Question about APC Back-UPS CS 500VA UPS System

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My UPS it just beeping ,when i connect it with a computer it doesnt switch on .

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Pres the reset switch and it could possibly be that the battery is incorrectly connected or dead.

Posted on Jun 04, 2009

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After i switch on the ups there are continuous beeps with red light instead of the normal green. if i continue to use the beeping stops after sometime but the red light persists. But then again the beeping...


ups with 300 watts can only back up 1 computer, though it can handle 2 computers but not too long. your ups battery life span are good only for 2 to 3 years. for battery replacement you can visit the nearest service center and ask for battery replacement. it will not cost you much.

Feb 10, 2011 | APC BE500U ES 500 USB BACK-UPS 500VA/300W...

1 Answer

The UPS machine periodical (every 20mins)gives three beeps. The event log in LANSafe shows "UPS Overload".


You may have too many devices connected to the UPS. Try disconnecting some of them. Typically you want your computer and monitor to be connected. You may want to have your internet modem connected also. Printers are a luxury and I would only include them if your UPS can handle it.
Hope this helps, good luck!

Mar 10, 2010 | Powerware 9120 UPS System

2 Answers

My 485VA back up system beeps after I have a few things plugged into it. Does the beeping mean the battery is bad?


Try only the computer and monitor - it may be overloaded, 485VA is around 400W only, so it won't accomodate much more than a standard computer + monitor.
Especially a laser printer is very power consuming and should not be connected to any UPS.

Nov 28, 2009 | CyberPower 485VA UPS Backup (BE485) UPS...

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Any schematics available for a APC Back-UPS Pro 650PNP? I installed a new battery (yes correct polarity) and smelled a little smoke. It was unplugged during the battery swap. I took the cover off but...


hi, i don't have the schematic but, i think if you connected the batteries okay and had switched off the machine then it should work. when switching on there are two sounds that come, first its a beep, if you release the ON SWITCH the UPS will just do a self test then shutdown. to switch ON the UPS completely don't release the on button until you hear a second beep, if you release the ON switch when this beep is on, then the UPS will be ON completely.

Nov 09, 2009 | APC Back-UPS Pro 650 UPS System

1 Answer

My Liebert PSA itON 600 UPS keeps beeping when i turned it on


To figure out what's wrong with the UPS, first you have to do a few things.

When calculating the rating a UPS can handle, it's voltage x amperage. If it's Watts multiply the number by 1.67 to give the rating of the device.

Add up all the devices (use the power supply rating in the computer) as well as any other device, and add them up.

If this rating was exceeded, then you have overloaded the UPS. If it was too long that you did this, then you wore out the battery.

When a UPS beeps even when not connected, that means the battery is very weak.

If the battery is more than 3 years old, it will need to be changed. If the online tests of the unit were done and the battery doesn't need replacing, then other parts of the UPS need fixing.

Check the battery.

Jul 27, 2009 | Liebert PowerSure ProActive PSA700 UPS...

4 Answers

Mge nova avr 1250 problem


ups charged for 8 hrs .No alarms but on powerfail no output to connected device

Nov 15, 2008 | Computers & Internet

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