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Recent content by GusD

  1. GusD

    traction battery repair

    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
  2. GusD

    delta star motor connection

    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...
  3. GusD

    Rotor Testing.

    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...
  4. GusD

    Motor testing / repair

    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...
  5. GusD

    Detecting Broken Rotor Bars using Vibration Analysis

    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...
  6. GusD

    Suitable type of motor for a lead oxide mill

    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...
  7. GusD

    Which Multi Meter to buy

    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...
  8. GusD

    Motor Starting Ground Fault

    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...
  9. GusD

    Table Saw Wiring Upgrade challenge.

    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...
  10. GusD

    Why Harmonics in a three phase 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...
  11. GusD

    Fractional Slot Stator Windings ?

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

    Star-Delta motor cabling

    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...
  13. GusD

    ...from thread thread 237-66987 [c

    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
  14. GusD

    motor stopping rapidly during a fault

    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...
  15. GusD

    motor failure with locked rotor

    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...
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