Question about Compaq 500 UPS Pro ( 300W / 120V / NA ) (155373001) UPS System

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Compaq Pro UPS 500 UPS System - light on far left indicator is blinking and there is a constant clicking noise (that is driving me crazy!!!) I would guess there is a battery in the unit that needs replacement, but seek confirmation or other ideas, thanks!

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  • 64 Answers

Maybe the battery, but I think you have a serious over and under voltage issue that causing the AVR to click on and off again.

May I suggest a PMM117 power guard as a tool to monitor the power. If the voltage drops, current rises, it switchs of the power....once. Not like on and off/ on and off/ you loose 50 watts everytime that happens.

Otherwise a $30.00 battery plus shipping I can help you with.
727-823-6100

Posted on Sep 08, 2009

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Vote for this solution if it helps.

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Hello kingfisher1

You can find the owner's manual for the Minuteman Pro 520 UPS HERE.

You can find support for Minuteman UPS' HERE.

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Please, let us know if you have any more questions, observations, comments, etc. on this topic. We are happy to help.

Thank you
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