VIN under-voltage event (9.5V) Duet2 Wifi

Caveman 0

Thank you both for the quick response!

@Phaedrux Yes, I have been able to measure VIN when the error and warnings occur and the voltage does not drop (stays around 13V). Not sure if it is because the event happens too quick and the meter cannot see the drop, if one is happening.

@dc42 VIN terminal block screws were checked to make sure that they were making good contact and were redone but still having the same warnings.

dc42

@Caveman-0 what VIN voltage does M122 report?

Caveman 0

@dc42 Just powered on the printer and ran M122, current is 14.4.

dc42

@Caveman-0 either something is causing the PSU voltage to drop as reported, or something is causing the 3.3V rail to rise to about 4.5V. The 3.3V rail is used as the reference voltage for measuring VIN, so an increase in the 3.3V rail voltage will cause the reported VIN voltage to drop.

Caveman 0

@dc42 Is there anyway that I can test to see if the 3.3V rail is jumping up 4.5V during the event? Would it be beneficial to make the power supply output exactly 12V with the potentiometer?

I also discovered that I get the same warning message when setting the temperature on the heater.

Caveman 0

@dc42 Was testing some controls within the web browser and it seemed to be acting like it should. Just completed a 1 hour print completely fine. No errors or warnings throughout the print. Even after turning the printer off and back on no errors when heating the extruder or homing the printer.

Would it still be wise to go ahead and get a new power supply?

Could this supply be on the way out which is why the 3.3V rail is unstable or could it be a problem with the board itself?

Phaedrux

What kind of power supply is it?
If the problem happens again, it might not be a bad idea to swap out the supply. If it solves the problem, great, if not, then there may be an issue on the board with the reference voltage.
Fairly cheap and easy to swap for troubleshooting and you have a spare after.

Caveman 0

@Phaedrux The supply in it now seems to be a non-branded supply (KL-350-12) that came with the printer originally. SeeMeCNC now supplies new printers with genuine MEAN WELL power supplies and in my case the LRS-350-12. I've got one on order and will see if that fixes the problem. If not then ill grab another board and continue troubleshooting.

Caveman 0

@Phaedrux Do you have any recommendations for troubleshooting the 3.3V reference voltage on the board to see if it is increasing during the event?

Phaedrux

@Caveman-0 said in VIN under-voltage event (9.5V) Duet2 Wifi:

@Phaedrux Do you have any recommendations for troubleshooting the 3.3V reference voltage on the board to see if it is increasing during the event?

I do not, but @dc42 may.

Caveman 0

@Phaedrux @dc42 I was able to test the voltage regulator output on U2 and it is supplying 3.3V even during the voltage event. I have a new power supply on the way but I am a little skeptical on if a new supply will fix the problem as the output of the supply seems to be fine. Is there any possible troubleshooting that is recommended before moving forward with a new board?

chanyork

@Caveman-0 So would you able to find out is it the power supply or the board? Since I am having issues with Over-voltage and causing board to shut down. And hence wondering if it is the board that I need to replace or the power supply.