Sudden consistent under-voltage events

sac · 12 Jul 2019, 00:05

I'd been getting amazing prints out of my Artemis, until the past week. All of a sudden, every print over 1 hour long is spoiled by repeated under-voltage events. Troubleshooting steps I've tried so far:
Disconnecting the panelDue with no improvement,
Slowing down the print with no improvement.
Turning off the fans with no improvement.
Tried same print with 3 different slicers (Cura, Simplify3d and Kisslicer)

I also have my printer plugged into a UPS and there isn't anything else connected to that wall outlet.
By spoilt, the most common effect is the prints shift and starvation

The log reads line after line of VIN under-voltage event anywhere from 9.7-10.0v

When I reset the printer the log reads: Supply voltage: min 10.9, current 11.0, max 11.1

I haven't been able to download the log while printing, because of losing network access

anyone have any ideas?

JamesM · 12 Jul 2019, 00:10

The first thing I would have tested would have been the power supply.

siblues · 12 Jul 2019, 01:09

I had the same issue it was the wiring going into the Duet it seemed like it was tight but the actual plastic on the terminal was interfering with the connection.

sacsac · 12 Jul 2019, 01:38

I'll check both.

thanks

STEAM · 12 Jul 2019, 02:42

If the power supply can be switched from 110V to 220V, then it will behave this way, especially when the bed heater is on. If for some reason the power supply fails, it will behave this way, as well.

Any bad contacts in the bed power circuit? Are the bed power supply wires connected with ferrules?

More details needed.

A Former User · 12 Jul 2019, 05:23

Measure voltage at PSU and at Duet Vin to see if there is a difference that would suggest bad wiring leading to excessive voltage drop. 10.9 to 11.1v for a 12v supply when idle is a bit on the low side i would think

dc42 · 12 Jul 2019, 07:48

The first thing to check is that the screws in the VIN terminal block are still tight.

coreZair · 12 Jul 2019, 09:19

@bearer said in Sudden consistent under-voltage events:

Measure voltage at PSU and at Duet Vin to see if there is a difference that would suggest bad wiring leading to excessive voltage drop. 10.9 to 11.1v for a 12v supply when idle is a bit on the low side i would think

Good idea.
Most power supplies with metal frame and terminals got a little potentiometer close to the terminals. You can adjust your output voltage to the nominal 12V by turning that potentiometer. You only got around 11V which is a bit low.