Dc power supply in cnc not working

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  • shelby5041
    Badcaps Legend
    • Feb 2009
    • 1505
    • united states of america usa

    #61
    Re: Dc power supply in cnc not working

    and it makes me mad too becasue i screwed up...and now i have to replace a high quality component with crap made in china

    i put the wires off to the side pos to one side and neg to to other side so that when i hook bnoard back up i just hook up terminals accordingly...but since i have been working on this machine for a few days the wires got moved around by accident and when i went there today to hook the board back up ...BOOM!!!!!

    this cnc machine is ...was entirely made in USA even all the electronics

    oh well

    Comment

    • shelby5041
      Badcaps Legend
      • Feb 2009
      • 1505
      • united states of america usa

      #62
      Re: Dc power supply in cnc not working

      would it be ok to get a cap with diff uf value or do i need to stick with 4800uf? i know i can get higher voltage if better availability

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 8135
        • Canada

        #63
        Re: Dc power supply in cnc not working

        Mallroy = Cornell Dubilier - CDE
        you find them on digi or mouser. Probably $40 or so.

        Comment

        • shelby5041
          Badcaps Legend
          • Feb 2009
          • 1505
          • united states of america usa

          #64
          Re: Dc power supply in cnc not working

          awesome thanks i found them at mouser $40 plus shipping

          quite costly but thats what i get for screwing up

          Comment

          • eccerr0r
            Solder Sloth
            • Nov 2012
            • 8701
            • USA

            #65
            Re: Dc power supply in cnc not working

            Where's pictures of capacitor gore!

            Comment

            • shelby5041
              Badcaps Legend
              • Feb 2009
              • 1505
              • united states of america usa

              #66
              Re: Dc power supply in cnc not working

              hi

              i dont know
              i posted photo yesterday and it showed up and then now its gone

              will have to see if i can post anohter day as the photo is not on my pc

              one question though...this capacitor is about $40 new...if i can find a used one for real cheap under $10 would it be worth buying?

              as i said i wont be using this machine much at all ..maybe once in a great while....to me a good working used one wold be ok..just wanted some input from pros

              Comment

              • Per Hansson
                Super Moderator
                • Jul 2005
                • 5895
                • Sweden

                #67
                Re: Dc power supply in cnc not working

                $28 on this one, I'm not sure where the free shipping kicks in for US customer but I believe it is not that much higher?
                https://www2.mouser.com/ProductDetai...BL%252BQXG1g==
                "The one who says it cannot be done should never interrupt the one who is doing it."

                Comment

                • shelby5041
                  Badcaps Legend
                  • Feb 2009
                  • 1505
                  • united states of america usa

                  #68
                  Re: Dc power supply in cnc not working

                  hi hanson
                  i saw that one but its wrong dimensional size and would require some modifying which i dont want to do

                  i need 22mm screw holes spacing and 2in diameter

                  mouser shipping is $9 extra

                  Comment

                  • Per Hansson
                    Super Moderator
                    • Jul 2005
                    • 5895
                    • Sweden

                    #69
                    Re: Dc power supply in cnc not working

                    How about this then? Quite cheap too.

                    https://www.mouser.com/ProductDetail...5aE5RRng%3D%3D
                    "The one who says it cannot be done should never interrupt the one who is doing it."

                    Comment

                    • eccerr0r
                      Solder Sloth
                      • Nov 2012
                      • 8701
                      • USA

                      #70
                      Re: Dc power supply in cnc not working

                      I don't understand this quote on mouser's website: "Quantities greater than 33 will be subject to minimum order requirements."


                      ???

                      Comment

                      • shelby5041
                        Badcaps Legend
                        • Feb 2009
                        • 1505
                        • united states of america usa

                        #71
                        Re: Dc power supply in cnc not working

                        hi hanson

                        its a bit lower than 4800uf but im sure it would be ok considering the application
                        but it may be too tall not sure..original is 80mm tall



                        its possible it would fit..i may have to do some measuring..i have restrictions on height and diameter due to where its located unless as i said i do some modifyng which im not wanting to do

                        thanks

                        Comment

                        • Per Hansson
                          Super Moderator
                          • Jul 2005
                          • 5895
                          • Sweden

                          #72
                          Re: Dc power supply in cnc not working

                          Originally posted by eccerr0r
                          I don't understand this quote on mouser's website: "Quantities greater than 33 will be subject to minimum order requirements."


