Back-UPS ES 750 just lets a out a loud constant tone

[Anonymous user]

Actually it could be my PSU Not sure..


This thing is right out the box from best buy. Not sure if its refurbished. Looks as if it was retaped and there was a reciept on it with bunch of test-pass on it. Im not sure if APC does that for all of them or not. I paid retail. But all I have pluged in right now is comp, monitor and dinky speakers. Just got done building a comp. I have a 520w PSU, is that too much? This is my first UPS, I don't know much about these things. But thought I read here that the watts doesn't need to be above PSU. Just got done with my build. Could it be with my computer? Im no engineer.

Oh tone starts when I power on my comp.

Considering its 750VA /450w I found this on wiki http://en.wikipedia.org/wiki/Uninterruptible_power_supply :

"Besides choosing a UPS design, there are 2 key ratings to be aware of when choosing a UPS unit. The first is the load rating, expressed as both volt amps (VA) and watts (W). Both the ratings represent the maximum amount of load that the UPS can support and the connected load typically should not exceed 80% of either. Special considerations must be made when connecting certain equipment such as printers or any type of motorized load due to their higher starting currents."

Does it mean I need I need something above 650w just for my comp?

Message was edited by: digital zephyr

Message was edited by: digital zephyr

[TheNotoriousKMP_apc · Accepted solution]

Hello,

All signs point to an overload. If you're 520W PSU reaches full capacity upon startup, you're exceeding the capacity designed on the UPS. That would cause the constant tone. I would recommend getting a larger unit for your CPU, and possibly use this unit for home networking equipment.