Sigma 50B power supply issues

[Chris-socal]

Very strange indeed.
Your wiring looks good.
I’m a little confused as to why the 24v rail reads 1v.
I wonder if the line needs a load.
I seem to recall mine needed a load on one of the rails to turn on. Kind of like a PC power supply. That certainly would be a problem although the computer runs on 5v. 12 is probably for bulbs and solenoid if there is one 24v, I believe, is stepper motors. I guess you could connect a meter to one line at a time and see if one craps out.

[Flappa]

Yeah, I am also confused about the 1 showing on the meter for the 24V rail. I thought the 1 that came up on the meter was in a weird spot on the display. I had the meter set to DCV and the 1 is all the way to the left on the meter display, like if I had it set to ohms and without touching the probes to anything it shows a 1 all the way to the left. Then when probes are connected, it reads zeros starting from the right. I will have to check the 5 and 12v rails again and see if those numbers come up on the left or right. Just to see what happened I also tested all 3 rails with meter set to VAC and all came up with numbers a little more than double the volts.

I don't know what you mean by connect the meter to one line at a time and see if it craps out. Can you explain that in detail.

[Chris-socal]

I mean Stick your meter probes in the 5v line and play the game, watch the meter to see if that rail dies when the game shuts off. Then do the same thing for 12v and 24v.
You shouldn’t be reading much AC at all, maybe 1v. That could be meter malfunction if it isn’t a really good meter.
If it really does have that much AC on the line the game might not play.

[Flappa]

Okay, I will have to get creative. I think I have some wires with alligator clamps on the ends that I could clamp on and be able to have the meter outside of the machine while I play It. Won't be able to do that for a few hours from now.

[Sunrise Side]

I agree with Chris. I think one of your voltages, the amps are to low. Or maybe you are getting a voltage drop on one of the three outputs. One of them is on the edge and that why it is a random issue.

[Flappa]

OK first off, I have not been formally taught anything in the electrics field. I have dabbled with it and have wired up a handful of things including outlets in my welding shop. I know what ohms, DCV, ACV, and DCA are on the meter, but each of those have different values to set the meter to and I have no idea what it should be set at.So when I checked voltages with the meter last time I had it set on 20, DCV. My first pic for this post is showing meter set to 20, DCV and the 1 on the far left of the meter display when testing 24 V rail. BUT when I set the meter on 200, DCV
 the 5 V and 12 V rails both
 were 5v and 12v respectively and did not change when it crapped out. The 24 V rail also showed 24 V, but when machine crapped out went up to 27.6v. So there was actually no voltage drop at any anytime, and actually gained a couple volts on the 24 V Rail when failure happens.

When I set the meter to 200, ACV, the 5v rail was 10.4v, the 12v rail was 27.0v, and the 24v rail was 51.9v.

Later I will do what sunrise side suggests and check the rails for direct current amps and see what I get.

Thanks for all the input and help so far.

[Flappa]

Pics

[Flappa]

Pics

[Chris-socal]

Flappa
I am pretty sure this is the same PS:
https://www.ebay.com/itm/196307648488?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=TGVQoC5DRW-&sssrc=2047675&ssuid=emm0sFORS4-&widget_ver=artemis&media=COPY

You can bench test the PS too.  https://youtu.be/Xu2-fTX1xt0?si=tRQMaprKimmYLnhu


I suppose its possible we are chasing the wrong issue but if the machine sits idle ready to play and never shuts down I don’t think its the MPU.

Chris



Chris

[Chris-socal]

Our messages overlapped. Set the meter for the voltage range that is higher than you expect to see.
You can’t measure the 24v rail using the 20v setting. Go to the next step up, probably 200v as you said. All readings on the output pins are DC.
I don’t understand those results, they make no sense whatsoever. If those readings are accurate your PS is shot. Which I don’t think is true.
I think you need to move up in digital voltmeter quality.
If you watch my boring 8 minute video I test all 3 rails and show voltage reading on each.

Chris

[Flappa]

Thanks for explaining how to use the meter properly. I think I have an idea of what is going on with my power supply and why the issues are hard to understand. I figured there would be some instructions with the new power supply, but there were none. So I just wired it up. Put it in the machine and turned the machine on It didn't work. I think I went online looking for information and saw that there was a switch inside to change the input from 120 V.AC to 240 VAC. Sure enough. It was set at 240 VAC so I switched it to 120 VAC put it back in and it worked. Over the next few days, I started noticing these issues I mentioned. So
hopefully, I only messed up the PS instead of anything on the machine. I will order up another ps and check that switch before. I hook it up this time. I will
 let you know how it goes. Thanks again for all the assistance.

[Chris-socal]

That switch probably doubles the rectifier diodes and maybe overloaded that line.
Keep us posted and good luck.

[Flappa]

Machine is back up and running as it should without issue, but the fix was not what was suspected. I did get another Mean Well power supply and I flipped the little red switch from 230V to 115 V before hooking it up this time. Hook it up and played for a little while and then the power down issue came back. So I started unplugging things one at a time and seeing if there was any change and when I unplugged the wire connector to whatever is just under the CC (center of pic) the problem went away. I connected it back and the problem is still gone, so I think it might have not been plugged in all the way and causing issues? Second pic is showing the little red switch on PS to change input voltage.

[Chris-socal]

Glad you found the problem.
I think the process of disconnecting one device at a time in each line is covered in the manual, now we understand why. They wanted to isolate which device or line  is causing the lockup or shut down. They also knew that by disconnecting the troubled device would allow the machine to continue.

Chris