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bigtreetech / BIGTREETECH-S42B-V1.0

The closed-loop drive is to feedback the rotation angle of the stepping motor to the control panel, compare the distance that needs to be rotated with the distance of the actual rotation, calculate the error value, and then compensate, so as to prevent the problem of multi-step and lost step. The closed-loop drive can completely overcome the lost step of the open-loop stepping motor, and can also significantly improve the performance of the motor at high speed
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Steppers misbehaving workaround and steps per mm wrong #14

Closed Marcusbjol closed 3 years ago

Marcusbjol commented 3 years ago

When I recieived the 2 stepper motors, one did not move. I followed the fixes in teaching techs video by changing 2 lines in config_adv.h

define MINIMUM_STEPPER_PULSE 3

define MAXIMUM_STEPPER_RATE 150000

After implementing this, both steppers worked.

However, both have radically altered the steps per mm setting. Before the changes, they were set to 1280 with 16 microstepps. After, the movement was way off. By some experimentation, I was able to get it to print properly with y 204.95 and x 207.03 and 32 microsteps on both.

Reading config_adv.h, I will try

define MINIMUM_STEPPER_PULSE 1

define MAXIMUM_STEPPER_RATE 500000

to match the driver.

BluPix commented 3 years ago

Hi, i have discovered from manual that 32 microsteps means 8192 steps per 360° revolution. So correct formula for steps per mm is: 8192 steps per revolution / (2mm GT2 belt 20 tooth per revolution ). example: 8192 / (2 16) = 256 8192 / (2 * 20) = 204.8

kamilj commented 3 years ago

When I recieived the 2 stepper motors, one did not move. I followed the fixes in teaching techs video by changing 2 lines in config_adv.h

define MINIMUM_STEPPER_PULSE 3

define MAXIMUM_STEPPER_RATE 150000

You do not read the documentation :P

42 Stepper Motor Closed Loop Driver Board User Guide ShenZhen BigTree Technology CO.,LTD .

5、We found that when SKR V1.3 motherboard was used to drive this driver, the motor did not rotate after the motherboard gave S42B pulse.This is because the pulse frequency was too fast and S42B could not be detected. At present, there are two ways to modify: 1.Modify pulse width and pulse frequency in Marlin firmware. Details: Modify the high pulse width in configuration. adv,

define MINIMUM_STEPPER_PULSE 3

define MAXIMUM_STEPPER_RATE 150000

2.Modify the pulse signal sampling frequency in the S42B firmware source code.

Marcusbjol commented 3 years ago

The documentation is poorly written and translated (former tech documenter here). I did find a solution and documented it here for others to find.

Funny enough, hard coding

define MINIMUM_STEPPER_PULSE 1

define MAXIMUM_STEPPER_RATE 500000

works as well.

fjrpilot05 commented 3 years ago

@Marcusbjol You are absolutely correct. As it turns out it appears that your suggestion works better especially when the implementation is mixed with TMC2209's on the other axes. I think this is so because these settings are global across all axes and the suggested settings in the manual (pulse 3 and rate 150000) severely hamper the 2209s.

Quas7 commented 3 years ago

EDIT: I was interpreting the function wrong! setting TB6600 in Marlin will reduce all driver timings not only the respective axis! As I only have the extruder running on a hybrid stepper driver, I increased MAXMUM_STEPPER_RATE in configuration_adv.h to get at least the 500mm/s speed limitation on my X/Y removed.

in Marlin firmware you can just select the TB6600 drivers for the axis with the S42B in the Configuration.h Stepper Drivers section. Worked for me without issues with TMC2209 on X/Y/Z and only extruder with S42B.

This activates this timing profile just for the respective axis (see configration_adv.h in Marlin).

Minimum delay before and after setting the stepper DIR (in ns) 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)

Minimum stepper driver pulse width (in µs) 3 : Minimum for TB6600 stepper drivers

Maximum stepping rate (in Hz) the stepper driver allows 150000 : Maximum for TB6600 stepper driver

and I also activated this here as well for my TMCs /**

fjrpilot05 commented 3 years ago

Thats an awesome suggestion. I'm gonna try that right away. Thank you

Marcusbjol commented 3 years ago

Seeing odd behavior regardless of which stepper timing I set (tried their recommended settings). The first move of the X-axis moves very rapidly and then moves as expected. Their firmware needs some work.

Additionally, as stated before, their solution degrades performance with their TMC2130 stepper drivers as well.

They are responsible for providing compatible firmware for all their products (using BTT SKR 1.4 Turbo, BTT 2130 Drivers for Z+E0+E1, and BTT closed loop for X+Y). Incomplete product they need to update.

Quas7 commented 3 years ago

@Marcusbjol for the rapid movement at (re-)enabling you can check here (solved): https://github.com/bigtreetech/BIGTREETECH-S42B-V1.0/issues/3

The timing can be set in Marlin per axis using the "TB6600" timing profile without impacting other stepper drivers (EDIT: not true, will change all other steppers to slowest timing as well). Marlin documentation improvment for this is suggest already here: https://github.com/MarlinFirmware/Marlin/issues/19391

Marcusbjol commented 3 years ago

Implementing that fix solved the issues.

Thanks for the help guys.

fjrpilot05 commented 3 years ago

in Marlin firmware you can just select the TB6600 drivers for the axis with the S42B in the Configuration.h Stepper Drivers section. Worked for me without issues with TMC2209 on X/Y/Z and only extruder with S42B.

This activates this timing profile just for the respective axis (see configration_adv.h in Marlin).

Minimum delay before and after setting the stepper DIR (in ns) 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)

Minimum stepper driver pulse width (in µs) 3 : Minimum for TB6600 stepper drivers

Maximum stepping rate (in Hz) the stepper driver allows 150000 : Maximum for TB6600 stepper driver

and I also activated this here as well for my TMCs /**

  • Beta feature!
  • Create a 50/50 square wave step pulse optimal for stepper drivers. */

    define SQUARE_WAVE_STEPPING

Hey Quas7, I just wanted to circle back and Thank you for your suggestions. I've got my setup pretty much to a happy place thanks to your suggestions.

Regards, Kevin

Quas7 commented 3 years ago

Hey Kevin,

great that it worked out as intended and thanks for giving positive feedback. :) Edit: please check the latest edits above! I was providing wrong infos!

Best regards, Till

GIANNHSitia commented 3 years ago

hello, i have same problem. i change X , Y axis driver with S42B 1.1 . Working but with wrong steps per mm..For examper: instead of moving 150mm this move 120mm.. with old driver work ok.. i add to configuration.h this lines.... but dont change nothing. how to fix this? sorry but my english is not good My printer is Malyan M150 with menzli board with onboard A4982

define X_DRIVER_TYPE TB6600

define Y_DRIVER_TYPE TB6600