Heater fault. replacement of PT100 and heater cartrudge did not help

dc42

The Smart Effector is not protected against short circuit. The latest Duets have a fuse in the VIN supply to the fans, however it won't necessarily stop the fan mosfet from blowing if you get a short in a fan circuit.

The power supplies used in 3D printers are invariably short circuit protected, however that doesn't stop then supplying enough current to burn out PCB traces.

c310

@dc42 said in Heater fault. replacement of PT100 and heater cartrudge did not help:

The Smart Effector is not protected against short circuit. The latest Duets have a fuse in the VIN supply to the fans, however it won't necessarily stop the fan mosfet from blowing if you get a short in a fan circuit.

now i have upgraded power supply to 24v-14amps mean-well. fans and heating cartridge were upgraded by 24v version too.
after that i successfully run M303 H1 P1 S200 and stored results by M500.

it still gives me heater fault in the middle of the print.

I run 2.0(RTOS)RC2b (2018-05-13b3)
(in fact firmware upgrade to rtos did not help either

for the test i also connected heating element directly to the board, bypassing smarteffector .

what parameters i can measure on the board to find faulty element. can it be clock or mosfet failure ???

Quadcells

Hi, in the photo I noticed that I see metal washers under the lock nuts. Should be nylon washers to prevent damage to the traces and possible shorts.

dc42

@quadcells said in Heater fault. replacement of PT100 and heater cartrudge did not help:

Hi, in the photo I noticed that I see metal washers under the lock nuts. Should be nylon washers to prevent damage to the traces and possible shorts.

There are clear areas around the 6 mounting holes for the ball studs so normal size metal washers are OK there. If the 3 additional mounting holes are used for any purpose, then nylon washers are needed at those locations.

c310

@dc42 please let me know what i can measure on the board to fix it... i do not feel it is right to buy a new one without fixing attempts???
can i send you board for repair???

thanks!

dc42

@c310 said in Heater fault. replacement of PT100 and heater cartrudge did not help:

@dc42 please let me know what i can measure on the board to fix it... i do not feel it is right to buy a new one without fixing attempts???
can i send you board for repair???

thanks!

I've lost track: what is it that you need to fix?

Quadcells

@dc42, sorry, thanks for the clarification.

c310

@dc42 said in Heater fault. replacement of PT100 and heater cartrudge did not help:

I've lost track: what is it that you need to fix?

well, i'm trying to resolve heater fault issue. i was changing components one by one, but it did not help.

as of now i have upgraded PSU to meanwell 24v 14a, replaced fans and heater cartridge to 24v , new PT-100
basically everything is new and 24v (was 12v). new heating element was successfully calibrated via M303

I run 2.0(RTOS)RC2b (2018-05-13b3)
(in fact firmware upgrade to rtos did not help either)

system still produces heater fault error (temperature was rising slowly than 0.3 deg per sec )

from the side it looks like heating element lost power (at some point temperature start falling down very slowly and )

question: what i can measure on the board to fix it... i do not feel it is right to buy a new one without fixing attempts???
can i send you board for repair???

many thanks in advance !

ayudtee

@c310 You mentioned "from the side it looks like heating element lost power" If you see the heater LED on the smart effector go out it likely points to a bad crimp on the smart effector cable connection. Wiggle the cable the next time you see this, or simply redo the crimp connection.

c310

@ayudtee said in Heater fault. replacement of PT100 and heater cartrudge did not help:

ooks like heating element lost power"

to avoid such a situation i wired heater directly to the board..