Capacitor problem?

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  • dvcochran
    New Member
    • Aug 2014
    • 3
    • USA
    #1

    Capacitor problem?

    Not sure if this is the right site but any help is appreciated.
    I have a small 2 horsepower 120VAC portable air compressor that starts fine on the line voltage in my shop. I have used it many times on a generator (5000 watt)but now it will not start when the pressure switch calls for it to run. The motor turns slowly until it trips out. If I discharge the air then compressor will start but even then it seems to struggle more than when it is connected to house current. I have tried it on two different generators with the same results. Any ideas?
    I have not tested the capacitor because it is starting fine on house current but here is the capacitor info:
    XUFENG
    CBB60 150uF +/- 5%
    250VAC C SH P0
    25/70/21 50/60HZ
    09.2008

    Thanks for your help,
    David Cochran
    Last edited by c_hegge; 08-06-2014, 06:45 PM. Reason: Removed phone number
    Tags: None
    • selldoor
      Slow Learner
      • Dec 2010
      • 7870
      #2
      Re: Capicitor problem?

      Aloing with many other things I know nothing about generators or compressors but I guessed the question may have been asked before so:
      https://uk.answers.yahoo.com/questio...7233931AAQkVba

      may go some way to helping.
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • PeteS in CA
          Badcaps Legend
          • Aug 2005
          • 3580
          • USA, Unsure of Planet
          #3
          Re: Capicitor problem?

          Are you sure it's 150uF and not, perhaps, 15uF. The 250VAC rating and the 5% tolerance suggest to me that it's a motor-run film capacitor, and 15uF seems to me a more reasonable value (maybe it's 15.0uF?). Motor run capacitors help heavily loaded motors start up, which is the problem you're trying to fix.
          PeteS in CA

          Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
          ****************************
          To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
          ****************************

            Comment

            • PeteS in CA
              Badcaps Legend
              • Aug 2005
              • 3580
              • USA, Unsure of Planet
              #4
              Re: Capicitor problem?

              BTW, I suggest removing the telephone # from your post, as BadCaps is visible publicly.
              PeteS in CA

              Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
              ****************************
              To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
              ****************************

                Comment

                • c_hegge
                  Badcaps Legend
                  • Sep 2009
                  • 5219
                  • Australia
                  #5
                  Re: Capacitor problem?

                  ^
                  Agreed. Phone numbers should never be made public like that. I fixed the spelling in the title too.
                  Last edited by c_hegge; 08-06-2014, 06:46 PM.
                  I love putting bad caps and flat batteries in fire and watching them explode!!

                  No wonder it doesn't work! You installed the jumper wires backwards

                  Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                  Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                    Comment

                    • pc7fan
                      Badcaps Veteran
                      • Aug 2013
                      • 52
                      • Canada
                      #6
                      Re: Capacitor problem?

                      ^
                      I agree too... phone numbers shouldn't be published in a public forum :p

                        Comment

                        • dvcochran
                          New Member
                          • Aug 2014
                          • 3
                          • USA
                          #7
                          Re: Capacitor problem?

                          Thank you for the warning about the phone number. It is removed. Can anyone help me with my problem? It may be a 15.0 uF capacitor and I just cannot see the period. I just know it starts fine on house current but not from two different generators. Any ideas?
                          Thanks,

                            Comment

                            • stj
                              Great Sage 齊天大聖
                              • Dec 2009
                              • 31015
                              • Albion
                              #8
                              Re: Capacitor problem?

                              got a foto of the cap?

                                Comment

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