Duet2 V1.04. Motor not energized but steps seen on oscilloscope

A Former User

Thank you for your quick response.

No, there's no Config-override.g.

There's bed, config, homedelta, pause, resume, sleep, stop, tfree0, tpost0 and tpre0.g.

I configured as a MiniKossel, because I'll eventually be using it to control a similar delta printer.

dc42

How have you tried to move the motor? On a delta, the only types of move allowed before the printer has been homed are G1 moves with the S1 or S2 (or H1 or H2) parameter, and only if the machine is in relative movement mode (G91). See https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareDeltaPrinter#Section_Testing_the_motors_and_endstops_individually.

A Former User

I have tried with home moves, and wtih the S1 parameter as described in your testing the motors individually guide.

As I indicated, I do see step pulses on the X_step pin of the diagnostic pad on the board with my oscilloscope, but of course no movement since the motor has no current.

Thank you for your help.

A Former User

Could I please get a further suggestion for resolving my problem of no motor current on my Duet2?

T3P3Tony

When you home do the other two towers move and just the X not work?

A Former User

Thank you T3P3Tony,

No. No movement on any motors.

I have put a motor into each of the motor connectors and none of them is energized.

My 24 volt power supply shows a draw of about 100mA, but none of the motors is energized.

I have checked the ENN pin of the TMC2660 chips, they are at ground. There is 24 volts at the appropriate pins of the TMC2660s, and 3.3 volts at their supply.

T3P3Tony

@vbiondo please post your homedelta.g

Also when are your endstops showing as being triggered when you look at the machine properties page of settings in Duet Web Control:
https://duet3d.dozuki.com/Wiki/Duet_Web_Control_Manual#Section_Machine_Properties
If you trigger them does the status change?

A Former User

Tony,

My X,Y, and Z endstops show as "No" ( not hit ) unless I short 1&3 of the endstop connector, then they show "Yes."

E0 is opposite, shows as "Yes" unless 1&3 are shorted.

Below is my homedelta.g file. Shouldn't my motors be energized regardless of homedelta?

Thank you.

; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool v2 on Wed May 22 2019 17:26:42 GMT-0700 (Pacific Daylight Time)
G91 ; relative positioning

;*** Slow homing has been configured. Change F180 to F1800 below when your configuration is working
G1 S1 X265 Y265 Z265 F180 ; move all towers to the high end stopping at the endstops (first pass)
G1 X-5 Y-5 Z-5 F1800 S2 ; go down a few mm
;*** Slow homing has been configured. Change F180 to F360 below when your configuration is working
G1 S1 X10 Y10 Z10 F180 ; move all towers up once more (second pass)
G1 Z-5 F2400 ; move down a few mm so that the nozzle can be centred
G90 ; absolute positioning
G1 X0 Y0 F2400 ; move X+Y to the centre

Veti

how exactly did you determine the phases of your motors?

deckingman

I don't know much about Delta's but @dc42 said above that the only moves allowed before homing are G1 with an S parameter and only if G91 relative is set. Yet the config file shows G90 (absolute).

T3P3Tony

@vbiondo that home delta looks ok to me. If it had been blank or something then maybe the motors would not be energised as they had not received a valid command to home. Although thinking about it you say you have seen the step pulses going to the driver so that does not make sense. I wonder if the ENN line is not switching for all the stepper drivers. See if pin 19 on the steppers is going low when movement is commanded.

@deckingman that's why the homedelta.g switches them to relative before homing them.

MoczikGabor

Does the extruder motor move?

If you can not heat up, use "M302 S1" to allow cold extrusion.

T0
M302 S1
M83
G1 E+100 F500

MoczikGabor

HW check ideas, since you have an oscilloscope:

Do any signal present on TMC's OA1 OA2 OB1 OB2 pins? (during move)
What can you measure between BRA/BRB and GND? 1. Measure resistance without power, 2. check on scope during move.
Between SRA/SRB and GND?
You verified that the TMC's get 24V and the STEP signals. This is where everything gets interesting... But does them get GND?

dc42

Please upgrade your firmware to version 2.02, which will provide better diagnostics.
Please verify that you have continuity from the Duet motor headers right through to your motors. With power off but motors connected, use your multimeter to measure the resistance between the two pins at one end of the X motor connector, by touching the probes on the motor connector spills on the underside of the Duet. It should read a few ohms, the resistance of one motor phase. Then check the resistance between the two pins at the other end of the X motor connector. Likewise you should get a few ohms resistance between. There should be on continuity between any pair of pins on the X motor connector that are not next to each other, or between the two middle pins.

A Former User

@veti
I determined the phases of my motors using an ohmmeter to find the low resistance pairs.

Also, it corresponded to the motor manufacturer's spec sheet.

A Former User

@t3p3tony
The ENN pin is always low.

A Former User

@moczikgabor
No, the motor doesn't energize or move on either E0 or E1.
I used the commands you described, thank you:

T0
M302 S1
M83
G1 E+100 F500

dc42

The only explanation I can think of is that the SPI MOSI pin from the MCU isn't getting to the TMC2660 drivers, so they are not getting programmed. But it must have been working when the Duet was tested. Assuming it's a genuine Duet, I'm happy to approve a warranty replacement if you want to try another one.

A Former User

@dc42
I updated the firmware to 2.02, no change.

I purchased my Duet from Matter Hackers, so I believe it should be genuine.

Please direct me as to how to get a warranty replacement.

Thank you.

T3P3Tony

@vbiondo Matterhackers are one of our US resellers so it will be genuine. Contact their support and reference this thread. They should point you to a warranty return form to capture the details.