Fender PD-250 Passport going into protect mode when running off 500 Watt Inverter

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  • tfs2015
    Senior Member
    • Feb 2015
    • 135
    • USA

    #1

    Fender PD-250 Passport going into protect mode when running off 500 Watt Inverter

    Dear members in the previous thread that I started, I posted about my Fender PD-250 Passport PA System. All the previous problems are fixed on it now, but now I have new problem that keeps coming up with it. I was running it off of a 500 Watt Power Inverter during a parade this past week. Anytime I would turn the output volume up to high it would go into PROTECT mode. Then I would have to shut it off wait a few minutes and then turn it back on. It would run for a little while and then go into PROTECT mode again. At home plugged into a normal household outlet it can run all day long with no problems at all. Should I turn the LEFT and RIGHT BIAS down on the power amp board so that it does not draw as much current? The specs on the inverter are:
    • Model: EN500 Energizer
    • Input: 12VDC 54A
    • Output: 115VAC 60Hz 4.4A 500W


    Thanks
    Tom
    Last edited by tfs2015; 07-19-2015, 08:13 PM. Reason: fix spelling error
    Computer and Small electronics troubleshooting and repair
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Fender PD-250 Passport going into protect mode when running off 500 Watt Inverter

    The Bias setting is set when the unit is in idling mode (no signal input), when the unit is fed with signal, then the bias in the output will vary with the amount of signal for the required out put to drive the speakers, lowing the bias current will not reduce the current draw when the amps are demanded to put out the required power. Less drive to the speakers = less current draw by the amplifiers = less current draw from the power supply = less current draw through the Inverter. 500W Inverter (it claims 500W continuous) does not look to be enough head room when high power are demanded by the amplifiers.
    Since it runs fine all day on AC SINE WAVE with no problem, then it has to be due to the step sine wave inverter problem.
    Did you run the same setup before the repair without any problem.
    Last edited by budm; 07-19-2015, 08:49 PM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • japlytic
      Badcaps Legend
      • Oct 2005
      • 2086
      • Australia

      #3
      Re: Fender PD-250 Passport going into protect mode when running off 500 Watt Inverter

      I have read in a Jaycar catalog that one of the things which are best for pure sinewave inverters is mains powered PA equipment.
      My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 8133
        • Canada

        #4
        Re: Fender PD-250 Passport going into protect mode when running off 500 Watt Inverter

        Probably you run out of juice from the cheap modified sine wave inverter. Some things don't run that great on modified sine wave inverters as they consume more power on that modified sine wave than on a true sine wave. There could be also a small problem on how you connected the inverter to the battery. Like is the inverter close to the battery or are the battery cables a half mile long etc.
        I really don't think it is the PA's fault.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Fender PD-250 Passport going into protect mode when running off 500 Watt Inverter

          Not sure if this true or not.
          http://www.themagiccafe.com/forums/v...44221&forum=11
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

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