Question about APC BE500U ES 500 USB BACK-UPS 500VA/300W 120V (NEWITEM13161417) UPS System

1 Answer

APC ES750 buzzer

Its buzzing. Battery was plugged in correctly. Disconnected it and reconnected it. Still buzzes and flashes red battery light.

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  • Expert
  • 411 Answers

Need new batteries probably as batteries may have developed high internal resistance.
Test the batteries one at a time whether they would light up a car headlamp bulb.

Posted on Aug 20, 2014

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Posted on Jan 02, 2017

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viaujoc
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SOURCE: desk top APC UPS ES750 not communicating

Here is an answer I got from APC when one of my client got the same problem as you did:

The error message would pop up if the link between the computer and the UPS is weak. I cannot rule out a problem with the cable or the UPS. In order to confirm the same please try the following steps which might help :

1) Ensure that the USB cable is properly connected to the USB port of the computer.

2) If the PC was powered on before the UPS, communication will not be achieved until you disconnect and reconnect the USB cable to the host. In this case, you need to disconnect and reconnect the USB cable to establish communication.

3) Some other software is polling your USB port for another device, thus causing the UPS software to temporarily lose communication with your UPS. If this is the case, you would need to shut down that application.

4) If you have any other USB devices connected to the PC, disconnect them and then try plugging in the cable.

If the issue persists, please visit the following link which lists few troubleshooting steps :

http://nam-en.apc.com/cgi-bin/nam_en.cfg/php/enduser/std_adp.php?p_sid=oXhRFGEh&p_lva=&p_faqid=2923

Posted on Jan 13, 2008

  • 8 Answers

SOURCE: apc ups flashes red light to replace battery, but battery is new

i think by replacing the battery has not been the solution to the problem

u need to check the battery charging voltage when turned ON with main electricity, if no voltage present from charger, there is no question of battery getting charged and also once the battery is down with charge it may not re charge hence the indicator and alarm.
recomended to nearest service centre

Posted on Sep 13, 2008

  • 28 Answers

SOURCE: green light flashes with a constant buzzing sound

It sounds like you need a new battery. If the APC is more than 3 years old, that is likely the problem. You can get a new battery from http://www.batteryinternational.com/apc-backups-es-be500u-ups-battery-ups-batteries-f2.html

Posted on Jun 23, 2009

  • 25 Answers

SOURCE: APC BR800 Overload light with beeps

Your main control board is defective, you need a new unit.

Posted on Jul 11, 2009

  • 355 Answers

SOURCE: All battery charge lights flash simultaneously.

THIS seems the be the answer to your question. Hope this helps

Posted on Apr 29, 2010

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Sounds like the battery won't pass a battery test, but if it does your explaining dirty battery cable connections clean and or replace as needed as this is the number one reason for a no start . This corrected and known good battery and it still acts up follow the negitive cabe from the battery and disconnect it and clean and reconnect it everywhere it goes. Don't look at it do it. It can look good and be bad. Still bad? the positive cable right at the battery is the root of all evil and you may want too fix it first as soon as the neg cable is removed. Follow the wire and clean everything.

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My 500-A Ups is making Buzzing sound.


APC 500VA ups meant for 1 Desktop and one montiro it will have battery backup for 10 to 15 minutes for the above.

Normally, You should make the raw power connected to UPS should be always ON.

The power cables of CPU and Monitor is connected with UPS. When not in use, please press the Button available on the UPS.

The UPS Life is normally 2 to 3 Years only. Now you are getting the sound and Red Light will always blink and not allow to use the system.

Better replace the 12 Vols battery to get some more life for the UPS.

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Desk top APC UPS ES750 not communicating


Here is an answer I got from APC when one of my client got the same problem as you did:

The error message would pop up if the link between the computer and the UPS is weak. I cannot rule out a problem with the cable or the UPS. In order to confirm the same please try the following steps which might help :

1) Ensure that the USB cable is properly connected to the USB port of the computer.

2) If the PC was powered on before the UPS, communication will not be achieved until you disconnect and reconnect the USB cable to the host. In this case, you need to disconnect and reconnect the USB cable to establish communication.

3) Some other software is polling your USB port for another device, thus causing the UPS software to temporarily lose communication with your UPS. If this is the case, you would need to shut down that application.

4) If you have any other USB devices connected to the PC, disconnect them and then try plugging in the cable.

If the issue persists, please visit the following link which lists few troubleshooting steps :

http://nam-en.apc.com/cgi-bin/nam_en.cfg/php/enduser/std_adp.php?p_sid=oXhRFGEh&p_lva=&p_faqid=2923

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Try going to the properties of the driver and select do not check or check every X mintues.

Try this thanks J

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