Comment on UPS problem... Again
foremanguy92_@lemmy.ml 3 days agoThat does sound like some part of the controller electronics has been dieing for a while, and has now finally keeled over.
Will try to check the transistor and else
You wrote originally, that you tested what you could with desoldering anything. Measuring resistance in circuit always renders a murky result.
Okay didn’t really known that, not so good in electricity sadly… :(
The brown wire is likely what is known as phase or live. Blue will be neutral. But measuring resistance on the input only tells you how much current will flow in the present state of relays. What could help you come closer to an answer is following the first law of troubleshooting “thou shalt check voltages”. With a device that operates two live rails this will not be both easy and safe at the same time, so don’t rush it. I suggest you figure out what voltages to measure, then solder wires to the relevant nodes. Terminate the wires in a terminal block, where you’re protected from touching the screw. Assemble the device as best you can with all the wires coming out, and then power it on, get your voltages and deduce from that.
Didn’t really understand, can you explain it a bit more? Sorry 😅 About your warning is it dangerous to measure a 230V current with my multimeter (with precautions, gloves mainly)
My initial working theory would be that the transistor switching the fan is dead and I would be looking closely in that area. If that transistor has failed closed and is shorting the controller electronics VCC rail, that would explain a lot. Maybe I’d go so far as to test it without checking voltages (gasp!)
Going to check that, but what are the VCC rails?
About the batteries, I didn’t think they are fully charged with their 12.6V, and I should try to make them go around 12.8-12.9V, but is it possible that because they have gone to 5V they wouldn’t have enough “punch” now and wouldn’t be able to work properly?
BigDanishGuy@sh.itjust.works 3 days ago
Depending on the meter and your approach it can be either safe or lethal. The more I think about it, the more I’d recommend that you just don’t do it at all. Working on 240V installations under voltage, that is something we teach electricians to do safely. Besides the training it involves some special and rather pricey equipment.
I cannot stress this enough, if you mess up, you will hurt yourself with enough severity that the can easily be fatal. If you don’t know what you’re doing, messing up will be exponentially more likely.
Desolder the transistor, does the rest of the board light up? If so replace the transistor. Otherwise, get trained assistance on person or replace the UPS. I’m all for learning electronics, but not on a live UPS.
foremanguy92_@lemmy.ml 3 days ago
Thx for the advice, gonna check the transistor
And I think that my meter is capable of 240V but gonna inspect it with help of electricity guy
BigDanishGuy@sh.itjust.works 3 days ago
It’s not a matter of whether your meter can do 240V, can you do 240V? Because that can be the consequence of slipping with the probe.
Sorry, I don’t mean to come off all aggressive. I just want to make sure that you don’t hurt yourself because I wasn’t very clear in my communication.
foremanguy92_@lemmy.ml 3 days ago
Ohh okay don’t worry for being too “aggressive”
Thank you for saying out the risks for people like me who doesn’t know that much in electricity
And thank you for your answers