Recent content by Mahmoud-Diaa

  1. M

    Induction motor Acceleration/starting time

    Here is attached the motor datasheet, I don't have the documents for the whole set at the moment, but I can tell you that it is a D.O.L start motor coupled to a high inertia fan via a gear box
  2. M

    Induction motor Acceleration/starting time

    Hello Fellows, Does anybody experienced the impact of increased fan starting torque on the acceleration time of the motor? and has it an effect on the starting current?Is there an equation which relates the "starting" torque and current? Is there a practical method for measuring the starting...
  3. M

    Repeated motor winding failure of IngersollRand Screw Air Compressors 75 kW

    Still I didn`t get the feedback from Ingersoll-Rand.
  4. M

    Frequent failure of 3 phase monitoring relay

    Hello Colleagues, We have a 3phase monitoring relay(ABB CM-PAS) is being failing very frequently. The auto reset function is not working and I have to raise the Asymm settings up to 20% to reset the alarm and return it back to the desirable value. This issue was repeated in more than 6 relays...
  5. M

    Repeated motor winding failure of IngersollRand Screw Air Compressors 75 kW

    Thank you MicrobicTomb for your feedback. We have changes 3 motors within 1 year. Would you please clarify what do you mean by " Protections are device specific"? Thank you!
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    Repeated motor winding failure of IngersollRand Screw Air Compressors 75 kW

    Hello Colleagues, What can be the root cause of repeated winding failure of two identical 75KW air compressors motors? The motors are controlled via a VSD. No earth fault was detected. So, Is it only about wrong settings? Does anybody knows about the overcurrent and short circuit protection...
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