
Something odd going on. A 10HP single phase low efficiency motor without run capacitors draws 50amp on 240V. A new high efficiency/high power factor 10HP maybe as low as 40amp. At 40 amp the motor requires #6 or heavier cable. 46amp thermal overload protection set point assuming the motor has a 115% service factor. Note some thermals get set for 40 to provide 46amp protection. Others thermals are set to 46amp to provide protection at 46 amps. Short circuit protection in the main disconnect needs to be either 125 amp fast blow fuses, 70amp time delay or a 100amp breaker. Overloaded or not, the thermal protection in the motor starter should provide burnout protection. Any chance hot discharge air from the pump is blowing into the motor cooling inlet? During milking times morning and night. It's peak demand on the utility grid and on your farm service. Voltage maybe fine mid day while trouble shooting but while milking. That motor maybe only seeing 200V. Demand from the pump while the milkers are running will differ from just running dead headed during a mid day test. Any vibration issues? Jan you sound more experienced and knowledgeable with electricity that 90% of folk here. I have seen an oops once however when a 240V motor was wired with one 120V and back to chassis ground.
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