                          ???
                          They have 33 in stock, I think it means if you order more than 33 the additional ones you will not get the lower break prices on.
                          "The one who says it cannot be done should never interrupt the one who is doing it."

                          Comment

                          • redwire
                            Badcaps Legend
                            • Dec 2010
                            • 3906
                            • Canada

                            #73
                            Re: Dc power supply in cnc not working

                            I would bite the bullet and get the $40 part because newer or cheaper parts are smaller and will not fit the PC board 22mm screw spacings.
                            Cornell Dubilier - CDE CGS482U075V3C 4,800uF 75VDC $39 at Mouser

                            I don't see the high current path from the cap (+) to the load. Would need more board pictures to see where the voltage loss is occurring. There might be a fuse, open-connection etc. which is what I'd be looking for.
                            The LM338 would be OK if the output measures 5VDC for the logic circuits. They might act as the master switch for the 42VDC, if there is a relay or something.
                            So far I don't see any 42VDC regulator and it could be unregulated if powering high current solenoids etc.

                            Comment

                            • shelby5041
                              Badcaps Legend
                              • Feb 2009
                              • 1505
                              • united states of america usa

                              #74
                              Re: Dc power supply in cnc not working

                              Hi redwine
                              Thanks
                              I didnt want to spend 50$ total inc shipping....however i did get lucky and found exact part number on ebay used

                              I typicslly eould never buy a used cap but sibce this one is so costly new i made an exception

                              I only paid $7.50 snd free ship... i wanted to buy this new one but its 1in taller..wouldnt fit https://www.ebay.com/itm/14409611372....c100167.m2940

                              It was the only one on ebay that matched part number and made in USA

                              Plus ...there is risk that the ps could be bad...so spending 50$ on a non returnable item could be 50$ out the window

                              And also no fuses in circuit....i measured 44v at big cap so the issue would be the lm338 or a diode in citcuit since thats all thats in between cap and output ....my only concern is if the lm338 is bad if some other component blew the lm338...will see what happens when i get the cap and lm338...both ordered

                              )
                              Last edited by shelby5041; 09-05-2021, 05:08 AM.

                              Comment

                              • shelby5041
                                Badcaps Legend
                                • Feb 2009
                                • 1505
                                • united states of america usa

                                #75
                                Re: Dc power supply in cnc not working

                                Here are pics redwine
                                Attached Files
                                Last edited by shelby5041; 09-05-2021, 04:57 AM.

                                Comment

                                • shelby5041
                                  Badcaps Legend
                                  • Feb 2009
                                  • 1505
                                  • united states of america usa

                                  #76
                                  Re: Dc power supply in cnc not working

                                  Am i right to assume a mallory/cornell made in usa capscitor is as good or better quality .........as compared to made in china versions? And surprisingly the mallory csp is only rated for 2000hrs ....can they last longer than 2000hrs?..i would have thought it would be 5000 or maybe 10000 hour rated.
                                  Attached Files
                                  Last edited by shelby5041; 09-05-2021, 05:33 AM.

                                  Comment

                                  • sam_sam_sam
                                    Badcaps Legend
                                    • Jul 2011
                                    • 6037
                                    • USA

                                    #77
                                    Re: Dc power supply in cnc not working

                                    They can those ratings are based on using at the rated voltage maximum and at maximum temperature rating if used with in the normal range rating it should last a lot longer

                                    Comment

                                    • stj
                                      Great Sage 齊天大聖
                                      • Dec 2009
                                      • 31003
                                      • Albion

                                      #78
                                      Re: Dc power supply in cnc not working

                                      the rated hours is at maximum temperature, voltage and ripple.
                                      it's a minimum life.

                                      Comment

                                      • eccerr0r
                                        Solder Sloth
                                        • Nov 2012
                                        • 8701
                                        • USA

                                        #79
                                        Re: Dc power supply in cnc not working

                                        Those are lifes at the rated temperature. Life of capacitors are significantly improved if you keep them cool, the rule of thumb is double life each time you keep them 10°C cooler. Note that capacitors generate heat.

                                        Comment

                                        • shelby5041
                                          Badcaps Legend
                                          • Feb 2009
                                          • 1505
                                          • united states of america usa

                                          #80
                                          Re: Dc power supply in cnc not working

                                          Great info thanks...i think my decision to buy the used cap should be fine for my situation...there is a nice 4in 12v cooling fan inside the enclosure so that should keep the cap a bit cooler than normal
                                          Last edited by shelby5041; 09-05-2021, 07:27 AM.

                                          Comment

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