Hi everyone, I received the modified power supply from Krissy at Korad just over a week ago. So the first thing to do was to try and blow it up or burn it out to appease the trolls and for the interest of the more curious folks watching the thread. In a nutshell I failed. The thing is still sitting beside me here with its output current-dependent fan going flat out.
What it was subjected to was:
- Set to 31.00V 5.100A and shorted the output. Left running for about 3 hours.
- Output shorted and the output switched on and off rapidly
- tried to use it as an arc-welder to stick the DMM probe to an alligator clip
- ran it at close to 150 Watts for about 5 hours
- rapidily switch the output on/off set to 31V 5.1A and a load connected
- ran it at 1V, 5.1A into a short circuit for 3 hours (this was more interesting from the current measuring DMM perspective...)
In summary, as we say here in Aussie-land the results were "as boring as bat-sh*t." The thing is still working. I have never seen bat-sh*t, but I can endorse the validity of the adjective used in the comparison to a working power supply in steady-state conditions.
I did get that nice smell of warming plastic from the insulation on the alligator clips connected to the load. But nothing more spectacular than that.
I took a few thermal images of it too. Before I get trollisitc comments.. these were taken with the cover on because the cover forms part of the forced air cooling path. Highest temp I could see was about 77 degC on the transformer when it had been running at full load for over 2 hours. I'll upload those thermal images in the next post.
The one in this post is the power supply feeding the 10A input on a DMM. It did this continuously for over 3 hours today and had no problems with being switched on and off rapidly. You can see the area on the DMM where its fuse sits just behind the front panel. You'll see in the video, whenever I get it loaded, that this warming affects the DMM reading. And before anyone comments, the DMM's had auto-powered-down and I'd got bored turning them on over and over again.