UPS beeping continuously
Good day folks. This is going to be a general discussion, since it's a rather particular issue with a rather particular device that not many people are going to have around, but the basics may still apply.
I've got an UPS (called "SPS Pro", whatever) which won't turn on but beeps continuously when you connect its batteries or plug it into the mains. When you apply mains, the display does come on with all the segments illuminated like it's initializing something, but then begins beeping and the display goes out (sometimes, but not always, accompanied by an "overload" indicator). The weirdest thing about this is that I replaced the batteries in it yesterday (takes 2 of them in series for 24v) and it worked perfectly on the bench with nothing plugged it. My colleague then took it to the customer where it was to be installed and on its way there it somehow broke down and when he arrived and tried plugging stuff in, the thing went crazy and he had to come back with it....heavy thing BTW
I'm suspecting bad caps (pun intended) This thing likes to get hot....VERY hot...in fact when I first got it to replace the batteries, it was SO hot inside of it that the transformer inside was impossible to touch, despite having spent around half an hour in transit turned off, from the client's site to our shop, so I can imagine those caps don't like that, especially 24h a day for the past year or so ! The batteries were completely cracked, bulged and leaky...it was a freak show. Still, it appeared to work immediately after replacing the batteries, and I may have a theory: it was still warm when I replaced the batteries, so the faulty cap(s) might have still been semi-functional, you know how you heat them up slightly and that SOMETIMES tricks devices like TVs and main boards and other stuff to turn on ? After a while sitting on the bench, it cooled down, the caps failed for real this time and here we are...I might try heating it up again gently just to see what happens. Batteries are full, at around 25v in series, so no issues there.
Point is: what are some of the common failures in UPSs (upsS...is there such a word ?) that would cause them to behave like this, as if the battery is low or it's being overloaded ? Nothing's blown, of course, at least not visibly. Certainly none of the 8 transistors - I checked those, plus I doubt it would've looked so pristine if one of those went Could it be considered a "software" issue ? Is it really that smart ? I see a micro on there, but that could be for the display for all I know.
I've got an UPS (called "SPS Pro", whatever) which won't turn on but beeps continuously when you connect its batteries or plug it into the mains. When you apply mains, the display does come on with all the segments illuminated like it's initializing something, but then begins beeping and the display goes out (sometimes, but not always, accompanied by an "overload" indicator). The weirdest thing about this is that I replaced the batteries in it yesterday (takes 2 of them in series for 24v) and it worked perfectly on the bench with nothing plugged it. My colleague then took it to the customer where it was to be installed and on its way there it somehow broke down and when he arrived and tried plugging stuff in, the thing went crazy and he had to come back with it....heavy thing BTW
I'm suspecting bad caps (pun intended)
This thing likes to get hot....VERY hot...in fact when I first got it to replace the batteries, it was SO hot inside of it that the transformer inside was impossible to touch, despite having spent around half an hour in transit turned off, from the client's site to our shop, so I can imagine those caps don't like that, especially 24h a day for the past year or so ! The batteries were completely cracked, bulged and leaky...it was a freak show. Still, it appeared to work immediately after replacing the batteries, and I may have a theory: it was still warm when I replaced the batteries, so the faulty cap(s) might have still been semi-functional, you know how you heat them up slightly and that SOMETIMES tricks devices like TVs and main boards and other stuff to turn on ? After a while sitting on the bench, it cooled down, the caps failed for real this time and here we are...I might try heating it up again gently just to see what happens. Batteries are full, at around 25v in series, so no issues there.Point is: what are some of the common failures in UPSs (upsS...is there such a word ?
) that would cause them to behave like this, as if the battery is low or it's being overloaded ? Nothing's blown, of course, at least not visibly. Certainly none of the 8 transistors - I checked those, plus I doubt it would've looked so pristine if one of those went Could it be considered a "software" issue ? Is it really that smart ? I see a micro on there, but that could be for the display for all I know.
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