🔴 24V Power Supply Repair & Load Testing - DRA240-24A - No.1275
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- Опубликовано: 15 сен 2024
- 24V Power Supply Repair & Load Testing
I repair a DRA240-24A DIN rail power supply, which turned out to be a simple fix, so I also load tested it to check its abilty to output as per its specification.
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Very rarely just the fuse. Maybe a mains surge went through. Nice one!
I just really like that Siglent SDL1020X-E.
Sadly, I don't do any repair work, other than my own stuff, to justify buying one.
I have other Siglent stuff in my lab and I just love the equipment. Never an issue.
Resisting the urge to buy shiny toys 😅
@@AnnaVannieuwenhuyse
😅😂🤣
You're not wrong. LOL
Nice easy fix
🤔If your eyes are covered how can you see where a possible flash is! The answer is safety glasses! And never ignore the diagnostic help of a cautious sniff at the board before you power something up. Finally, remember that although fuses are generally well made, NONE have ever been individually tested at their rated current for their ultimate purpose. 😄 Fuse production test is ALL down to statistics. But you know all this already!
I was relying on the people watching the live stream to tell me... plus I was recording this video so I could have always played it back.
Quite a surprise that the fuse blew! This is usually the kind of supply to have an internal Over Current Protection. It might've been shorted to earth ground, which could screw with the current feedback.
Yeah it was an odd one, I was expecting more of a challenge.
Yes, it was a bad fuse and please don't call me Shirley 😂
Does the multimeter go up to high frequencies so that high frequency SMPS ripple can be measured?
Complete guesswork on my part, I wonder whether this supply was in parallel with another (switched to parallel) and one of the supplies failed, resulting in excessive load. Current protection should have saved it, would be an interesting test.
In this instance it was the sole supply so the reason for failure is a mystery, it was replaced with another unit and no other faults were present.
4:04 wait. Fuse blown and not checking for shorts on the main or secondary side before plugin it in?
Fuses are < $1, for the time to disassemble and check stuff it's worth a shot.
@@JonnyFix you don’t have to disassembly anything. Just check for shorted mains power on the input to ground or 24v to ground on the output.
Sometimes the manner of a second fuse blowing (sound, flash etc) can give you more information about the location or nature of the fault. Simply replacing it can be a diagnostic tool and is unlikely to do more damage.
I did check for shorts after replacing the fuse and before powering up, I just didn’t record video showing it.
Without the fuse intact it would have shown as open circuit until replacing the fuse, either way it had to be opened up, so that aspect didn’t matter.
Hi, are you interested in recycling DC power supplies at low prices? I have a lot of DC power supplies with damaged packaging but no place to dispose of them.
It could have been an output overload that popped the fuse.
@@Chris_Grossman that was my initial thought, but when loaded up to it’s rated current it was only drawing 1.5A, it had a 6.3A fuse, so to blow that in any reasonable time it would have needed approx a 8-10x overload.
I’m surprised the fuse rating was 4x more than its maximum current.
@@TheDefpom What happens if the output is shorted?
@@Chris_Grossman I don't know, I don't want to find out, my safety squints might not be enough.
@@TheDefpom I think an output short is likely story for how the fuse blew.
That issue with the siglent load tester would really annoy me. Who the hell tests a power supply in 1mA steps. No one. Thats ridiculous. Its just lazy code. No attention to detail. It would be easy to fix. Just one line of code to move the focus.