APC UPS Rs1000 not charging batteries when plugged in on the wall
I found an old APC RS1000 UPS with dead batteries on my storage which I decided to bring back to life so I opened it to replace the dead batteries with fresh new ones.
Problem seems to be when I plug it to the wall, click the ON button for 2 secs, the green light blinks, then the solid ON BATTERY stays forever.
So it runs only from batteries. Not from the wall.
Thinking the circuit breaker may be burned or just malfunctioning, is this something I can just replace? I tried to search using common keywords with and without the brand with no luck.
Any tips will be welcome.
NOTE: All these tests performed WITHOUT any device plugged to the UPS!
Mise à jour (02/02/2023)
And finally I'm attaching these hi res pics of MY OWN UPS main board just in case you spot anything I may be missing. To me everything looks OK and in good shape, AFAIK this ups was fully working before getting stored and the only issue was dead batteries but.... You tell me??
Well let's see, first things first, ive read over the Net that these prongs do pop-up a lot but I don't have any reference so I don't know if the below is a standard or an activated circuit breaker....
Next thing I've done is check continuity in these 2 poles, and the multimeter beeped, so I guess it's OK and working, in the locked position "as it is" now?
Then I've checked for 220V (I'm in EU) on the upper right corner connectors and they do read 220V so I'm assuming the fuse is working and protecting the circuit so far (aka not "fused").
Am I right till here?
So, considering the AC reaches the main board past the circuit breaker, I'm at a loss now since I'm not an electronics pro to read the service circuits mapping...
Googling a bit further i found this article:
Which for the Rs1000 mentions the change of 3 capacitors.
So my next question is:
Is there a safe way to test if these capacitors are in working order and if there is (multimeter?) how do I perform the check?
Excuse my ignorance once more!
(apparently this is the image of the Rs1000 main board if you feel you need to point me anything out :))
I'll thank any further input on troubleshooting this. Thanks!
Some more tests, each one gets me more confused!
WITHOUT the unit plugged to the wall, setting the multimeter to CONTINUITY, instead of BEEPs from the Multimeter, I get these values on its screen:
The one in the middle produces NO reading and NO beep on the multimeter :?
Then setting the multimeter to DC, I get the following:
THEN, PLUGIN the unit on the wall and turning on the UPS, I get this:
So is it normal that plugged on the wall, with the unit turned OFF I'm getting voltage in the battery connectors? And if so, it means batteries do charge. And if so, what else is not acting so the AC does not kick in while there's wall power??
alextc, I’ll just start by saying: It’s much better to update your original question with new information and pictures, and not flooding the question with answers, that aren’t answers, but updates from OP.
Capacitors can be a contributing factor (electrolytic caps). The only way to test them, is to use an ESR (Equivalent Series Resistance) meter. Those can be found on Amazon for ~$20 + shipping. If you have a decent multimeter, you can test the capacitance, but that will unfortunately not tell you much. You should do a thorough visual inspection of the caps for: leaking, bulging / blown tops and general damage. I don’t see anything that jumps out on the pictures, off hand.
When working on electronics, having an ESR meter is invaluable!
Geir Ove Andersen さんによる
Thanks for the tips! I rarely use/repair this type of equipment to this level but I'm a bit !#^&@@ as I do remember this unit working fine but only batteries were dead on storage :( Seems I was wrong.
I can't find anything bulging or blown from visual so... I'm pretty much f*cked up at this point I guess....
Unless anyone from Europe can take a look to the board itself if I ship it?
2 of the capacitors mentioned, C40 & C41, are in the charge pump which generates -8V for IC8 which is the line sense op amp. If -8v isn't there, there is no line sensing and it will only run on battery. Are you getting any beeps? - that is what drives the charge pump. If there are no beeps then it is in IC7 circuit. If there are beeps, it is in the charge pump. Likely C41 - the black cap. If you can run it opened up and are comfortable with that, measure the -8V on the - side of C41. If there is -8V, then it is in the line sense IC8 circuit.
@ruggb When I first turned it on after battery replacement, there were no beeps, as batteries kicked in.
On a couple further switch on's, now it starts to beep, but my guess it's related to the batteries being almost discharged (as they were not charged in first instance upon recieving them from the store).
So aside from the "batteries drain" beeps, I'd say there's nothing wrong with the system (aside of it not running from AC of course).
So I should get -8V on the C41 legs you say?
@alextc yes, without that -8V the AC sense circuit doesn't work. Since you have beeps, the charge pump should be driven.
So, you are also saying the charging circuit is working, right?