Question about APC Conext 900VA (cnb900) UPS System

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No indicator lights after replacing battery

I have a Context 9000 BU. I replaced the battery but now the battery backup part does not seem to work nor do I have any lights. Pressing the on/off button has no effect. I can feel the unit click on when plugged in. It worked perfect until I replaced the battery. I replaced it because it started to beep. I put the old battery in and it does the same thing. The unit is about two years old

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  • Expert
  • 91 Answers

I have one question, have you connect the battery terminal correctly the first time you install your new batteries? If not, it might be your battery fuse is blown during the process :) check your UPS battery fuse.

Posted on Feb 20, 2013

  • German Sarmiento
    German Sarmiento Feb 06, 2015

    I have the same issue as described above with my 2 year+ Conext 900 AVR UPS system. I checked that both, the AC overload breaker and the battery fuses have continuity. New battery and AC power are Ok but system's indicator lights remain off. What should I try next?

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: A smart ups 1400 stopped working

First cheack the supply if supply is present the then cheach the cable which is connected between power supply and the ups if this things are working properly then open the ups and then go to the power supply section by tracing the ip put from the power supply switch you will find the fuse over there

Posted on Dec 18, 2007

SOURCE: low battery alert on my apc - ups es350

Have your supply voltage and frequency checked under load.
/bz

Posted on Mar 11, 2008

gotgeek2
  • 565 Answers

SOURCE: APC Backup UPS Model # BK200C salvageable?

Yes, but the battery may not be any good, though, and trying to charge it may damage the charger. A new battery is about $20. The surge suppressor will still work without the battery as long as it is connected to a properly grounded 3-wire circuit. If you decide to take a chance and charge the old battery, take precautions like keeping a watch on it should it explode or catch fire. Not trying to scare you, just looking at worst case scenario.

Posted on Jan 27, 2009

  • 28 Answers

SOURCE: It's an older unit that i just tried. When i plug

Try installing the software that is included with the unit. If you didn't get the software, I believe you can download it for free from APC's website. The software will typically give you the status of the batteries and let you know if you need to replace them. If you can't get the software, take the batteries out (keep note of the wiring configuration) and test each battery using a DC voltmeter. The batteries should read around 13.5 volts DC. If they are around or below 11.5v DC, it's time for new batteries. This model, if its the black 110v version, requires the RBC32 which can be found at: http://www.batteryinternational.com/apc-rbc32--f2.html

Good luck and I hope I could help.

Posted on Jul 01, 2009

pravinbhavsa
  • 348 Answers

SOURCE: hace a APC XS 900 that said battery needs

disconnect one terminal of the battery then measure charging voltage betwen +ve and -ve it should be 13.8vdc for one 12v battery if charging voltage is not present then battery is ok then connect ammeter to measure the current in Ampere .take care it should be in series if current if no current then battery must ok opern the ups there is a charger transformer measure i/p voltage to transformer if not present then check i/p path if present then check diodes at o/p of charger if faulty replace it also check capacitor and regulator ic if faulty replace it your problem must be solved

Posted on Mar 14, 2010

Testimonial: "There is no way to check the water in the batteries as thry are sealed. I found out that after a load is applied it goes on battery for a few seconds "

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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.

Refer to page (4) of the owner's manual for a description of the UPS' front panel controls and indicators.

Looks like if the 4th LED from the right is on, you need to replace your battery.

Left to Right the LED's are:
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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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