General > General Technical Chat
Triplight UPS Issue
larrybl:
I was given a 1440W Triplight UPS. Battery was dead so I ordered a new one and installed. Everything was working fine, then we had some T-Storms coming in so I put my computer on it and was good for about 6 hours then it just shut off (Main power never went off). I put the computer back on the power strip, and moved the UPS to the bench. I ran it with no-load and it shut off after about 16 hours. I then plugged a shop light in and the UPS shut off again after about 16 hours. I performed the self tests described in the manual and it performed as described.
I am not against tearing into this as I only have $19.99 tied up with the new battery. Inverter works, Switching from mains to battery and back again works. I am guessing an issue with the power on circuit. Could not find a diagram, so this could prove to be difficult with my skill level.
Suggestions?
james_s:
You mean it's shutting off while it's still plugged into the wall? Usually the only thing wrong with old UPS's is the batteries go dead, but even with a dead battery they should keep supplying the load while plugged in. I would check the electrolytic capacitors, especially if it has any of the surface mount type, those are notorious for failing. You might have a bad capacitor in the power supply that powers the logic.
larrybl:
Yes, it just shuts off while plugged in. I powered it back up yesterday, and this morning it is still working. Seems the up-time is getting longer after each un-intended shut down.
tom66:
Cold solder joints would be worth looking at too.
jmelson:
--- Quote from: larrybl on April 20, 2021, 12:02:25 pm ---Yes, it just shuts off while plugged in. I powered it back up yesterday, and this morning it is still working. Seems the up-time is getting longer after each un-intended shut down.
--- End quote ---
Ohhh, that sounds like a symptom of deteriorated electrolytic caps!
Jon
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