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Back-UPS Pro 550 not charging battery when powered on

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

Solved
aislinn_apc
Crewman
Crewman
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9
3183

Back-UPS Pro 550 not charging battery when powered on

This was originally posted on APC forums on 11/19/2020


Hi!

I have a Back-UPS Pro 550. After replacing the battery, I realised that my unit was not charging the battery anymore when powered ON. Tests I have conducted so far:

  1. If the unit is powered ON, the battery does not charge
  2. When powered ON and I disconnect the battery I can measure 13.78V on the battery poles, so Voltage is there from the DC converter
  3. When I shut down the UPS, then the battery starts charging: I see the voltage slowly increasing and after 2 days the battery was 100% charged

Based on the above it seems to indicate that charging circuit is OK, but it might be a SW issue or some failing sensor that cuts battery charging ? Is there any reset function or FW update that I could apply ? Anything else I could check / do to fix it ?

The unit is around 5 years old so not covered by warranty but still not that old 🙂

Thanks

Tags (4)

Accepted Solutions
aislinn_apc
Crewman
Crewman

Re: Back-UPS Pro 550 not charging battery when powered on

This was originally posted on APC forums on 1/6/2021


On 11/19/2020 12:19 PM, Bill said:

You can try and brain dead the UPS to reset it.

Hi, thanks for the replies. I did try a brain dead reset + another type of reset I find on the internet, no success.

After opening the device I located a bad capacitor (see picture).

After replacing it, the charging process of the Battery is working again!

Thanks for the quick answers and the help.

See Answer In Context

Attachments
9 Replies 9
BillP
Administrator Administrator
Administrator
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0
3180

Re: Back-UPS Pro 550 not charging battery when powered on

This reply was originally posted by Bill on APC forums on 11/19/2020


Hi,

You can try and brain dead the UPS to reset it.

See Schneider Electric FAQ FA158947 for instruction. 

BillP
Administrator Administrator
Administrator
0 Likes
0
3180

Re: Back-UPS Pro 550 not charging battery when powered on

This reply was originally posted by Scott on APC forums on 11/20/2020


the basic troubleshooting steps for the APC Back-UPS Pro with ... The Back-UPS is not connected to AC power, there is no AC power ... The battery will not charge if the temperature is over 50 degrees Celsius 

aislinn_apc
Crewman
Crewman

Re: Back-UPS Pro 550 not charging battery when powered on

This was originally posted on APC forums on 1/6/2021


On 11/19/2020 12:19 PM, Bill said:

You can try and brain dead the UPS to reset it.

Hi, thanks for the replies. I did try a brain dead reset + another type of reset I find on the internet, no success.

After opening the device I located a bad capacitor (see picture).

After replacing it, the charging process of the Battery is working again!

Thanks for the quick answers and the help.

Attachments
GeneralTweety_apc
Cadet
0 Likes
0
3180

Re: Back-UPS Pro 550 not charging battery when powered on

This was originally posted on APC forums on 1/13/2021


I have the same problem with this model.

APC wont do anything. It seems to be a problem with this model.

I will give a try to search for the capacitor. Thx for the input.

Sandrus
Cadet
0 Likes
1
2118

Re: Back-UPS Pro 550 not charging battery when powered on

Hi. I have the same problem with the same model. Which capacitor have you replaced?

Tags (1)
Keyro
Cadet
0 Likes
0
2068

Re: Back-UPS Pro 550 not charging battery when powered on

Hi, 
I´m also facing the same problem. After opening the device I found the same capacitor being dead as in the picture. You can recognize a dead capacitor by its curved top. In my device its labeled as the capacitor C18. You´ll need a 330uF 35V ELKO for that.

Tags (1)
Venko
Crewman
Crewman
0 Likes
0
1917

Re: Back-UPS Pro 550 not charging battery when powered on

Hi ,

it also help me , but change two capacitors not only one

Tags (1)
theone
Crewman
Crewman
0 Likes
1
1728

Re: Back-UPS Pro 550 not charging battery when powered on

I have a similar problem:

https://community.exchange.se.com/t5/APC-UPS-for-Home-and-Office-Forum/Battery-charge-dropping-while...

 

Battery charging only during OFF and when ON battery is draining slowly even through connected to AC Mains input.

 

Got it open and capacitors seem fine

 

Any other suggestion?

 

IMG_20220228_141448.jpgIMG_20220228_141454.jpgIMG_20220228_141442.jpg

 

Tags (1)
Venko
Crewman
Crewman
0 Likes
0
1714

Re: Back-UPS Pro 550 not charging battery when powered on

Hi ,

one capacitor in my ups looking fine but is only 270 uF and not working properly. After that i change it with new one 330 uF ups is working fine , only one capacitor is looking damaged  but i changed two of us.

Tags (1)