@dc42 said in Warning: motor phase A (or B) may be disconnected:

The Duet has two Z motor connectors Za and Zb, one right behind the other. You have only one Z motor, so you are using only one of the connectors. Are there 2 jumpers fitted on the other Z motor connector? They should have been fitted already when you received the Duet. See the top right of the board in the wiring diagram at https://duet3d.dozuki.com/Wiki/Duet_Wiring_Diagrams.

son of a ... that was it! Forgot to install them... oops.

Thanks for the help dc!

@dc42 said in Warning: motor phase A (or B) may be disconnected:

The message is a warning. It doesn't stop the motors working. One possible cause is that is that you are trying to move the Z motor much too fast, and you don't have enough VIN voltage for that speed.

Please post your config.g and homing files.

Thanks for looking into my issue! See below:

config:
; Communication and general
M111 S0 ; Debug off
M550 PD300VS ; Machine name and Netbios name (can be anything you like)
M551 XXXXX ; Machine password (used for FTP)
; *** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xEF ; MAC Address
; Wifi Networking
M552 S1 ; Enable Wifi by default

M555 P2 ; Set output to look like Marlin

; *** Uncomment if you have the optional PanelDue display
;M575 P1 B57600 S1 ; Communication parameters for the PanelDue

G21 ; Work in millimeters
G90 ; Send absolute positional coordinates...
M83 ; ...but relative extruder moves

; Axis and motor configuration
M569 P0 S0 ; Drive 0 goes forwards (X tower)
M569 P1 S0 ; Drive 1 goes forwards (Y tower)
M569 P2 S0 ; Drive 2 goes forwards (Z tower)
M569 P3 S1 ; Drive 3 goes forwards (extruder 1)

M574 X2 Y2 Z2 S1 ; Set endstop configuration (all endstops at high end, active high)

; *** The homed height is deliberately set too high in the following - these will be adjusted with delta auto-calibration
M665 R208.203 L360.31 B140 H432.897 X0.4 Y0.834 Z0.0 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X-2.31 Y-2.38 Z4.68 ; Endstop offset adjustments, these will be adjusted with delta auto-calibration

M350 X64 Y64 Z64 E16 I1 ; Set microstepping to 32 for X, Y and Z and 16 for extruder stepper with interpolation
M92 X800 Y800 Z800 ; Set axis steps/mm
M906 X1000 Y1000 Z1000 E500 ; Set motor currents (mA)
M201 X1000 Y1000 Z1000 E1000 ; Accelerations (mm/s^2)
M203 X20000 Y20000 Z20000 E3600 ; Maximum speeds (mm/min)
M566 X1200 Y1200 Z1200 E300 ; Maximum instant speed changes mm/minute

; Fans
M106 P1 T50 S255 H1 ; Set hotend heatsink FAN1 thermostatic control at 50�C

; Thermistors
M305 P0 T100000 B3950 R4700 L54 H-97 ; Kapton bed heater thermistor
M305 P1 R4700 T100000 B4725 C7.06e-8 ; E3D V6 Semitec GT-104 thermistor cartridge

; Heater configuration
M307 H0 B1 ; Heater 0 (bed) use bang-bang control
M307 H1 A512.9 C267.0 D9.0 B0 ; Heater 1 (hot end) use PID

; Tool definitions
M563 P0 D0 H1 ; Define tool 0, the extruder
G10 P0 S0 R0 ; Set tool 0 operating and standby temperatures
M92 E800 ; Set extruder steps per mm

; Z probe and compensation definition
; Change "H25" to "H3" AFTER commissioning your printer
M558 P4 X0 Y0 Z0 H3 I1 ; FSRs with JohnSL board Z probe behaves as a switch and is not used for homing any axes
G31 X0 Y0 Z-0.25 P500 ; MUST READ: http://www.sublimelayers.com/2017/05/fdffsd.html

T0 ; Select tool 0, the hot end
M501 ; Load config-override.g

config-override.g:
; This is a system-generated file - do not edit
; Delta parameters
M665 L360.310 R210.976 H432.795 B140.0 X-0.034 Y-0.223 Z0.000
M666 X-0.718 Y-3.354 Z4.072 A0.00 B0.00
; Heater model parameters
M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
M307 H1 A512.9 C267.0 D9.0 S1.00 V0.0 B0
M307 H2 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H3 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H4 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H6 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H7 A340.0 C140.0 D5.5 S1.00 V0.0 B0

Homing:
G91 ; use relative positioning
G1 S1 X800 Y800 Z800 F2500 ; move all carriages up 700mm, stopping at the endstops
G1 S2 X-3 Y-3 Z-3 ; move all carriages down 3mm
G1 S1 X6 Y6 Z6 F250 ; move carriages slowly up 6mm, stopping at the endstops
G1 Z-5 F2000 ; down a few mm so that we can centre the head
G90 ; back to absolute positioning
G1 X0 Y0 F2000 ; centre the head and set a reasonable feed rate

Hi ya'll,

Symptoms below. What else should I check? Bad board? Curtains for Moose and Squirrel?

