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  • exobar is tripping our eletrical circuit

    Hello people! just as the title says our exobar coffeemachine is tripping our eletrical circuit

    So what happened first? The coffee machine was just working fine since four weeks ago. After it kept tripping our electrical circuits. At the time I didn’t had the time to troubleshoot the issue.

    The machine itself has some been repaired once or twice. I think it was the same issue as right now. Last time they replaced the motherboard to solve this current issue. But to me the motherboard looks just fine.


    The condition of the machine: it is operating in a clean working environment, the machine is 8 year old, and it only received light maintenance.

    So last week I did some research about our machine, so I turned it on and it just worked fine (somehow). My aunt told me that the coffee machine was shutting itself down while it was building the pressure and heat. What I did was lower the amounts of bar to 1 (with the pressurestat) and replaced the pressure valve (because it made an irregular sound, the ‘sst ssstt’ sound). After that I seems to be working. After that I dropped my screwdriver into the machine ( didn’t hit anything) and I turned off the machine, to safely get my screwdriver out. When I turned our machine on again, it was tripping our electricity circuit again….

    The troubleshooting I worked on:

    I tried a different a different wall socket but no luck
    checked the conductivity of the heater elements, they all looked fine (all around 31 ohm orsomething).
    i also turned the machine on while the heating elements were plugged off, and the result was that the circuit got tripped
    unplugged the motherboard still a circuit trip
    I checked for unplugged cables, but everything looked fine.
    i measured the connectivity through some cables, seems fine
    I did not checked any relais
    wet spots, no electrical components were wet at the time.
    hmm maybe I just need to buy a new circuit motherboard… idunno haha

    some pictures:



    https://imgur.com/a/R0w6JpH

    if you guys know something i would like to hear it!

    P.S. sorry for my bad english

  • #2
    Welcome "justsaying4"

    This is not really the right thread for your problem mate.
    Better to post it in the Pointy End category if its replacement value is between $1500-$3000. Much more likely to get relevant responses...

    Mal.

    Comment


    • #3
      Well I would start at the beginning. Test the main power lead form active to earth and the same for neutral. Best if you can if you can do it with an earth leakage tester.
      When you unplugged the control board what did you unplug? Was is everything but the power input? or was it just some of the outputs? The control board will only have a small current pass through it giving power to each of the relays that passes the high current to things like elements. At least that is what I understand but the circuit diagram has a direct connection to the pump. Your elements (if 33ohm)will draw 7.7A each. Is this machine a 10A or 15A machine?
      The solenoids will draw a small current the pump should be the 2nd biggest draw after the elelment(s) I noticed the control board has a 3,15A fuse in it which is a bit of a strange marking (with a , and not a.)
      Anyway I hope you get it sorted. This is where I would start anyway.
      Please remember to play it safe when electricity is involved and if you are not sure don't touch it.

      Regards
      Crispy

      Comment


      • #4
        Originally posted by Crisp_image View Post
        Well I would start at the beginning. Test the main power lead form active to earth and the same for neutral. Best if you can if you can do it with an earth leakage tester.
        When you unplugged the control board what did you unplug? Was is everything but the power input? or was it just some of the outputs? The control board will only have a small current pass through it giving power to each of the relays that passes the high current to things like elements. At least that is what I understand but the circuit diagram has a direct connection to the pump. Your elements (if 33ohm)will draw 7.7A each. Is this machine a 10A or 15A machine?
        The solenoids will draw a small current the pump should be the 2nd biggest draw after the elelment(s) I noticed the control board has a 3,15A fuse in it which is a bit of a strange marking (with a , and not a.)
        Anyway I hope you get it sorted. This is where I would start anyway.
        Please remember to play it safe when electricity is involved and if you are not sure don't touch it.

        Regards
        Crispy
        Hey thanks for the response!

        I didn't test the main lead yet, because it looked very well isolated. But i will try it!

        I unplugged the in -and outputs. So if you look my 2nd picture you can see 2 green 'blocks' i i pulled those out.

        I don't know if its a 10 or 15 Ampere machine. I couldn't really find any technical specifications of this machine. Is it important to know?

        Wich ​​​​one Is draining more energy the solenoids or the pump? And what kind of pump is it? There is like a ac or dc motor underneath the circuit board, but im not sure if the motor is being used as a pump. Any suggestions on thto test the pump or solenoids?

        Comment


        • #5
          Originally posted by Dimal View Post
          Welcome "justsaying4"

          This is not really the right thread for your problem mate.
          Better to post it in the Pointy End category if its replacement value is between $1500-$3000. Much more likely to get relevant responses...

          Mal.
          Hey thanks for letting me know, but how do i replace my thread haha?

          Comment


          • #6
            Sounds like your element could be on the way out, it can be tested preferably with a megger (if you don’t know what one is then maybe get a technician) otherwise if the element is disconnected and the terminals protected then if it doesn’t trip then it’s most likely the element.

