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  • Users: macmckim
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  1. macmckim

    10P-1000HP - Shaft Hunting

    Good Day Have issue with a 1000HP, 10P (713 RPM) 4kv / 60HZ, TEAAC compressor motor - VFD powered - Variable torque application. Motor is direct coupled (flexible coupling) to VRU ring compressor and is VFD power from 660 - 740 RPM (fully loaded) The motor shaft starts hunting - movement...
  2. macmckim

    Decaying Motor Voltage

    Does anyone have a good read on the subject of when we have a Main Bus A -Tie-Main Bus B system where one of the main “B” transformer failed and need to close my tie breaker to avoid all the motors shutdown on bus “B”. Is there a time cycle where I can catch motor before I will do damage to...
  3. macmckim

    Zone 2 / Div 2, VFD Duty Motor with Insulated NDE Bearing

    I have an application for a 6P-250HP, Class 1, Zone 2 / Div. 2, VFD duty motor, PD Pump, CT application, V-Belt with an insulation NDE bearing on jack pump (oil) application. My pump OEM has advise me that his motor supplier has declined to quote, because it's their policy not quote motors in...
  4. macmckim

    4160 versus 13,800V motors - Pro's & Con's

    I have an end-user with number of 4P-5000HP, 4160V motors that are 25+ years old on large pumps that we have repaired or over-hauled number number times in past 10 years. The end-user is looking at replacing the motors wih new machines in next couple of years. The idea the in-house engineer is...
  5. macmckim

    Lighting Arrestors for 4kV motors

    Have a question from electrical engineer regarding lighting arrestors. Does any one know the difference between the two types? a) station class b) distribution class What type should be used for 4kV induction motor?
  6. macmckim

    Question about ATEX

    I have a pump client that is shipping pumps packages to Ireland (from US) and is asking for a standard TEFC motor for use in unclassified areas. Motor must be CE approved and meet European Machinery Directive 98/37/EEC. The customer has told me this Directive means compliance to ATEX...
  7. macmckim

    10KV Delta Power Supply vs Star Connected Motor

    Have a plant with a incoming 10KV Delta power supply. The motor has a Wye winding connection.The difference between Delta and Wye is in the voltage between the phases and neutral. It was my understanding that if the plant provided a 10 KV Delta feed and the motor was wired for a Wye feed, that...
  8. macmckim

    Plugging Switch Question

    Have request from client at power plant (US) to supply a plugging switch for a large induction motor used on a ID fan. Client want it for motor protection in stop operation staff from restarting the motor if motor overheats or stalls. Do no have any experience with this device and would...
  9. macmckim

    IEC - Method of cooling -Nomenclature - help

    I am trying to find a web site or documentation that explains IEC - Method of Cooling nomenclature. I have a inquiry from a client that requires IC616. Any assistance would be greatly appreciated.

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