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  • Capacitor go BOOM

    Lane 37 has been acting up for a month now. First, the upper contact broke and took CSM2 with it, no big deal. Then two weeks later, another capacitor went on its own. Today,another one bit it and the sweep motor caught on fire. We have SS chassis with omega teks and expanders, national motors. We have been through the wire way, replaced the chassis and motor, and both capacitors. It doesn't seem to happen for a couple o' weeks at a time, then spoo everywhere. Getting to the head scratching point, and any tips I've overlooked would be helpful.

    Humbly yours,

    John
    My mom always said there was one crazy person on every bus,... but I could never find him.

  • #2
    Re: Capacitor go BOOM

    Although you say you changed the chassis it looks like a bad contactor(upper and lower contacts both making contact) that is feeding 110V(115V for triac) directly to the capicitor.

    Boom
    So it goes.

    Comment


    • #3
      Re: Capacitor go BOOM

      smokey make sure the resistors on the side of the capacitor holders arent touching each other that could cause that problem or maybe even 1 of them are broken on the inside.they have 3 terminals sticking off them and are round..good luck let us know your outcome!
      DEFINITION OF MANAGER IN THE 21ST CENTURY: (ADULT BABYSITTER)

      Comment


      • #4
        Re: Capacitor go BOOM

        Yea, if the motor tries running BOTH ways at the same time *BOM* goes the cap. If the contactor is sticking, replace it.
        I've had enough of hope & chains.

        Comment


        • #5
          Re: Capacitor go BOOM

          We haven't had a cap go nuclear in quite a while... I guess they're getting old and are too tired to detonate. Most of the time, they just leak out noxious gray funk all over the front wireway.
          <span style="font-style: italic">Educatio est omnium efficacissima forma rebellionis</span>

          Comment


          • #6
            Re: Capacitor go BOOM

            John,
            Have never had any experience with National motors. Here is my story wirh G.E. motors on 30's.
            If you are using the old Allen Bradley contactors, check the screw in the bottom moveable contact. If it is loose or missing, upper and lower contacts are making contact and the motor is trying to run and stop at the same time.
            With this senario we have had the capacitors explode, blowing our loose fitting cover off the motor and fill a four machine area with black plastic and white confetti.

            Is this a shorting of the capacitors across the main winding????

            Comment


            • #7
              Re: Capacitor go BOOM

              I went through it myself today, and verified Smokie missed nothing. I put a chassis with bowltronics SS contactor replacments on, and moved the orignal chassis to lane 36. Discharge resistors are not touching anything. No metal fragments on the wireway, but I tested the motor (just for kicks) on another lane (just on catwalk) and it ran with and wouldent go off, sparky sparky, and there is no continuity in the klixon. My theory (for now) is that the last time this happened, 2 wires may have melted a little insulation, and the motor was getting power pastt he klixon. Needless to say, all wires were one solid glob of gunk by the time I got to disassemble the stator. I think the orignal problem led to dammage in the motor, and the motor actualy caused it this time. Any more ideal, dont hesitate to chime in.

              Paul

              Comment


              • #8
                Re: Capacitor go BOOM

                Good job, Paul. You have morew time on ur hands than I do... [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]
                I've had enough of hope & chains.

                Comment


                • #9
                  Re: Capacitor go BOOM

                  One could look at the sweep reverse run switch. It is a 2 pole switch. If one of the poles stick closed, the motor tries to run both ways.

                  Comment


                  • #10
                    Re: Capacitor go BOOM

                    We had a similar problem once. The problem disappeared when we changed all 4 capacitiors, just on the off chance there was a wiring problem somewhere.

                    What we later found out was the sticker's above the capacitiors were in the wrong places. When we were actually changing the 2 sweep capacitiors, we were changing 1 sweep and 1 table capacitor.

                    When we tested the capacitors in the machine they all appeared ok. But the problem never returned, once all 4 had been changed.

                    Strange but true !

                    Comment


                    • #11
                      Re: Capacitor go BOOM

                      Hey Smokey

                      I would seriously consider that while in your work area that you wear a good quality hard hat (football helmit with full face guard might be better). Asbestes fire suit with kevlar gloves. Don't forget the steel toed work boots. Skin grafts are painfull.

                      Good Luck
                      Mike

                      Comment


                      • #12
                        Re: Capacitor go BOOM

                        Originally posted by hmmmm:
                        We had a similar problem once. The problem disappeared when we changed all 4 capacitiors, just on the off chance there was a wiring problem somewhere.

                        What we later found out was the sticker's above the capacitiors were in the wrong places. When we were actually changing the 2 sweep capacitiors, we were changing 1 sweep and 1 table capacitor.

                        When we tested the capacitors in the machine they all appeared ok. But the problem never returned, once all 4 had been changed.

                        Strange but true !
                        <font size="2" face="Verdana, Helvetica, sans-serif">The place I do service work has the caps on lane 1 mis-labeled.....it caused me some major headaches.

                        DO NOT TRUST THE CAP LABELS.

                        Comment


                        • #13
                          Re: Capacitor go BOOM

                          check the motor heads and all the wiring like it was said the resistors might be touching on the side of the capacitor but something is grounded or you are putting the wrong capacitors in check it out and let me know

                          Comment


                          • #14
                            Re: Capacitor go BOOM

                            Originally posted by GPS:
                            Hey Smokey

                            I would seriously consider that while in your work area that you wear a good quality hard hat (football helmit with full face guard might be better). Asbestes fire suit with kevlar gloves. Don't forget the steel toed work boots. Skin grafts are painfull.

                            Good Luck
                            Mike
                            <font size="2" face="Verdana, Helvetica, sans-serif">Ding fries are done [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]

                            Seriously though, the caps are not mislabeled, and have been replaced twice now. The origonal problem a month ago was the allen bradley went bad. Since then, perhaps this lane has a demon. The power of christ compells it, to STOP blowing capacitors [img]/content/btubb/images/%%GRAEMLIN_URL%%/mad.gif[/img]
                            My mom always said there was one crazy person on every bus,... but I could never find him.

                            Comment


                            • #15
                              Re: Capacitor go BOOM

                              If it's not the contactor clean your CA1 plug, a carbon? layer can build up there causing a unwanted connection.
                              So it goes.

                              Comment

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