maximum operating current

Discussion in 'General Electronics Chat' started by h.d, Oct 13, 2008.

  1. h.d

    Thread Starter Active Member

    Oct 22, 2007
    150
    0
    hi all,
    i have a compressor , i want to design the power and control circuit for it
    so i should determine the maximum opperating current of it
    so i know that the max. opperating cuurent= input power/operating voltage
    ist right?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Maximum current = maximum input power / voltage

    Current will be higher when the motor is first starting up. This initial surge can be six or more times the current at running speed.
     
  3. h.d

    Thread Starter Active Member

    Oct 22, 2007
    150
    0
    yes, the starting current = (6-7) times the nominal current.
     
  4. h.d

    Thread Starter Active Member

    Oct 22, 2007
    150
    0
    yes. but i mean the max. op. current. becuase when you choose the C.B and contactor ou select it depending on the max. op. current no the nominal operating current.
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    You are correct. I would add an extra 20% or more above the inrush, just to allow for unforeseen circumstances.
     
  6. h.d

    Thread Starter Active Member

    Oct 22, 2007
    150
    0
    yes thats right......
     
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