Z-axis doesn't home. Swapping motor cables demonstrates that motor + cable is not the problem.

Error when homing:
Warning: motor phase A may be disconnected reported by driver(s) 2
Warning: motor phase B may be disconnected reported by driver(s) 2

M906
Motor current (mA) - X:1000, Y:1000, Z:1000, E:500:500, idle factor 30%
2/28/2020, 8:40:15 PM
M913
Motor current % of normal - X:100, Y:100, Z:100, E100

=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.05 running on Duet WiFi 1.02 or later
Board ID: 08DGM-9T6BU-FG3SS-6J9FL-3SD6R-1STHF
Used output buffers: 3 of 24 (6 max)
=== RTOS ===
Static ram: 25712
Dynamic ram: 92620 of which 380 recycled
Exception stack ram used: 272
Never used ram: 12088
Tasks: NETWORK(ready,676) HEAT(blocked,1232) MAIN(running,3800) IDLE(ready,160)
Owned mutexes:
=== Platform ===
Last reset 00:01:27 ago, cause: software
Last software reset at 2020-02-28 20:38, reason: User, spinning module GCodes, available RAM 11920 bytes (slot 1)
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
Error status: 0
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms, max retries 0
MCU temperature: min 33.0, current 34.5, max 34.6
Supply voltage: min 24.1, current 24.1, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: standstill, SG min/max not available
Driver 1: standstill, SG min/max not available
Driver 2: standstill, SG min/max not available
Driver 3: standstill, SG min/max not available
Driver 4: standstill, SG min/max not available
Date/time: 2020-02-28 20:40:13
Cache data hit count 258625669
Slowest loop: 2.09ms; fastest: 0.06ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
Hiccups: 0, FreeDm: 160, MinFreeDm: 160, MaxWait: 0ms
Bed compensation in use: none, comp offset 0.000
=== DDARing ===
Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 0
Stack records: 2 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.
=== Network ===
Slowest loop: 15.44ms; fastest: 0.00ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 1 of 8

• WiFi -
  Network state is running
  WiFi module is connected to access point
  Failed messages: pending 0, notready 0, noresp 0
  WiFi firmware version 1.23
  WiFi MAC address bc:dd:c2:45:d1:4b
  WiFi Vcc 3.33, reset reason Turned on by main processor
  WiFi flash size 4194304, free heap 26024
  WiFi IP address 192.168.1.224
  WiFi signal strength -52dBm, reconnections 0, sleep mode modem
  Socket states: 0 0 0 0 0 0 0 0

@shadrincev said in Dead Duet 2 board? Want to triple check before replacing:

@D300VS_duet3d And when you connect the USB, if you touch the processor with your finger, it becomes hot? If so, your Board is dead, you need to change the processor.

Thanks for the tip. Yep, processor gets very hot almost immediately. I guess it's D-E-D dead.

@dc42 said in Dead Duet 2 board? Want to triple check before replacing:

Before you give up, try a different USB cable, and a different USB port on the PC. Also check whether anything on the Duet is getting hot with just USB power applied.

Hi dc42, yes tried on two computers as well. Doesn't look good I guess, especially since the processor gets very hot quickly with USB power. Thank you for looking over my troubleshooting. It wasn't your baby's (the board's) fault, it was mine, actually. All I can say is that my 20 mo old is very fast with a hex key. His precision strike was over in about a plank second. Completely my fault.

Cheers!

Hi all,

Looks like I have a dead board, Duet 2 Wifi, rev 1.2. No network connection to Wifi or indication from the printer hardware that it is booting upon power on. 5V, 3.3V (green), and red light between micro USB and reset button are on. Diagnostic light is also on constantly.

Removed all connections and SD card and then powered up with the computer USB with a verified data cable /port combo. No connection, nothing in device manager shows up. Have BOSSA installed.

Tried holding down erase >1 sec and then push reset (still no SD card). Wasn't sure if I was supposed to keep holding erase so I did it both ways several times. Nothing happens anytime reset was pushed. No change in the lights. No connection to the computer (nothing in device manager COM). Cycled power many times with USB cable. Same story with LED indicators. Sucks!

Toast? Anything else to try?

@whosrdaddy count me as another person with static discharge issues. ground wire seemed to do the trick! Thanks daddy!

@whosrdaddy Whoah, that's crazy but plausible given the low RH% currently being experienced in my home due to the winter. Thank you for the reply and information. I will try immediately, wish me luck, ha.

Started happening out of the blue after a year of flawless operation. The only clue is that there was an apparent error message "Resume-after-power-fail state saved". When I check the printer it is happily chugging along but no extrusion. Have to reset duet 3d to get filament to flow again (no response to manual control).

So far, the same print died but not in the same spot. Nothing unusual about the print. Thinking power supply issue possibly or maybe extruder motor issue but need help getting any info from the duet to diagnose the problem. Thanks all.