What conditions cause "Phase A may be disconnected" error
-
I ran a 14 hour print on the weekend.
When I looked in on it towards the end I noticed that from about hour 6 I had started to get error messages on driver 2 saying that either phase A may be disconnected, phase B may be disconnected and occasionally that both may be disconnected.
These errors were sometimes 5-10 minutes apart and sometimes an hour or more between.
Driver 2 is the extruder.
The print turned out perfect so there's no indication that any steps were lost.
I'm fairly sure it'll be a hardware issue, but the fact that the phase in question changes leads me to ask what conditions cause this error.
If it's a bad crimp I'd expect it to always be one phase. Corrosion or a loose plug may affect both I suppose.
Could the stepper be on the way out?
I run an E3D pancake stepper on a titan aqua. These seem to require more than the normal 60-80% of rated current for reliable extrusion at higher speeds.
I have run it at full rated current for over a year because being liquid cooled, the motor remains cold to touch at all times.
It was cold when I saw these errors too.
So short of changing cables and running a long print again does anyone have any technical expertise in the area? -
if you ran the printer for a year , probable cause might be breakage inside the extruder motor wires due to repetitive flex of the wires .
i think its best to change the cables , they're cheap. -
To quote DC42
"at what movement speeds do the "phase may be disconnected" warnings happen? Bogus warnings most commonly occur when the movement speed is quite high and the back EMF from the motors at that speed is greater than the power supply voltage. So if the warnings have only started recently, check that the power supply voltage is good and that the VIN connections to the Duet are sound.
If you only see warnings from one phase and it is always the same phase, then most likely the warning is genuine and you have a bad connection to that phase."
