Rewiring 380V 3 phase oven to 240V 3 phase

Discussion in 'General Electronics Chat' started by RobotHead, Feb 12, 2015.

  1. RobotHead

    Thread Starter New Member

    Feb 12, 2015
    5
    0
    Greetings fine electro buffs!

    I'm in the process of helping my mother build a Cafe for the summer. Unfortunately the dear went ahead and ordered an oven whilst I was away on holiday. We're now stuck with a 380-400V (50 HZ) behemoth and no adequate power supply ( closest connectable being 240V 3 phase on what I think is a 60A fuse).

    Here is the best diagram I could dig up on this Çözüm ER732, hope the quality suffices;
    DSC_0011.JPG
    Wired as Delta?


    I'd appreciate any guidance from the benevolent denizens of this fine forum. My mechanical engineering skills are up to scratch but my ability to decipher schematics is still a bit lackluster...
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,498
    2,364
    Appears to be over 6Kw? The simplest way out may be a 3ph 380/400 to 240 secondary 3ph transformer ran in reverse is probably the easiest solution, if you have 3ph available..
    Are you in N.A. or Europe?
    Max.
     
  3. RobotHead

    Thread Starter New Member

    Feb 12, 2015
    5
    0
    Thanks for the reply! I should've taken a pic of the model details before I left for home, nevertheless I recall seeing stamped 8Kw in the specifications... I'm in Northern Europe. Was dreading the best solution rounding down to utilizing a transformer, as they're most likely more expensive than the oven. Oh dear.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,498
    2,364
    Is there any way the supplier would take it back in exchange if unused?
    Even with a restocking fee it could be worth it?
    Max.
     
  5. RobotHead

    Thread Starter New Member

    Feb 12, 2015
    5
    0
    I'm calling tomorrow then, cheers for the nudge in a correct direction...
    Look forward to perusing a new forum out of this, at least!
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,498
    2,364
    Note: Service calls are extra.
    Max.;)
     
  7. Flare_Guy

    New Member

    Nov 18, 2012
    13
    1
    When you state 240 three phase are you referencing line to neutral / ground or line to line?

    upload_2015-2-12_23-4-15.png
    Only ask as it not uncommon to see 380VAC 3 phase @ 50Hz for services. If this what you have there the line to neutral 220 VAC the issue may only how the power supply is charcterized
     
    MaxHeadRoom likes this.
  8. #12

    Expert

    Nov 30, 2010
    16,247
    6,744
    240 radical 3 = 415
     
  9. Flare_Guy

    New Member

    Nov 18, 2012
    13
    1
    220 radical 3 = 381 or approximately 380, any how it was only an idea and worth the value spent for it :)
     
  10. JWHassler

    Member

    Sep 25, 2013
    201
    33
    If you are in Northern Europe AND have three-phase service, that range should work for you
     
  11. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,029
    1,620
    It's hard to read the schematic but it looks like the individual heater elements are running off of the 220 to common form each phase which means that they may be reconfigurable to run in a delta connection where you would move each heating elements common connection to a opposite phase of the one supplying it.

    Option two would be to use a common 115:230/230:460 setup to boost the 220 lines to a 355 volt level and run it that way. Granted you would be a bit low on the supply voltage so warm up times would be a little longer though.
     
  12. RobotHead

    Thread Starter New Member

    Feb 12, 2015
    5
    0
    Sorry for the late reply guys!

    I've been pondering the situation a little more, and might settle on this configuration. Haven't had the chance to check exactly what power supply the old building has as of yet so excuse my lack of detail...
    [​IMG]


    Does this look sensible to proceed with? I swear to spend the next couple years refining my electronics know how if it's totally off bearing...

    All the best!
     
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,498
    2,364
    You really need to confirm the type and details of supply you have?
    Max.
     
  14. RobotHead

    Thread Starter New Member

    Feb 12, 2015
    5
    0
    You're right, Max. I will never hastily compose a post after a saturday night out ever again. o_O
    I'm chuffed :)
     
  15. JWHassler

    Member

    Sep 25, 2013
    201
    33
    Both ends of one of your 'R2's are going to the same input line
     
Loading...