I have been battling an issue with my duet3d wifi board for the past couple months. At first I assumed it was user error on my end, but at this point I am leaning more towards an issue on the board itself. Whether it's me or the board I'd love to get some assistance and see what might be causing this issue.
As the title of the post states my issue is on driver 2, Z axis movement with a short-to-ground Error. I am using a dual Z set up with the following stepper motors:
Iverntech NEMA 17 Stepper Motor Amazon link
Iverntech NEMA 17 Stepper Motor with Integrated 310mm T8 Lead Screw
Specifications:
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Led screw diameter: 8mm
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Lead screw length: 310mm (±1mm)
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Step angle : 1.8 degree
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Nut material: Brass
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Holding Torque: 400mN*m
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Thrust(full step): 12.5kg
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Rated Current/Phase: 1.5A
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Rate Voltage: 3.3v
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Rated Resistance/Phase: 2.2ohms ± 10%
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T8 refers to an acme-thread, 4-lead rod, much better suited for this application. The correct pulses per mm for this rod, assuming a 1.8 degree step motor, and 1/16 step setting on the driver, is 400. This rod moves the nut 8 mm per revolution.
When both of these motors are plugged into Drive 2 (ZA & ZB) and I attempt to home Z with a simple limit switch either one motor will fail to rotate or both will grind in an effort to home the axis. This will result in a homing failed and will always throw a "short-to-ground driver 2" error.
When one stepper is in ZA and the other in E1 the bed will move as desired and home without issue, but I still get the "short-to-ground driver 2" error.
In my efforts to troubleshoot this issue I have done the following:
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I've placed the board on a hard wood frame with no metalic debre on top or below to eliminate any sort of short possibility.
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I have replaced the wiring 3+ times and have tested with a multimeter for shorts in the wiring from the stepper motors to the board itself.
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I have run M906 which shows currents are at 85% of rated:
Motor current (mA) - X:1445, Y:1445, Z:1275, E:0:0:0:0:0:0:0:0:0, idle factor 30%
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I have also run M122:
M122
=== Diagnostics ===
Used output buffers: 3 of 32 (13 max)
=== Platform ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 1.21 running on Duet WiFi 1.02 or later
Board ID: 08DDM-9FAM2-LW4S4-6J1DG-3S86M-1MSZX
Static ram used: 16152
Dynamic ram used: 100448
Recycled dynamic ram: 2184
Stack ram used: 1224 current, 4448 maximum
Never used ram: 7840
Last reset 00:01:26 ago, cause: software
Last software reset at 2018-08-27 17:25, reason: User, spinning module GCodes, available RAM 7760 bytes (slot 2)
Software reset code 0x0003 HFSR 0x00000000, CFSR 0x00000000, ICSR 0x0441f000, BFAR 0xe000ed38, SP 0xffffffff
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms
MCU temperature: min 32.7, current 33.7, max 33.8
Supply voltage: min 24.3, current 24.4, max 24.6, under voltage events: 0, over voltage events: 0
Driver 0: standstill, SG min/max 0/73
Driver 1: standstill, SG min/max 0/80
Driver 2: short-to-ground standstill, SG min/max 0/379
Driver 3: standstill, SG min/max not available
Driver 4: standstill, SG min/max 31/217
Date/time: 2018-08-27 17:26:52
Slowest main loop (seconds): 0.014308; fastest: 0.000046
=== Move ===
MaxReps: 2, StepErrors: 0, LaErrors: 0, FreeDm: 240, MinFreeDm 236, MaxWait: 604525135ms, Underruns: 0, 0
Scheduled moves: 7, completed moves: 7
Bed compensation in use: none
Bed probe heights: 0.000 0.000 0.000 0.000 0.000
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
=== GCodes ===
Segments left: 0
Stack records: 1 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is idle in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
Lastly a copy of my current config.g , As a note: my z-probe is not currently set up, i'm waiting on a diode for "NPN output normally-open inductive or capacitive sensor" from the Duet3d.dozuki wiki
; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
; generated by RepRapFirmware Configuration Tool on Sat Aug 25 2018 16:35:03 GMT-0600 (Mountain Daylight Time)
; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare
M667 S1 ; Select CoreXY mode
; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P4 S1 ; Drive 4 goes forwards (Z2 in the E1)
;Dual Z
M584 X0 Y1 Z2:4 ; Two Z motors connected to driver outputs 2 and 4
M350 X16 Y16 Z16:16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z1600 ; Set steps per mm
M566 X500 Y500 Z10 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z240 ; Set maximum speeds (mm/min)
M201 X500 Y500 Z5 ; Set accelerations (mm/s^2)
M906 X1445 Y1445 Z1275 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 X290 Y290 Z310 S0 ; Set axis maxima
; Endstops
M574 X1 Y1 Z1 S0 ; Set active low endstops
; Z-Probe
M558 P0 H0 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
M557 X50:300 Y50:300 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 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
; Fans
M106 P0 S0.75 I0 F500 H0 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S0.75 I0 F500 H0 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H0 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on
; Tools
M563 P0 D H ; 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
This printer has not been fully set up because I have been stuck on getting the z-axis to more properly. Any help would be greatly appriciated.
