Strange noise from APC?

Discussion in 'Mac Pro' started by sngraphics, Oct 29, 2012.

  1. sngraphics macrumors member

    Joined:
    Aug 27, 2010
    #1
    When I turn on my MacPro that is connected to my APC SMX1000, or when I wake it up a sudden and strange noise comes from the APC.
    It is like a metal sound popping or like metal hitting against metal is this a problem or a normal function when a sudden load hits the APC?
    Any info would be much appreciated because I can still return this unit if I have to.
     
  2. hfg macrumors 68040

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #2
    That does sort of sound like what my SmartUPS 1500 does when it goes into "self test" mode every few days. It scares my dog! :)

    My guess is that your 1000VA UPS can't handle the startup surge of a Mac Pro and thinks the power mains have failed and briefly goes into the full operational mode. May also happen when waking from sleep. You might want to consider a slightly more powerful UPS for the Mac Pro. They should normally be perfectly quiet when the UPS is on standby.
     

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