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Miller Boost Circuit Board Assembly NO. 200841

lanuser

Hello everyone,

Let me tell you small story

While back I have purchased dead  "MIller Dynasty 200DX"

After some repairs I have found damage to Boost Board that has internal ground planes  burnedout.

I have realisedthat i would need board replacement, however, board is dicontiniued and replacement board will cost me 2000 dollars if I found one.

After fiew hundret emails  and phone calls to different suppliers without even one ansfer I have desided  recreate board from scrach and make my own.

Fiew month later after reverse engineering pcb to schematic  and later on from schematic to PCB i have finally received new boards.

I have solder necesseryparts and run test on new assembled board, however, I have forgot take a maguments from resistor R86

Could some one be so kind and provide value number between pin 2 & 3 on R86?

Here is some pictures from original board and final my creation:

 

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  • +1

    The value of R86 as it says in the technical manual adjusts the limit for the line current, by default it is approximately 10 ohms. R86 makes a voltage divider with R99 adjusted from 0 to 7.5V approximately, it is compared with the current of the HD1 transducer of 6.25A per volt. For example if you want to limit it to 43 amp, you would have to adjust the voltage divider R86 and R99 to 7Volts.

  • 0 in reply to A3JBNE

    I do not know where you'll able to get your information, however, you are correct R86 designed for IGBT control on main power distribution board.

    The reason I request information because I do not  want for voltage overshoot at initial power on.  Main IGBT hard to come by now days.

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  • 0 in reply to A3JBNE

    I do not know where you'll able to get your information, however, you are correct R86 designed for IGBT control on main power distribution board.

    The reason I request information because I do not  want for voltage overshoot at initial power on.  Main IGBT hard to come by now days.

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