RRC[

Rat Rig Community [Unofficial]•3y ago

Arthur_C

X & Y Stepper drivers overheating while IDLE (so not yet homed)

I am running a V-Core 3 with RATOS2.0 on M8P with CM4 and 2209 (and EBB36) with latest Klipper and updated system. While yesterday the printer was functional, I powered down and this morning I restarted the printer. Now I noticed a clicking sound which I now believe was the steppers resetting due to overheating. I narrowed it down to the X & Y motor overheating.
Stuff I have seen but can not explain:
-I checked that cables and the appear ok.
-If I disconnect both cables (Left and Right) from the steppers and reboot, the stepper of the left motor immediately overheats (I have a thermistor on the heatsink) and it goes to 80degr C so I switch off the printer.
-I take out the Left motor stepper (as I thought it might be defect). Right Stepper still in the board. When I connect the Right Motor to the Right stepper, The Motor actually Locks (no movement). When disconnecting the motor hire, the full gantry moves as normal.
-I have switched this Right motor stepper to the Left motor bay in the M8P (no motor wires connected) and it too overheats,...

I am a bit puzzled how to continue error finding...

Also, I have a Fan blowing over the M8P as I normally run the Performance settings, with steppers reaching temps in the range of high 30degr C. Above problem remains when I switch to the "Uncooled" setup.
Printer.cfg attached...

Any Pointers in the right direction are appreciated.

printer.cfg20.4KB