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  • Users: jOmega
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  1. jOmega

    IEC Motor Question

    From the appropriate IEC standard, (not motor vendor's catalogue) ... what is the required length of the motor shaft keyway for a 100 frame motor. Thanks, jOmega
  2. jOmega

    Specifying the Right Fuse for Circuit Protection

    Choosing a fuse isn’t what it used to be. Know the basics before you specify them http://ecmweb.com/ar/electric_specifying_right_fuse/index.htm j&#937
  3. jOmega

    DC Motors : Constant HP vs Constant Torque

    jbartos: Josef -- The following is offered in response to your comments in the thread...DC Motor brush life....thread237-77159 "///Motor load is often considered with a constant shaft load (HP). Since HP~Watts=ExI, then the only way to preserve the relationship for E decreasing is by I...
  4. jOmega

    VFD-Long Term Affect on Motors

    Any one know of or able to provide a reference to a study on the long term affects of VFDs on motors ? Colleague in Italy has asked for some information thereof. Much appreciated. jOmega
  5. jOmega

    Strange Voltages

    Gentlemen: Phase-to-Phase voltage is 240-240-240 Phase-to-ground is 120 120 208 Theories, Ideas, Explanations, greatly appreciated. jOmega
  6. jOmega

    MTBF & the Land of Make Believe

    JBartos, in a previous thread (#237-69725), stated: "Suggestion: There are VFD manufacturers that offer Mean Time Between Failure (MBTF) values for their products off the assembly line; however, not for the custom-made products, e.g. ABB" To which we replied that MTBF is a crafted...
  7. jOmega

    Utility Impedance & Isc

    2000 kVA transformer 4160 / 480 5%IZ What would be a reasonable assumption or WAG .. for available Short Circuit Amps ... and impedance on the utility side (4160) Thanks .. jOmega
  8. jOmega

    ...from thread thread 237-66987 [c

    ...from thread thread 237-66987 Use of VFD output side contacter for E-stop jOmega said: "Any contactor that is rated my its manufacturer for ac motor duty, is ok. Suggest NEMA rated as opposed to IEC as an IEC contactor will likely shorten motor life." ScottyUK asked what the...
  9. jOmega

    Wanted: PC Software for Motor Control Design

    The below was received by dridoc@email.com and was forwarded with a request to post it in this form with the hope that the members might have some advice for Mr. Lyman Thank you, all. jOmega ---------------------------------------------- Hello ! I'm looking for very simple, low-cost PC...

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