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.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
... [Read Article]
Latest Ad:
1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
