I’m currently in the process of wiring my mpcnc and I came a cross a couple of issues that I don’t really know where they stem from.
- SKR Pro V1.2 with TFT35 V3.0
- 5x TMC2209
- Bench top power supply set to 12V 5A (temporary)
- 22 AWG cable for wiring the stepper motors
- V1CNC_SkrPro_Dual_2209-184.108.40.206-src.zip (pre-configured)
- disabled the sensorless pins
- set the drivers to UART
- connected the motors individually to the drivers on the SKR Pro for dual endstop support:
- motor X0 to X
- motor X1 to E0
- motor Y0 to Y
- motor Y1 to E1
- motor Z to Z
- connected both motor and board power inputs to the power supply
- hooked up the touchscreen display
- flashed both the SKR Pro and display with preconfigured firmware
- connect the end stops anywhere
- the SKR PRO and touch screen seem to be flashed right
- the z-axis moves up and down fine
Generally works fine when moving in one direction, however every time I suddenly step in the opposite direction the X1-motor seems to lag a little behind X0, before it engages (turns on).
UPDATE: Seems like I was mistaken here! The X-motor doesn’t really do anything, however I had briefly connected it to the Z-port on the SKR Pro and then it moved. I’ve also tested its driver with another motor and that seems to work too. Driver, cable, and motor are thus fine. I’m cluesless!
At first I thought the that the Y0-motor was moving in the opposite direction of the Y1-motor, however when touched the pulley on its shaft while prompting the motor to move, it rather seemed to spin through. Note that this is not the case, if I power everything down. The pulley is firmly attached with Loctite. The motor also rattles loudly while doing this.
UPDATE: The motor seems to turn about a turn in one direction and then abruptly turns a little in the other direction, which makes it seem like it spins through. My guess is that there’s something wrong with it, but I don’t know how to test it further.
I’ve already excluded that there’s something wrong with its cable or driver. Bother have been tested with other motors and they work fine.
The TFT often displays these warning (when starting up), however the machine still seems to be able to move.
- controlled all cables that I did the connections of with a multimeter
- checked the stepper motors by attaching an LED to see if it lights up if the shaft gets turned
- checked the voltage that the SKR Pro puts out for the motors, and here Y and E0 don’t seem to output any current, whereas all the others seem to provide a small voltage when prompted to?
- switched out the drivers of Y and E0 but nothing really changed
Unfortunately, I hadn’t tested the hardware before assembling the mpcnc, which probably would have been easier.