Can you post your full config.g and the results of M122 and M98 P"config.g"?

Can you check this troubleshooting step please?

https://docs.duet3d.com/User_manual/Connecting_hardware/Temperature_connecting_PT100#troubleshooting

@Phaedrux I will try that and report back. Thanks.

@jjem I worked with the dev team and struggled with poor closed loop behaviour, from memory axis jitters and choppy motion.

Based on the latest dev work I guess there were some issues with commutation and an on axis encoder that is "loosely coupled" with the motor hence the need for a motor shaft encoder as well as an axis feedback encoder.

I abandoned on axis closed loop, in favour of just motor closed loop and the team said they'd look into it some more. I guess the latest dev activity is the result of further thinking.

I've been out of the loop for quite a while so it's great to see the duet team have continued with development.

All the best
Barry M

for low voltage high current dc powered bed you can also use external high power mosfet with a heatsink . usually will be cheaper then ssr .

@silveroranges said in Duet 3 Heater failed open:

the heater is a 350mmx350mm 24v heater that is 430watts

That thing draws ~18 amps - did you have to replace the 15A fuse, and if yes: with what?

I think you’ve blown the MOSFet - take a look at your board for visible damage of a chip. Can you publish a good narrow shot of the board?

@jjem said in RRF 3.5beta2/closed-loop encoder config-problems:

Is there scope for doing linear encoding (with the Renishaw LM10, for example) without also having the magnetic shaft encoder?

No. We need the magnetic encoder so that we can set the coil currents the desired angle ahead or behind the current step phase position to reasonable accuracy. In effect we are treating the stepper motor like a BLDC motor with a very high number of poles. BLDC motors that can operate over a wide range of speeds in either direction have built-in sensors for commutation.

OTOH it may in future be possible to run the stepper motor in open loop mode and use the linear encoder to monitor deviation between commanded and actual position.

Our magnetic encoder board takes up about 15mm of depth on the back of the stepper motor, including the connector.

@dc42
Between the TC input (when disconnected) and the chassis ground. I’m still scratching my head over it.

@dc42
Just a quick reply...
I replaced the mosfet with:
AOSS32334C

It was a little challenging to solder but I could replace the part and the board just works fine again.

Thanks for the support.

@gloomyandy thanks

@T3P3Tony I swapped the motor for another. unsure if it was the Wires/Connection or motor itself and it solved the problem.

@droftarts
wiring diagram
Screenshot 2023-03-05 180213.png

@mendelevium
Basically, the PS-ON pin supplies a switched negative ground. Taking a positive from the PSU 12v provides a supply of 12vdc. I use simplify 3d so I put M80 in my start script when a print is started and M81 when a print is finished after all cools down and machine returns to idle state. This can be used to trip my contactor and switches everything off. Thanks for the tip DIY-O_Sphere.

I know this is an old topic, but I'm running into exactly the same issue. Did you find a solution to this??

My bad, it turns out my coordinates for the leadscrews were way off, I honestly don't even know what I was doing!

@dc42 I was only able to get them to work together on a home by creating a second axis and hiding that axis and homing them together.

@JabawokJayUK said in Toolboard 1LC Address not recognised?:

M950 F3 C"!121.out1+121.out1.tach" T3

The CAN address must always come right at the start of the port name string and should not be repeated. So this should be:

M950 F3 C"121.!out1+out1.tach" T3

Thanks @Phaedrux ! I got it back up n running

@dc42 Thank you for your answer.
So for the moment, I will wire the serial port to the IO_1 of the mainboard 6XD as it is working and move my button (in this io for the moment) toward the expansion board. It is not a problem I think.

The commands that I send to the UART are just json data.
The WLED support json API via Serial : https://kno.wled.ge/interfaces/json-api/
JSON over Serial
You can send commands to the WLED instance via Serial using the JSON API.
To request a JSON response containing the state and info objects, send {"v":true}.

for example I send such command :

; TURN ON ALL THE STRIPS M118 P5 S"{""on"":true}" ;LAUNCH HOMING ANIMATION M118 P5 S"{""ps"":1}" ; LAUNCH ALERT ANIMATION M118 P5 S"{""ps"":99}" ; PUT BRIGHTNESS TO 255 M118 P5 S"{""bri"":255}"

@JabawokJayUK So the main thing is that the resistance will increase with temperature when using a PTC but it will decrease with temperature when using an NTC. The Steinhart formula should fit either curve if it's given the right values.