grblshield capactitor burned up

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  • February 7, 2013 at 10:04 pm #3744
    socketcap
    Member

    Well after a long learning curve I finally got my V2 GRBLshield working.

    I purchased 3 400 step motors from Sparkfun rated at 1.7 amps per coil, I followed a thread here that mentioned using Coolterm instead of the arduino terminal program.

    Got all three motors turning last night with some simple gcode pasted into coolterm.

    The polarity to the board was absolutely correct, but after about 10 minutes of being powered up a capacitor named C1 burned up and now its dead, I think maybe the arduino uno might be dead too.

    Could this be repaired and could I find out what I need to do to avoid this in the future?

    Sincerely,

    Colin Morris

    February 7, 2013 at 10:07 pm #3745
    socketcap
    Member

    oops I spelled capacitor wrong fifty whacks with a wet noodle

    February 8, 2013 at 11:17 am #3748
    alden
    Member

    By way of diagnosis, what power supply were you using and what voltage is it providing to the board? How was the Arduin Uno powered and how do you think it’s dead, too?

    February 8, 2013 at 12:28 pm #3749
    socketcap
    Member

    I have a 120 to 24 volt dc power supply rated at 10 amps and I adjusted the pot on the power supply to 24 volts exactly.
    I am not sure what the mfg is as it is not in a case with labels. The only writing is on the board indicating the power required on the input, I verified the polarity of the output with a meter and I did not connect it backwards.

    The arduino was powered with the USB cable.

    The arduino power led lights only when the grblshield is dissconnected and the arduino power led is very dim.

    Maybe I am wrong about the arduino, I guess I wont know if its ok until the grblshield is repaired.

    February 10, 2013 at 10:40 am #3761
    Riley
    Keymaster

    You can test to see if the arduino is fine by just not placing the shield on the arduino and seeing if you get the normal Prompt on reset or power on in the terminal.

    February 10, 2013 at 9:32 pm #3764
    socketcap
    Member

    I tested the arduino this evening by itself with out shield connected.

    The normal sound and detection that happens in windows when the usb cable is plugged into it is absent, the surface mount power led is very dim.

    Are the grbl shields repairable?

    Could you or Alden tell me what might have gone bad to cause the component “C1” that is to the left of “J2 and J3” to burn out ? and consequently the arduino too. Perhaps I did something wrong although I am not sure what that might be.

    Is there a certain characteristic/feature in a power supply that might cause C1 to burn out?

    Are there additional circuits that are required that protect the shield and arduino that I am not aware of?

    In your documentation the polarity is pointed out several times and unless my power supply decided on it own to switch places internally, that was not the problem.

    I have been playing with equipment a long time and have never connected anything backwards.

    I had a 12volt fan blowing on the grblshield the whole time.

    I purchased 2 used power supplies that are identical and I was assured that they had 120 volt input voltage requirements but in looking closely (this evening) at the board it is printed 250 volts 6amp input.

    Bummer maybe I did cause this by having 120 fed into a 250 power supply unless that rating means it accepts both. O well hopefully I can get the grbl shield repaired.

    February 11, 2013 at 12:12 pm #3766
    socketcap
    Member

    I checked with mfg of the power supplies today. “TDK lambda” said their power supplies have auto ranging inputs and can accept 90 to 250 volts ac 50/60 hz and have precision regulator circuits on the output.

    So 120 vac input was within limits for this application.

    February 11, 2013 at 8:25 pm #3768
    socketcap
    Member

    Alden or Riley,

    Can you please tell me if my grbl shield is repairable?

    February 20, 2013 at 4:43 pm #3784
    Riley
    Keymaster

    I asked you to tell me if you got the prompt on the arduino on Feb 10th.  You never responded to my question.  We have a lot to deal with, we cannot help you if you do not give us the tools we need to troubleshoot.

    I tested the arduino this evening by itself with out shield connected.

    The normal sound and detection that happens in windows when the usb cable is plugged into it is absent, the surface mount power led is very dim.

    Does not tell me if your arduino was able to see the grblShield prompt in your terminal.  Also if you would like to send your grblShield back that is fine.  We do charge a re-work fee if the polarity was reversed.  Its fairly easy to tell if this happened.

    Upon answering of my initial question.  What would you like to do?

    Riley

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