Announcement

Collapse
No announcement yet.

Bezzera BZ99 flips safety switch when pump loads up

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Bezzera BZ99 flips safety switch when pump loads up

    Hi everyone, first post, grateful for any advice.

    We have an old Bezzera BZ99 built before 2001 (ours for just over a year). Nice old machine makes great coffee, very happy.

    But recently it would flip the safety switch, outside on the powerboard, for the power circuit when the pump built up pressure. Must be shorting, no visible leaks inside when looking with the cover off.

    All other functions and circuitry is working fine.

    Does anyone have suggestions about what needs to be replaced? Guessing it is the pump or three way valve/solenoid?

    Thanks in advance. Rob from Melbourne.

  • #2
    Is the safety switch an overload protection or ground fault protection switch? Rotary pump or vibe pump?


    Java "Always more questions" phile
    Toys! I must have new toys!!!

    Comment


    • #3
      Thanks for the reply Javaphile, the pump is a vibe pump and the main power safety switch is a Hager NS 120 C20, can't find anything online about which type it is.

      Click image for larger version  Name:	IMG_2533.JPG Views:	0 Size:	14.8 ** ID:	883531

      Comment


      • level3ninja
        level3ninja commented
        Editing a comment
        That is a standard circuit breaker, with no earth leakage. It only trips for circuit overload over 20A relative to the C shaped trip curve. Explanations (listed in order of likelihood) are that the circuit is already very close to tripping and the pump nudges it over the edge, or when the pump loads up its current draw spikes, or the circuit breaker is faulty and tripping when it should not trip. A competent electrician will be able to diagnose further quite readily, especially if it happens every time.

      • fBezzeraBZ99
        fBezzeraBZ99 commented
        Editing a comment
        Thanks level3ninja, yes that is the power circuit breaker that trips, I will post a bigger image.

    • #4
      G'day Rob,
      can you clarify if that circuit breaker (the one in your picture) is tripping, or is there another safety switch within your board that is tripping?

      Comment


      • #5
        Here is a bigger image of the power circuit switches. Click image for larger version

Name:	PowerCBSwitches.png
Views:	213
Size:	430.2 KB
ID:	883811

        Comment


        • #6
          Originally posted by Lovey View Post
          G'day Rob,
          can you clarify if that circuit breaker (the one in your picture) is tripping, or is there another safety switch within your board that is tripping?
          Thanks Lovely, yes it is the first one of the three power circuit switches shown in the image of more of the actual switches.

          From memory nothing else significant is running on the circuit, just the fridge and wireless modem/router. It never used to be a problem and it does trip the safety switch each time the pump loads up. We can run the pump as long as we like with no load, no problem.

          Comment


          • Lovey
            Lovey commented
            Editing a comment
            Sorry to be as pest with the questions, but is it the circuit breaker (the one marked as C20) or the safety switch (as marked) that is tripping, as at different times you've mentioned both are tripping?

          • fBezzeraBZ99
            fBezzeraBZ99 commented
            Editing a comment
            Thanks Lovey, sorry got your Name/ID wrong. Good question, it is actually the C20 MCB, Micro Circuit Breaker that flips not the safety switch. Sorry, I had never really looked at all the switches that closely before.

        • #7
          Just a random thought here of one possibility - if it only trips when the pump loads up - the BZ99 has a couple of opv return hoses (depending on model, age etc) when those open up, excess water is diverted back to the tank - check the clear silicon hoses are not split, they usually split near the end brass piece . If they leak and water could be leaking onto solenoids etc, so it would only trip when opv opens, but not during free flow . I had it happen once....

          Comment


          • fBezzeraBZ99
            fBezzeraBZ99 commented
            Editing a comment
            Yes it is pretty old, has metal riveted ID plate on front instead of sticker, so before 2006 I think that means. It was restored by my good friend Simon here on coffee snobs not long ago and I had a careful look inside last time, no leaks visible.

            But will open her up again tomorrow to double check those hoses.

            Thanks, good thought.

        • #8
          Sorry for the delay in getting back to everybody, machine was disconnected and not plumbed.

          Have re-connected and tested again and there is no visible leaks during pump operation. So it is unlikely a short due to water leakage..

          Thanks, Rob

          Comment


          • #9
            Looks like you will need to pursue the possibilities posed by 'ninja above...

            Mal.

            level3ninja commented
            2 weeks ago

            That is a standard circuit breaker, with no earth leakage. It only trips for circuit overload over 20A relative to the C shaped trip curve. Explanations (listed in order of likelihood) are that the circuit is already very close to tripping and the pump nudges it over the edge, or when the pump loads up its current draw spikes, or the circuit breaker is faulty and tripping when it should not trip. A competent electrician will be able to diagnose further quite readily, especially if it happens every time.

            Comment


            • fBezzeraBZ99
              fBezzeraBZ99 commented
              Editing a comment
              Thanks, will order a new pump and put it ini and see what happens.

          • #10
            did you fix this issue? I had my circuit breaker tripping my problem was water in the contacts

            Comment

            Working...
            X