VRV went BANG ! Caught fire.

Discussion in 'General Electronics Chat' started by R!f@@, Apr 21, 2015.

  1. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
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    I thought this would be interesting to show.
    Yesterday attended a VRV and here is what I found.
    Board_s.jpg


    Nice huh.!!

    Check out the capacitors:D
    Caps_s.jpg

    I need to rewind the inductors though....any idea how should I go about it ? :confused:
     
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  2. pwdixon

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    Oct 11, 2012
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    What's a VRV?
     
  3. tom_s

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  4. pwdixon

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    I tried Google but it didn't look relevant....
     
  5. Dodgydave

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    Jun 22, 2012
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    is a Vrv an air conditioning unit...
     
  6. pwdixon

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    Google says yes but since the OP "attended a VRV" it could be something else.
     
  7. AnalogKid

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    I think he meant "attended to", as in worked on or tried to repair or something like that.

    ak
     
  8. R!f@@

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    I am fixing an AC unit. VRV type, which the compressor unit is on top of the building.
    It is an inverter type.
    Is it a slow blow a quicky. I cannot tell from the part number. It does not state it as a slow blow.
    U mean the compressor ??
     
  9. tom_s

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    Jun 27, 2014
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    was under the assumption sand filled fuses were slow blow and with a 20a rating, startup would be pulling close to that.

    is there a motor attached to that compressor? :)
     
  10. R!f@@

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    The compressor is 3 phase motor. You know inverter drive the VFD type.
    The only surge will be the caps initial charge current I think
     
  11. R!f@@

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    I have question about the inductor winding.
    The inductors are for EMI filtering.
    Each one has 4 isolated winding, 1 for each phase and 1 for neutral. 4 in total. Both inductors are in series.
    I need to wind just one. I unwound one and it has 15 turns. Due to the winding is I cannot tell the start or end but I know the direction.
    What would happen if I get confused in start and end of the winding ?
    Should all the winding be same direction or not ?
     
  12. DickCappels

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    Aug 21, 2008
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    If you have not already removed the wire from the core, you can merely note the directions of the windings with respect to one-another.
     
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  13. R!f@@

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    I guess It's fair to tell this VRV is fixed and running now
     
  14. ronv

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    Nov 12, 2008
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    That's what the electronics fairy does. She waves her magic wand over a circuit and it goes poof I'm a pile of s**t.
     
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  15. ian field

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    It certainly seems to have got well stuck into venting things.
     
  16. ian field

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    If you were a radio ham making an RF balun, you'd do a bifilar or trifillar winding by twisting 2 or 3 wires together and wind them on as if it was just one wire - but I suspect you'd run into insulation problems doing that with 3 phases and earth.

    You may be able to get PTFE wire, the insulation is good enough to be thinner and still do a lot better than enamel coating.
     
  17. R!f@@

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    I did say it is working now.
     
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