No voltage across e0 or e1 heater pins...

ktong

Hi All,

Making some progress since my first post (though unresolved...I decided to move forward to proceed with testing the rest of the system).

Thus far, it seems I got most of the rest of the system working...except for some reason, I see no voltage across the e0/e1 heater screw terminals and not sure how to further troubleshoot. (I see some old posts that are somewhat related...but they have not helped...)

STATUS: Duet 2 V1.04 powered on, running RepRap Firmware 3.1.0 and connected via DWC 3.4.1. Going through the recommended commissioning steps. Activating the Tool 0 Heater 1 and setting the active temperature to 35.

ISSUE: The hot end temperature does not go up.

TROUBLESHOOTING:

Verified the sensor is working (touching the hotend with my hand results in an increase in temperature)
Verified the heater is working (measured resistance of ~6ohms)
Verified that powering the heater with 12 V results in the sensor rapidly increasing in temperature.
Measured the voltage across e0 and e1 screw terminals and see no voltage though I do see a voltage of ~12 volts across the power to the Duet and ~12volts across the heat bed terminals when I set the heatbed to active via DWC.
NOTE: Setting the Heater 1 to active funny enough doesn't give me that heating-too-slowly-fault that I get when doing the same to heatbed even though the temp isn't rising...that's odd right?
NOTE: Also I read that there is suppose to be an LED that turns on when the heater is on...and I don't see an LED...though I do see one when I active the heatbed

REQUEST: Any tips on where in the software files I should be looking to troubleshoot this issue? Or anything on the board I can probe to see if there is indeed something wrong with the board?

Thanks in advance,
K

P.S. I am getting a bunch of server errors when trying to upload the config.g file and a screenshot so I copied a snippet of the config.g below:

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00                               ; enable 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"e0temp" Y"thermistor" T100000 B4138  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e1heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                   ; set temperature limit for heater 1 to 280C

jay_s_uk

i would suspect DWC 3.4.1 doesn't work with 3.1.0 as it uses M568 to set heater temps etc.
Upgrade the RRF side to 3.4.1.
Always keep RRF and DWC in sync

ktong

@jay_s_uk
Ah...I see. Okay. Thanks for the information. (I didn't know they need to be in sync.) I guess I have to go fix my previous issue then.

Will report back once I do so.

ktong

@jay_s_uk

Thanks again for the reply. I was just able to resolve the firmware issue mentioned in my original post.

So now DWC and RRF are both on 3.4.1 but looks like I am still seeing the same issue.

So I went through the same commissioning step of setting the active temp for Heater 1 to 35, but I still see no LED light up for either e0 or e1 and I don't see any voltage across either pins.

Funny enough though, I am getting the heating-too-slowly-fault which I guess is a step in the right direction.

Any other suggestions? Is there a command that I can run to directly switch on the voltage to the e0 or e1?

Thanks,
K

jay_s_uk

@ktong have a go at tuning the heater using M303 T0 S240 and see if it heats up

engikeneer

@ktong think RRF only accepts heating commands above 45C by default. Have you tried just setting a higher demand temp e.g. 70C?

ktong

@engikeneer
@jay_s_uk

Apologies for the wild goose chase. I think my initial problem has been resolved.

(1) So I am just going to say I was looking at the wrong spot for the e0/e1 LEDs. I was looking close to the connector (similar to the LED for the heater bed) but I now see the LEDs are along the edge of the board. As such, I can confirm that when Heater 1 is active, the LED was working (even when setting the active temp to 35)
(2) As for the voltage issue...initially I was probing the the top of the screw terminals and seeing there was no voltage and no temp increase with the wires attached. I then removed the wires thinking it was some other issue but never replaced them after updating the firmware and such. In hindsight, the top of the screw probably wasn't making any electrical connection when loose...so after I tighten the screws down, I am indeed reading a voltage of ~12V. So that is definitely my bad.

Calling this resolved though I will need to go through the heater tuning step as suggested by @jay_s_uk

Thanks again all,
K