Spot welder Thyristor failure

Discussion in 'General Electronics Chat' started by Abdel_Rahman, Oct 5, 2016.

  1. Abdel_Rahman

    Thread Starter Member

    Jul 19, 2016
    36
    0
    I have a spot welder has a problem with its thyristor, it has two back to back thyristors as indicated in the attached picture.

    Thyristors are used for applying voltage for a bout 100 ms to the transformer. one of the two thyristors has been defected due to a mistake in the control circuit :(
    the question is : can i remove that defected thyristor and apply only half wave to the transformer, has it any bad effect for transformer to add only positive part of the 380V wave??
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,733
    759
    Did you wonder why it was designed in that way in the first place ?
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,766
    1,101
    YES. The core will saturate and the magic smoke will escape.
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    Not if the main's breaker opens before the transformer burns out. :rolleyes:
     
    Last edited: Oct 5, 2016
Loading...