[EMS Discuss] Magnetic Device Troubleshooting

Sat Aug 31 07:49:11 PDT 2013

Hmmm.  Have you actually put a meter on the gate of the MOSFET

> I have a device overview sketch that I am attaching to this post to help
> everyone get a bit of an idea of what the heck they are trying to help me
> with :D
> On Thu, Aug 22, 2013 at 6:45 PM, Cord Slatton <EMAIL HIDDEN> wrote:
>> Hello All!
>> I have a device that I can only say so much about due to an NDA but I am
>> having a problem with and need a bit of advice. If I have not given enough
>> info or a diagram (though I cannot be too detailed on certain aspects) is
>> needed, please let me know.
>> Thanks so much!
>> ------------------------------------------------------------------------------------------------------
>> I have Arduino based controller that turns on a single control board
>> input, which turns on one of 4 individual mosfet banks. When a mosfet bank
>> is on it allows current to flow which turns on an electromagnet.
>> The magnets are hooked to the main power bus, all the same way, one side
>> going to positive and one to negative with a mosfet bank keeping it from
>> being always on.
>> There is a bit of something in the magnet connector that is supposed to
>> cancel backflow EMF that could damage the controller, I am not positive
>> what is going on with that but it is super simple part wise, and I can get
>> the part number and post it if needed.
>> This system used to work correctly in the past the way it is wired, but
>> not when I had it in my possession.
>> Problem: When a magnet is activated another magnet is always active at the
>> same time.
>> Known Information
>>    1. The Arduino controller and the control board are working correctly.
>>    It sends a pulse to the correct mosfet bank. The correct indicator light
>>    activates and high voltage is sent to the corresponding mosfet bank.
>>    2. The mosfet banks seem to be working correctly, only the one
>>    receiving a signal activates.
>>    3. The magnet that is triggered by the controller does
>>    activate(correct behavior).
>>    4. The incorrectly triggering magnet is not triggered through
>>    induction and proximity does not matter.
>>    5. The same pairs of magnets always activate, even if rewired to the
>>    power supply in different configurations(magnets 1 & 4, 2 & 3)
>>    6. The only way to get a single magnet to activate is to remove it's
>>    paired magnet from the machine.
>>    7. The Arduino based controller I built is connected thusly: a ground
>>    wire to share the circuit's common ground and 4 control wires, each to
>>    individually turn on the pins on the device control board that drive the
>>    mosfets.
>>    8. Changing out the Arduino based controller for another control
>>    method(or manual control) does not change the behavior of the machine
>> --------------------------------------------------------------------------------------------------
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