Duet 3 Mini 5+ and Loud Hiss from Z Motor

[blt3dp]

Hi All, I just finished assembling a Voron 0.1 using a Duet Mini 5+, MeanWell 24V PSU and a set of motors from Stepper Online (this set). I'm getting quite a loud hiss on the Z motor, generally all the time, but of course way more noticeable when it's idle.

Nothing I know to do seems to have helped. Tried tweaking the motor current, idle factor and idle time. I've also tried adjusting M569 for that particular driver to switch between SpreadCycle and StealthChop. I've also tried disabling interpolation for that driver. Nothing seemed to have an effect.

Here's my config.g

; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Fri Jun 03 2022 11:21:39 GMT-0700 (Pacific Daylight Time)
 
; General preferences
G90                                                    ; send absolute coordinates...
M83                                                    ; ...but relative extruder moves
M550 P"Voron"                                          ; set printer name
M669 K1                                                ; select CoreXY mode
 
; Network
M552 P0.0.0.0 S1                                       ; enable network and acquire dynamic address via DHCP
M586 P0 S1                                             ; enable HTTP
M586 P1 S0                                             ; disable FTP
M586 P2 S0                                             ; disable Telnet
 
; Drives
M569 P0.0 S1                                           ; physical drive 0.0 goes forwards
M569 P0.1 S1                                           ; physical drive 0.1 goes forwards
M569 P0.2 S1                                           ; physical drive 0.2 goes forwards
M569 P0.3 S1                                           ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E0.3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                                ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E1411.00                     ; set steps per mm
M566 X360.00 Y360.00 Z30.00 E360.00                    ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z900.00 E12000.00             ; set maximum speeds (mm/min)
M201 X2000.00 Y2000.00 Z45.00 E200.00                  ; set accelerations (mm/s^2)
M906 X1000 Y1000 Z280 E800 I30                         ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                                ; Set idle timeout
 
; Axis Limits
M208 X0 Y0 Z0.1 S1                                     ; set axis minima
M208 X120 Y120 Z120 S0                                 ; set axis maxima
 
; Endstops
M574 X2 S1 P"io1.in"                                   ; configure switch-type (e.g. microswitch) endstop for high end on X via pin io1.in
M574 Y2 S1 P"io2.in"                                   ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin io2.in
M574 Z1 S1 P"io3.in"                                   ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin io3.in
 
; Z-Probe
M558 P0 H5 F300 T12000                                 ; disable Z probe but set dive height, probe speed and travel speed
M557 X20:100 Y20:100 S20                               ; define mesh grid
 
; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B3950           ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                                     ; create bed heater output on out0 and map it to sensor 0
M307 H0 R0.535 K0.442:0.000 D3.99 E1.35 S1.00          ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                                ; map heated bed to heater 0
M143 H0 S120                                           ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4725 C7.06e-8  ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                                     ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 R2.494 K0.474:0.000 D3.70 E1.35 S1.00          ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                           ; set temperature limit for heater 1 to 280C
 
; Fans
M950 F0 C"out5" Q500                                   ; create fan 0 on pin out5 and set its frequency
M106 P0 S0 H-1                                         ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out6" Q500                                   ; create fan 1 on pin out6 and set its frequency
M106 P1 S1 H1 T45                                      ; set fan 1 value. 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
M911 S21.9 R22.9 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

Here's a link to the specific Z motor here

Anyone have any suggestions?

[jumpedwithbothfeet]

@blt3dp have you tried swapping the motor/wiring with another to narrow down the cause?

[blt3dp]

@jumpedwithbothfeet

I can’t say I’ve tried that. It’s one of those motors with a detachable cable, I might be able to try that.

But the motor seems to be working fine during homing and movement, just makes this hiss all the time. I’d have thought that if wiring were bad, it wouldn’t be working right.

[blt3dp]

@jumpedwithbothfeet

Swapped in another motor, used the same wiring, and config mostly (only changed steps per mm and current) and it's perfectly silent. While moving and while at idle. Of course I can't permanently use this motor as it doesn't have a short leadscrew attached. But something I noticed when I was looking at the original motor. When I put a multimeter on the pins to double check what pins were the ends of a coil, the beep from my multimeter would be scratchy/choppy, whereas on every other motor I've checked it beeps clear and steady. I'm starting to think it's something with this particular motor.

[blt3dp]

@blt3dp

Well, LOL. I ended up cutting the leadscrew off of the "bad" motor and attached it to the other motor I had tested with. It's completely silent now.