Noisy power supply when running of UPS? Is this normal?

Iv recently purchased a belkin 1500VA UPS, which in the near future i was looking to use on MAC Pro (once iv actually ordered and received it) The price was to good to miss, as it was currently on offer at misco and quite heavely reduced. So i went ahead thinking it would be a good idea to have for my G5 anyway. Everything setup a treat and the built OSX controls are fine but when the unit is on battery backup. Sleeping or in normal usage the actually G5's power supply makes a buzzing electrical sound from the power supply? I have read about this a little else-wear but no one has yet confirmed if this is normal/acceptable for a G5 to do this. Or the that the noise is the sign of a dodgy/faulty power supply.
I am aware the UPS also makes a noise when running in backup mode. But the UPS and the tower are some distance apart so i can quite easily identify that the noise is coming from the G5.
Any user experiences or advice on this would be much appreciate. I dont want to burn my power supply out. I still love my G5 very much. Cheers in advance for anyones assistance. Pob

Thankyou everyone for all of your responces. I think we're getting to the bottom of things now. It would appear that when in battery back up mode my UPS is generating a square wave which my powermac is not liking at all. And the power supply is working to put this right. Weather the work the power supply is doing and the noise generated is a sign of harm to my computer is still some what unclear. But it does not seem like a good noise as it is not normal.
It is also interesting that maclover has no problems using an APC smart ups that produces sine wave. So this points to square wave being the saurce of problems. Thankyou maclover for also pointing out that other very useful thread that concludes the smart ups range seems to be the way to go. Even tho a little more money i would prefer to have no noise! And be sure im not harming my Mac.
Malcolm Rayfield - I am under the impression my UPS does no produce a sine wave. And you saying that the noise is the input filter sorting it out does make sense. I am going to contact Belking and Apple tomorrow and hopefully either way confirm that this noise is a bad thing or just something iv got to live with.
DaddyPaycheck - My belkin model number is F6C1500EITW-RK. Quite a new model i think, dual form, 1500VA. Very pleased with all the features. This model does have AVR too (Automatic Voltage Regulation) But it would appear from what everyone has said along with some other findings about the web that this unit produces square wave! I guess yours is Sine wave hence you not having any problems.
I will probably end up returning this unit and buying an APC SUA1500i. As its been confirmed in this thread and the other thread that was linked to as producing a nice sine wave which is what i want. Again thank you everyone. Pob

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    Ned/The hatter your input here would be most appreciated along with anyone else using a UPS with your mac pro. Please read on...
    Having just concluded a rather detailed any lengthy post over in the power mac g5 forum with regards to loud buzzing noise from the power supply running of battery backup.
    I recemmend reviewing the link below for the full and i think interesting read...
    Linked here: http://discussions.apple.com/thread.jspa?threadID=665537&tstart=0
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    Anyhow it turns out that the RS series from APC also makes the G5 powermac make a noise. And i am aware that Ned along with some others use the APC RS series with there mac pro's. What i am looking to find out is... Do you have a noise from your power supplys when running on battery backup with your new shiney mac pro's?
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    As you can see this has all got very complicated and over my head.
    The reason for me coming into this forum and asking about noisy power supplys when using certain UPS is because shortly i will be switching to a Mac pro. And if the power supplys in these are different and dont make a noise when running under battery with certain APC Rs's and the new Dual form belkin units then i wont return my current belkin model in exchange for a APC smart ups. I will just live it for a short time whilst i own my G5 and just hope it wont do any damage if and when we have a power outage.
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    Pobster,
    Switching power supplies (such as those used in computers) do not require a "pure" analog sine wave input; they are more than capable of running on PWM/stepped sine wave input. The noise from the power supply when running on power from a PWM output UPS does not indicate that damage is being done to your machine; it's a harmless side effect.
    Some equipment will be damaged if powered via PWM input; items with compressors (refrigerators, air conditioners) definitely fall into this category, as well as some medical equipment and telecom equipment.
    I live in an area with notoriously dirty power; a UPS is critical in my case (I'd argue that it is critical in any case, however). I've ran my equipment on UPSs for many years, and the price has dropped significantly. I've got one APC SmartUPS with pure sine wave output which was purchased for me by a client, but most of my equipment is running on UPS with PWM output. It's not uncommon for me to have 20-30 power events in a given day - most of them transient voltage drops or spikes; I've still got an old Sun Sparc 10 file server that's still chugging along.
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    Most manufacturers provide connected equipment insurance - tripp lite, for example, provides $250,000(US) coverage. I've never known anyone who actually needed to use this coverage - I certainly haven't .
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    Pobster,
    Switching power supplies (such as those used in computers) do not require a "pure" analog sine wave input; they are more than capable of running on PWM/stepped sine wave input. The noise from the power supply when running on power from a PWM output UPS does not indicate that damage is being done to your machine; it's a harmless side effect.
    Some equipment will be damaged if powered via PWM input; items with compressors (refrigerators, air conditioners) definitely fall into this category, as well as some medical equipment and telecom equipment.
    I live in an area with notoriously dirty power; a UPS is critical in my case (I'd argue that it is critical in any case, however). I've ran my equipment on UPSs for many years, and the price has dropped significantly. I've got one APC SmartUPS with pure sine wave output which was purchased for me by a client, but most of my equipment is running on UPS with PWM output. It's not uncommon for me to have 20-30 power events in a given day - most of them transient voltage drops or spikes; I've still got an old Sun Sparc 10 file server that's still chugging along.
    A couple of interesting articles for your perusal:
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    http://en.wikipedia.org/wiki/Pulse-width_modulation
    A quick google will turn up lots more information on the topic. APC used to have a white paper on their site which talked about this very topic.
    Most manufacturers provide connected equipment insurance - tripp lite, for example, provides $250,000(US) coverage. I've never known anyone who actually needed to use this coverage - I certainly haven't .
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