AC problem -breaker tripping

Discussion in 'Technical Repair' started by Subhashis Bag, Aug 4, 2016.

  1. Subhashis Bag

    Thread Starter New Member

    Aug 4, 2016
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    I hv a prob with my AC. Its a normal split ac. While starting its starting fine but while changing over to start capacitor to run capacitor mode its taking more current and breaker tripping off. insulation of compressor is ok
     
  2. SLK001

    Well-Known Member

    Nov 29, 2011
    812
    225
    Is your START/RUN switch sticking? Is the RUN capacitor bad?
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,515
    2,369
    Using a safe method, disconnect the start cap as soon as it comes up to full rpm.
    If problem cured it is the start cap/Centrifugal sw, (or current relay if used).
    If not, points to the run cap.
    Max.
     
  4. Subhashis Bag

    Thread Starter New Member

    Aug 4, 2016
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    i changed a new cap. but same prob? is there a problem with the compressor itself?
    staring coil having ohm 3.5 and running 3 ohm
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,515
    2,369
    Which cap? start or run?
    Run winding is always lower than start.
    Did you disconnect the start cap as suggested?
    Max.
     
  6. Subhashis Bag

    Thread Starter New Member

    Aug 4, 2016
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    0
    I
    I have a single capacitor which have a dual mode means it's has dual capacity inside. Capacitor is ok. Can you tell me after starting does any switch make/ break the circuit for the run and starting capacitor? Or both are in use while running.
     
  7. Subhashis Bag

    Thread Starter New Member

    Aug 4, 2016
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    Can you tell me after starting does any switch make/ break the circuit for the run and starting capacitor? Or both are in use while running.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    The centrifugal switch, if internal, opens after about 1/3 of the rotation speed.
    Only the run cap is in circuit all the time usually, the alternative to this type of sw is a external current relay, which releases after the current decreases.
    Max.
     
  9. Subhashis Bag

    Thread Starter New Member

    Aug 4, 2016
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    Is it necessary arrangements for a single phase motor ( external or internal arrangements). If the switch is faulty then is there a chance to take a heavy current?
     
  10. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,515
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    If the switch stays open the motor usually just hums and does not rotate, if closed, it can cause high current.
    Max.
     
  11. Subhashis Bag

    Thread Starter New Member

    Aug 4, 2016
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    Thanks a lot dear. I ll check the switch.
     
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