Z Motor weak / one missing [solved for now]

dc42

Please post your config.g file.

Buj

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Tue Nov 13 2018 10:58:17 GMT-0500 (Eastern Standard Time)

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

M667 S1 ; Select CoreXY mode

; Network
M550 PFraMal ; Set machine name
M552 S1 ; Enable network
M587
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M584 X0 Y1 Z2:4:5:6 ; Assing drivers to Z axis
M569 P0 S0 ; Drive 0 goes forwards
M569 P1 S0 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M350 X16 Y16 E16 Z16 I1 ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z4000.00 E420.00 ; Set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; Set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z200.00 E250.00 ; Set accelerations (mm/s^2)
M906 X800.00 Y800.00 Z1200 E1200:1200:1200 I30 ; Set motor currents (mA) and motor idle factor in per cent

M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X1200 Y1200 Z1000 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 Z1 S1 ; Set active low endstops

; Z-Probe
M558 P5 H5 F120 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X15:6 Y15:195 S20 ; Define mesh grid

; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Automatic saving after power loss is not enabled

; Custom settings are not configured

SupraGuy

@buj said in Z Motor weak / one missing:

System is 24 volts powered
Core XY
This is my Driver mapping. I am controlling 4 nema 23 motors
M584 X0 Y1 Z2:4:5:6 ; Assign drivers to Z axis
X and Y are fine

Try

M584 X0 Y1 Z2:4:5:6 E3 ; Assign drivers to Z axis, unassign 4 from E axis.

If the motor on drive 2 isn't turning, check that the jumpers are on the second output of drive 2. If they aren't, then that motor will be open circuit, since the second motor boss is in series with the first one.

Buj

@supraguy said in Z Motor weak / one missing:

then that motor will be open circuit, since the second motor boss is in series with the first one.

Jumpers are present,and installed as per factory. could they be defective? i doubt but at this point... i'll check

thanks

Buj

[Update] From what i hear from theZ axis motor is that the signal frequency is too high and motors start skipping assoonas they recieve a signal . going downward is easier...

Buj

Reduced the Z acceleration from 200 to 50. Now going up and down as expected.
Still no output from drive 2 Z motor...

Stephen6309

@Buj
Z axis acceleration is probably too high, if there is no mechanical problem.

Buj

Mouvement out of 3 motors remapped as per config with low acceleration, still missing the 4th motor connected to Z output of DUET wifi

dc42

Did you correct the M584 command as @SupraGuy suggested? That's very important, see the bold text at https://duet3d.dozuki.com/Wiki/GCode#Section_M584_Set_drive_mapping.

Buj

the assign beeing M584 X0 Y1 Z2:4:5:6 E3
i understand that etruder is assign to 3? isnt it?
how do i unassign a drive?

dc42

@buj said in Z Motor weak / one missing:

the assign beeing M584 X0 Y1 Z2:4:5:6 E3
i understand that etruder is assign to 3? isnt it?
how do i unassign a drive?

Yes, that M584 command is correct. Do you still have the problem?

It may help diagnose the problem if you upgrade to firmware 2.02RC3 because it has better stepper driver diagnostics.

Buj

The printer is on the move to the Maker Fair. will persue at a later date.

Thanks#

SupraGuy

The reason for explicitly assigning E to drive 3 is that by default it would be ... E3:4 -- with drive 4 also assigned as an E axis. (As per the bolded text in the article dc42 linked.)