Warranty replacement fried?
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@siblues said in Warranty replacement fried?:
Do you think there could be a problem with the actual terminal block?
I have a few ideas, assuming the cable is properly inserted into the terminal and attached to the PSU. This is one - if possible, check the soldering on the underside of the board, and make sure it isn't cracked or lifted.
Another is a possible short. From what you've posted, I think you've measured the voltage at the PSU while it's connected to the board, and the board is powered up. However, if your 13.4V PSU measurement was taken while the board is off or disconnected, but the board shows 1.9V once it's powered on, recheck the PSU in that state. If it is now showing 1.9V, that implies a short on the board or in the cabling, and the PSU is dropping into a fault condition to protect itself. Cycling the AC power or disconnecting the load should reset it.
One more thought - is the power cable direct from the PSU to the Duet, or is there a switch between the two? (It may seem odd to switch the 12V, but there could be valid reasons.) If there's a switch, bypass it.
As @crynool suggested, check the resistance of the power cabling itself. It, or a crimped-on terminal/ferrule, may be damaged.
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@siblues said in Warranty replacement fried?:
Do you think there could be a problem with the actual terminal block?
Where are you measuring the VIN voltage on your Duet with the multimeter? I normally touch the multimeter probes on the tops of the screws in the terminal block. That way I know that I am measuring the voltage that is reaching the Duet terminal block.
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I am checking on the screws.i checked the PSU both connected and disconnected from the Duet and it reads 13.4 both ways.I don't have a switch between the Duet and PSU and the cables are a continuous piece of 10awg cable with the crimp connectors on both ends.I will check the resistance now and get back to you I will also check the solder joints on the terminal block.I don't think it is a wire issue because it was working fine and it wasn't moved at all and when the bed started to heat the Duet turned off and we have the current problem which kind of seems like a failure of some sort.
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I totally removed the board and psu from the printer and used a new set of power wires and made sure they were installed into the block correctly and it still doesn't power on.I also checked the terminal block connections to the board and continuity from the screw to the soldered pins on the board are fine.I looked at the board and nothing that I can see shows any physical damage.I also checked the VSSA fuse and it is giving me a reading of .9-1.0 ohm.Anything else I can check?
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Start with removing all cables/wires, just let the ones connected which you need to control the Duet (if it is Wifi, even better) & power.
Just to make sure no other wire is creating a short (which isn't enough to blow a fuse but to have the PSU running in some sort of failsafe).
What is the Amperage on that line when the Voltage is dropping?
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That is what I just did the only wires connected to the Duet Wifi were vin and ground and it was reading less than 2v and the psu was supplying 13.4v.
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Tried swapping the PSU? Sounds odd ... but apart from the Duet, this is the only piece which you didn't replace yet?
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I ended up spending quite a bit more than I wanted to and a better PSU is on my list but I don't just want to throw money at the problem.i purchased the best when it came to the controller to try to avoid that in the first place.
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I mean, at least you can try ... sort of cheap ATX PSU just for troubleshooting.
Shorten PS_ON & GND, have an old HD Power connector connecting to VIN
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I don't have one laying around but I can order a new Meanwell and try it .I am going to try the PSU I have on my Smoothieboard and if it works I highly doubt it's the PSU.
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Set your multimeter to 10A scale and connect it in series with the Duet. If there is a short, it should jump (above 10A most likely). If the PSU is at fault you will see much less current than 10A.
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Crynool to my disbelief it was the PSU.You my friend hit the nail on the head.I swapped out my psu for a friends and it is working just fine so I am going to order one today.Thanks for all the help
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Glad you sorted it out
