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hi nosmo I think you should try to find a repair shop that reconditions batteries.They might have the fix that you need. There are many Web sites dealing with batteries. GusD

Hello caribou The factors taken in consideration when choosing between a Wye and Delta is the number of available paths for the pole count and the number of turns per coil required for a design. This would determine the number and size of conductors used in the coil. Generally the smaller...

Hello mbailey I have performed the RI test (RIC) using a Motor Circuit Evaluator.This is strictly a static (no load) test and its purpose is to find possible problem with rotor bars. The resultant Graph Pattern should show the condition of your rotor. As for dynamic tests performed to evaluate...

Hllo ahills All of the above posts suggesting different Web sights will help you to jog your memory. EASA as suggested by UKpete,has everything that you need to know for your motor testing/repair/maintain. For starters you need a 1000V/5000V Megger,a Multimeter and an Current...

hello NRaaum I will give it a shot and hopefully somebody can jump in and offer a more theorectical approach to the question. I don't know if you have already used other methods, other than vibration analyses , to detect Rotor Bar Problems.The reason I say this,itis because when one looks at...

Hi tito2004 . My previous experience with Rod Mills/Ball Mills was in a Copper Mine.I am not familiar with the specific concerns regarding equipment operating in the mining of Lead Oxide The equipment would have to be suitable for the location,whether IND Motor,Sync,WRotor or DC. Our plant...

hello draymorris Great endorsement for "Fluke" equipment.It is true ,Fluke makes very reliable equipment,but so do a lot of other manufacturers.HIOKI,HEMI,HP and probably a lot of others. As for the meter test "Drop in the water bucket".I would be very concerned about...

Hello mhuckaby. Without knowing what type of GF relays or CT types being used in your systems,one can only speculate on the possible causes. As you mention ,when relay trip levels are increased the system operates well. As previously noted ,an increase in the Time to trip Delay might be a...

xcmtb Good advice on the safety aspects of saw use as well as making sure that electrical components are right for the job.Electrocutions in the home run very high and the reason is because of the short cuts that we probably all take from time to time.Safety first for all of us. If your motor...

COMAPRO Harmonics are always present whenever an AC current is flowing, even without the help of electronics.Your measured THD of 60% seems extreme under any conditions. Some motors with Low loads or no loads can have asyncronous magnectic fields causing fairly high umbalances at no load. I...

edison123 Thanks for sharing the good news about your motor mod. "All is well that ends well" Regards GusD' GusD

Hi Jsearl Info From a previous post related to your question. The only way to protect your motor is to use a dual function O/L relay, so that you can protect your motor during start (or failed start) and during Delta running. As per the info below ,one has to be careful when setting the O/Ls...

Hi Jomega I fail to see the connection in bettween Contactor performance and motor insulation failure. Of all the probabilities and causes for motor failures this one was not at the top of the list. Perhaps we have something new here. GusD

Hello Electricpete Folowing your last lead regarding the abrupt stop being caused from possible rotor bar problems.The rewind shop should be able to have a very good idea of what the problem was once they take it apart. Are you thinking of overhauling compressor because of the motor problem or...

Hello conveyorman53 From the information of the previous posts it seems that your motor is failing due to siezed bearing/bearings. In some cases motors can burn up and some wire strands gets caught on the rotor cage fins causing locking.If this was the case,the bearings would not necessarily be...

Hello Eaglet I am a little confused when you say that your motors are having a tough time to pass the resistance checks but yet you want to try the Navy's water test. Perhaps I misunderstood your question.In any case I will mention here the MG1-12.63 "conformance test" for moisture...

Hello 280658 When you mention "main engine bearing failure" I believe you are talking about the main bearings on the "crank shaft".If I am not in the right track ,please just disregard the post.Not long ago I was contacted by someone that works for a Mobile Division where...

Hello MVD All motors, or I should say most motors; have an overspeed capability that takes in consideration bearings and mechanical/electrical motor design in consideration.THis over speed is around 10% or so. You are talking about doubling the speed on this motor and notwithstanding the loss...

hello Damngr Last time I flashed the fields in a generator I used a 12 volt battery.Actually I had the wrong polarity,it was backwards ,so we reversed the leads and did it again.Eureka,we had power. It was a few years ago and I don't really remember the small detail, but for all its worth,if...

Hi sngpl Interesting post. I'll try to answer your questions in the order you post'em. 1-Generator capability shouldn't have changed after the new rewind. Caveat-Assuming that they did not use excessive temperature to burn the old wiring.Temperature in excess of 600 Deg will damage the...