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 steppers 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...
7 Replies
Arthur_C
Arthur_C2y ago
Things I have done already: - Moved the Right- and Left steppers drivers and motors to M4 and M5 on the Manta Board. Problem not resolved - Exchanged the whole Manta M8P with a spare unit (swaped the CM4 to the spare unit as well). Problem not resolved - Put in 2 new Stepper drivers. Problem seemed resolved, however after full power down and reboot. Right Motor freezes on power up. Machine Home's X & Y but when I power down the motors (M84) the Right motor keeps humming and freezes up. Problem changed but not resolved. Posted above thread yesterday in #ratos-support https://discord.com/channels/582187371529764864/1090919979743985775 and @miklschmidt believes it is not a RATOS issue but a hardware issue. I am pretty much at a loss where to go from here... Any Pointers in the right direction are appreciated..
blacksmithforlife
@bttuniversity can you help Arthur above?
harsh-harlequin
harsh-harlequin2y ago
I noted that your run current for both of your steppers is 1.6A. That is a lot. I have not worked with RR machines at all but I looked at the stock configs and they max out at 1.1A which seems more reasonable.. tagging
Arthur_C
Arthur_C2y ago
Thanks for joining my problem-finding quest! 1.6 is th "Performance" settings offered by RATOS on the supplied 2209 steppers...Other power users (such as @miklschmidt are also running it... Do you think this could cause damage, and if so, what makes my setup differ from Mikl's setup? Could you elaborate a bit? you comment is unclear for me.
miklschmidt
miklschmidt2y ago
yeah we all run our 2504AC's at 1.6 (that's the performance config). Those are 2.5A rated steppers. Actively cooled drivers in that case
harsh-harlequin
harsh-harlequin2y ago
If any damage were to be caused, it would be due to overheating within a motor and the coils starting to short. In the case of the drivers, it would be a similar thing (overheating). Not sure if you were able to measure the running temps of the motors and the drivers?
Arthur_C
Arthur_C2y ago
I have (for that purpose) a thermistor on the cooling fin of a stepper driver and am running a Noctua 140mm PC case fan over the steppers. Temps are approx. 35 degrees on the performance setting (1.6AMP). I have not tried running 1.6A without a fan so do not know where temps would be if fan-cooling is off. So back to the problem at hand: with a replaced Manta M8p, checked motor wires for shorts (no short-cirquits found) and replace steppers, what could be the cause of the right motor locking on startup (so already before finalising the booting process). I link the locking of the motor to the very hot stepper but i am not sure if that is correct? Is there a way to check if the motors are ok or if a stepper is fried? @youtian_su @bttuniversity I am seeking some input on how my 2 stepper drivers could have failed in order to prevent a next occurance... I would like to go the performance settings (1.6A) but am a bit affraid that that has contributed to the issue. Would you care to share your thoughts on this?
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