Motor phase A and B may be disconnected reported from driver 2



  • Hello all,

    I'm totally new here, I just got a Duet 2 Wifi yesterday.

    I was so excited to set that up.

    However I have at the moment two issues.

    The first is "Motor phase A and phase B may be disconnected reported by driver 2"

    I checked my crimps, tugged on my wires. Everything looks okay. I tried to swap the wires but I keep having the same error so I put them how it was wired originally on the Anet A8. I read on here that people seemed to have the same issue with an older firmware or with low current motor.

    I have a Duet 2 Wifi 1.02 or later
    Firmware 2.05.1
    Wifi server version 1.23
    Web interface version 1.22.6

    Second thing. I wired a bltouch as per the wiki. I did my config with the configurator. I can't deploy or retract the bltouch at all.

    Same thing here, checked my crimps and double checked my connections and my config. It seems all good.

    Here is my config.g if it can help :

    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Mon May 04 2020 13:12:37 GMT-0400 (Eastern Daylight Time)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"Metal Machine" ; set printer name

    ; Network
    M552 S1 ; enable network
    M586 P0 S1 ; enable HTTP
    M586 P1 S0 ; disable FTP
    M586 P2 S0 ; disable Telnet

    ; Drives
    M569 P0 S0 ; physical drive 0 goes forwards
    M569 P1 S0 ; physical drive 1 goes forwards
    M569 P2 S1 ; physical drive 2 goes backwards
    M569 P3 S0 ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X100.00 Y100.00 Z400.00 E415.00 ; set steps per mm
    M566 X600.00 Y600.00 Z18.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z180.00 E6000.00 ; set maximum speeds (mm/min)
    M201 X1500.00 Y1500.00 Z100.00 E10000.00 ; set accelerations (mm/s^2)
    M906 X500 Y500 Z500 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X-33 Y-10 Z0 S1 ; set axis minima
    M208 X220 Y220 Z240 S0 ; set axis maxima

    ; Endstops
    M574 X1 Y1 S0 ; set active low and disabled endstops
    M574 Z1 S2 ; set endstops controlled by probe

    ; Z-Probe
    M307 H3 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
    M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X0 Y-38 Z2.36 ; set Z probe trigger value, offset and trigger height
    M557 X20:200 Y20:200 S40 ; 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 C7.060000e-8 R4700 ; set thermistor + ADC parameters for heater 0
    M143 H0 S130 ; set temperature limit for heater 0 to 130C
    M305 P1 T100000 B4725 C7.060000e-8 R4700 ; set thermistor + ADC parameters for heater 1
    M143 H1 S400 ; set temperature limit for heater 1 to 400C

    ; Fans
    M106 P0 S0 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 F0 ; 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

    ; Custom settings are not defined

    ; Miscellaneous
    T0 ; select first tool

    Thank you so much in advance, and I hope to be soon good enough to be able to provide help to others around here.



  • EDIT : I tried to wire only one Z motor and put the jumpers in ZB connector. I still have the same error, I tried with both motor


  • administrators

    Are there any markings on the Z motor to indicate its type?

    Have you set up the deployprobe.g and retractprobe.g files for the BLTouch?



  • Hello,

    Thanks a lot for giving me a hand.

    On the motors it is written :

    Anet Step motor
    42SHDC3025-24B

    My deployprobe.g reads as such :

    ; deployprobe.g
    ; called to deploy a physical Z probe
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Mon May 04 2020 13:12:37 GMT-0400 (Eastern Daylight Time)
    M280 P3 S10 I1 ; deploy BLTouch

    and my retractprobe.g :

    ; retractprobe.g
    ; called to retract a physical Z probe
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Mon May 04 2020 13:12:37 GMT-0400 (Eastern Daylight Time)
    M280 P3 S90 I1 ; retract BLTouch

    Thanks once again for the help, I really appreciate it



  • Okay what I did is wire both of my motors to the same connector (ZA) and instead of 500mA I put 1000mA.

    Now my Z axis is moving. The only thing left is the BLtouch.

    Now that I can home Z, I realise that it doesn't use my BLtouch for the homing, I pull and push the pin manually and it doesn't stop.

    Thanks in advance for all the help



  • Note that I have a genuine BLtouch classic if it might help you troubleshoot my problem



  • Funny thing, I was having these exact same issues the other day, but assumed I had 7 faulty motors as we were robbed the week before and they threw everything on the floor that they didn't want to steal.

    Was also on the Z motors and my BL deploys, and then just stays there. 😐

    At least my motors have a bit of hope then. Been meaning to finish off the project. But need to redesign the X to move the hotend 20mm down so it can reach the bed.

    Out of interest, did you perhaps try allocate E1 as a second Z motor driver aswell?



  • No I didn't try to reallocate anything. And honestly since now my Z axis is working I'm scared to touch anything, I'm just super glad I got this part working. I really hope I can get my bltouch working now so I can finally enjoy my shiny new board



  • I measured the voltage going into the bltouch and it's 4.95v which I'm sure is okay. I'm really clueless now



  • Last post !

    Found out my issue was completely stupid. I had a bad multimeter that showed continuity in my servo wire when there was none, it was broken

    Now it works !

    Thanks a lot for everything


  • Moderator

    Glad you got it sorted out! BLTouch wiring has given many people a headache.



  • Yeah but it is so easy with the tutorial. I can't believe my multimeter was the main culprit ahahah


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