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Thread: magnasine ms2712e inverte charger not working

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    Default magnasine ms2712e inverte charger not working

    I have inherited a magnasine ms-2712e inverter charger i need to find someone in WA that has a remote control unit that i can use to run the diagnostics and set up unit if i manage to repair it



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    After some disassembly found FETs blown does any one know what type are used in these units markings have faded and unreadable

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    You can make a pretty good guess as long as you know what voltage they're switching IE if the fet(s) are switching rectified mains 240V RMS the peak voltage will be around 315V DC so you need at least a 650V rating to allow for spikes generated by an inductive load like a transformer and that's only as long as the snubbing components are OK (which they may not be after a major failure so check carefully all components on the primary side of the transformer). The typical snubbing network consists of a HV capacitor, a resistor and a reverse biased fast diode.

    Do not go probing with the mains connected (dangerous unless you know how to do it with adequate safety)

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    they are on the 12v side of the transformer but are a 100amp charger

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    With a basic idea of the required minimum ratings (voltage, current, on resistance) a bit of browsing at Element14 should turn up a list of candidates in the right package (TO220 or TO247 etc). Does it have the mosfets operating in parallel or is it a push-pull type design?

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    this you tube is of the 2012 which is just a few fets short of the 2712

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    Impressive unit going by the video linked above
    Are all the fets destroyed to the extent that no numbers can be read on them? - seems there'll be quite a lot of them
    Also are they all N-channel?
    There's a range of Fets in that SMD packaging but you'll be up for a bit of cash if there's dozens to replace
    EG

    Something I took from the video - how are the cooling fans?
    and do you have the diagnostic head unit (remote control)?

    The video indicates 2 banks of parallel FETs which I'd assume to be 1 bank for the charger function and the other for inverter operation - I can see a difference in FETs between the 2 banks (1 bank has soldered drain pins (centre pin) and the other has clipped centre pins so the soldered tab is the drain connection). Could simply be that the charger mode uses less robust devices than inverter mode and they saved some money with cheaper devices there.
    Last edited by Skepticist; 03-05-19 at 11:18 PM.

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    in the staart i said looking for head unit fans ok ntcs on trany and system board test ok
    there appears to be 2 banks of 12 fets one +ve side blown there is another video on you tube with it stripped but no info to fets all have cliped pin and so are all solder to system board by the body need to get a bigger soldering iron next pension day. one fet completely blown but an inspection of others show over heating to point of heat sink solder testing shows shorts on others but as paralleled may only be one will know when i get them out unfortunately the screen printing on them is to faint to read may be due to overheating or the insulating heat sponge that sat on top of them this video is for bigger unit but same construction

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    The first challenge will be removing a FET without damaging the PCB and adjacent components, could take more than a bigger soldering iron to do that. Something like a hot air rework station so you have to work out how much to invest in this to still achieve an economical repair.

    I saw the price of the 'remote control' units :O so I shudder to think what they'd be asking for a replacement fully assembled FET PCB (plug n play).

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    $600 plus us for new board

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