Configuring S42B Close Loop Stepper Controller

Adamfilip

I have just wired up my S42B and Motors

After i changed settings, I do calibrated and it started working

This is my current settings for it,

M569 P5 R0 S0 T3.33:3.33:5:0                                      ; physical drive 0 goes backwards previously P0, p5 is on expansion board
M569 P8 R0 S0 T3.33:3.33:5:0                                  ; physical drive 1 goes backwarsa previously P1, p8 is on expansion board
M569 P2 S0                                       ; Z physical drive 2 goes backwards
M569 P3 S1                                       ; Extruder physical drive 3 goes Forwards
M584 X5 Y8 Z2 E3                                 ; set drive mapping , old X0 Y1 
M350 X16 Y16 Z32 I0                              ; configure microstepping without interpolation, previously 32
M350 E16 I1                                      ; configure microstepping with interpolation
M92 X100 Y100 Z1593 E409             ; set steps per mm
M566 X600 Y600 Z20 E800 ; Set maximum instantaneous speed changes (mm/min) JERK
M203 X9000 Y9000 Z1500 E10000 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 Z250 E5000 ; Set accelerations (mm/s^2)
M906 X1400 Y1400 Z1500 E1300 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
M572 D0 S0.0125 ; Pressure Advance

Adamfilip

Woohoo Got it working. check out demo
https://youtu.be/Qz6EoinibEc

Phaedrux

@Adamfilip Very cool. Thanks for sharing. Let us know how it works out in practice.

arhi

@alankilian said in Configuring S42B Close Loop Stepper Controller:

I don't mean to be Captain Obvious, but do you have the system configured for enable=low?

tried both !Enable and Enable configuration for the good measure, no help

Also, do you have both power supply grounds connected together and to GND on the servo?

yes

Also tried 1234 dip's as 1111 (default, first two are what I understand microstepping, third is open/closed control and fourth is write enable for calibration), 1100, 1101, 0000, 0011, 0001 ... no change

at one point I got it to "turn" but was going into "error" after few steps but most of the time it just won't turn at all ... wasted too much time with it I'll try a second driver and a second motor to be sure but I'm moving with my testing to other systems I think this one was just not meant to be

fcwilt

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

Woohoo Got it working. check out demo
https://youtu.be/Qz6EoinibEc

In real world printing what conditions would correspond to displacing the position with your thumb as you did in your video?

Thanks.

Frederick

Adamfilip

@fcwilt none this was as test to see if it would return back to position. this is to help recover from layer shifts.
if nozzle gets snagged on something.. its an issue that has been a problem for me and I havent found another mechanical reason to resolve it.

fcwilt

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

if nozzle gets snagged on something.. its an issue that has been a problem for me and I havent found another mechanical reason to resolve it.

I've seen the nozzle get snagged on bits of the previous layer sticking up, most always in the area of the gap created by holes the are being made in a vertical section of the object.

It would be interesting to see how these devices would behave when that happened.

I may have to try closed-loop.

Thanks.

Frederick

Adamfilip

Im still trying to resolve some glitches and reached out to BIGTREETECH for support.

Sometime its working fine and sometimes they are not responding at all.. and sometimes they will vibrate very strongly. perhaps its a magnet issue..I think im going to crazy glue the magnet onto the stepper motor shaft.

CNCModeller

@adamfilip

What wiring configuration did you end up with?

I'm considering trying out the MKS servo42 which has similar connections.

Many thanks
Barry M

Masso

@adamfilip the magnet placing is very sensitive, with my previous Creality and SKR boards I just could not get the distance to work right on the y-axis on my ender 5+ b/c it is a dual shaft stepper.

The x-axis always worked fine (OEM complete motor with board and screen already installed out of the box), absolute delight not to have layer shifts anymore, for example PETG blob blocking the carriage and ruining the whole print.

Masso

@arhi check if microstepping is 16, dipswitch 4 on, 123 off => press calibrate, make sure the carriage is in the middle of the axis b/c it will calibrate in both directions.

then make sure to press reset and the screen really resets, otherwise it won't work

then dip 4 off, 1 and 2 stay off and dip 3 on, that's it

I wouldn't recommend it without the OLED screen

there is one more thing which may affect you, in Marlin I had to change minimum_stepper_pulse to 3 instead of 2 and maximum_stepper_rate to 150000 from 250000

arhi

@masso said in Configuring S42B Close Loop Stepper Controller:

@arhi check if ..

not running marlin, was stepping from my own rig, very slow, like 1sec on, 1sec off, so that was not an issue... configuration and calibration were all ok, oled on all 5 drivers ... it's just not working ok, skipping steps, missing positions .. dunno if it is firmware or hw problem I gave them away my time is waaaaaaaaaaay to valuable to be wasting them on debugging PRC hw

Masso

@arhi I understand completely

BTT quality is a nightmare, don't ask me how I know. I wish I had started with RepRap and Duet board two years ago when I picked up the hobby, but then again, I've gotten an extensive education on what doesn't work and a bigger appreciation for what does.