            Comment


            • #7
              I move it shortly after Mal posted that.


              Java "Click, click...zip!" phile
              Toys! I must have new toys!!!

              Comment


              • #8
                Originally posted by Fuelledbycoffee View Post
                Sounds like your element could be on the way out, it can be tested preferably with a megger (if you don’t know what one is then maybe get a technician) otherwise if the element is disconnected and the terminals protected then if it doesn’t trip then it’s most likely the element.
                i already checked it with a miltimeter (megger), see my first post in this thread: ''checked the conductivity of the heater elements, they all looked fine (all around 31 ohm orsomething).
                i also turned the machine on while the heating elements were plugged off, and the result was that the circuit got tripped''. thus the heating elements are working fine

                Comment


                • #9
                  It will have to be a process of elimination mate.
                  Disconnect one component at a time then recheck with DMM or Megger. Be very careful with electronic black boxes when meggering, easy to damage sensitive components: best to short out all terminals with fuse wire before you commence then remember to remove after testing.

                  All the above with power Off and plug removed from the power point of course.

                  Mal.

                  Comment


                  • #10
                    It would also help if you posted a picture of the specifications panel with the model number. I will take a guess as I have worked on a similar machine. That looks like an Expobar Megacreme 2 group from about 2008-2010. The should draw about 15 amps and has a 15 amp lead. Being a commercial machine it also has a rotary pump which driven by an electric motor which is just below the Gicar box.

                    Another thing you could have a look for is any damage to the 240v plugs from a power surge and/or damage to the main switch and terminals where the 240v lead terminates into the machine.


                    Comment


                    • #11
                      Originally posted by justsaying4 View Post

                      Hey thanks for the response!

                      I didn't test the main lead yet, because it looked very well isolated. But i will try it!

                      I unplugged the in -and outputs. So if you look my 2nd picture you can see 2 green 'blocks' i i pulled those out.

                      I don't know if its a 10 or 15 Ampere machine. I couldn't really find any technical specifications of this machine. Is it important to know?

                      Wich ​​​​one Is draining more energy the solenoids or the pump? And what kind of pump is it? There is like a ac or dc motor underneath the circuit board, but im not sure if the motor is being used as a pump. Any suggestions on thto test the pump or solenoids?
                      Google 10a plug and 15a plug. you will see a difference. With what you have said in this post I am concerned you may not have the knowledge to work on it alone safely. Find someone who had the knowledge and willing to share it with you.

                      Comment


                      • #12
                        Originally posted by roosterben View Post
                        It would also help if you posted a picture of the specifications panel with the model number. I will take a guess as I have worked on a similar machine. That looks like an Expobar Megacreme 2 group from about 2008-2010. The should draw about 15 amps and has a 15 amp lead. Being a commercial machine it also has a rotary pump which driven by an electric motor which is just below the Gicar box.

                        Another thing you could have a look for is any damage to the 240v plugs from a power surge and/or damage to the main switch and terminals where the 240v lead terminates into the machine.

                        I couldn't find the serie number, because our machine doesn't has a sticker with any details on it like serie number etc.

                        It looks like this model, but im not sure if its the same model

                        https://beanmachines.co.uk/product/e...resso-machine/

                        "Another thing you could have a look for is any damage to the 240v plugs from a power surge and/or damage to the main switch and terminals where the 240v lead terminates into the machine."

                        I will try it out!

                        Comment


                        • #13
                          Originally posted by Dimal View Post
                          It will have to be a process of elimination mate.
                          Disconnect one component at a time then recheck with DMM or Megger. Be very careful with electronic black boxes when meggering, easy to damage sensitive components: best to short out all terminals with fuse wire before you commence then remember to remove after testing.

                          All the above with power Off and plug removed from the power point of course.

                          Mal.
                          Trial no and errorw kind of work?, but thanks for the advice!

                          Comment


                          • #14
                            Originally posted by Crisp_image View Post

                            Google 10a plug and 15a plug. you will see a difference. With what you have said in this post I am concerned you may not have the knowledge to work on it alone safely. Find someone who had the knowledge and willing to share it with you.
                            Your kinda right, but I have enough knowledge to safely work on it. I won't take any risk and i always plug out the power plug if i need to measure something.

                            Comment


                            • #15
                              Originally posted by roosterben View Post
                              It would also help if you posted a picture of the specifications panel with the model number. I will take a guess as I have worked on a similar machine. That looks like an Expobar Megacreme 2 group from about 2008-2010. The should draw about 15 amps and has a 15 amp lead. Being a commercial machine it also has a rotary pump which driven by an electric motor which is just below the Gicar box.

                              Another thing you could have a look for is any damage to the 240v plugs from a power surge and/or damage to the main switch and terminals where the 240v lead terminates into the machine.

                              Found the machine tag
                              https://imgur.com/a/4Rwq2JM

                              Comment

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