mega 2650 error: temp. raised to slow rise = .043 after 13079 ms

nick7777

I have order new correct watt heaters, tried different ext. Connection on board, and also voltage tested at all connections from power supply. I cleared the eeprom and reloaded factory firmware as well. Any thoughts why its not heating fast enough? I am running 3950 100k thermistor an 40w ceramic heater on v6 hotend clone. With no fan it will creep to temp after about 5-10 minutes, with full fan it times out everytime.

RAyWB

sounds like operating 24V heater at 12V Supply...

nick7777

They are 12v heaters, i bought them new to verify. 3.5 ohms when i tested.

nick7777

In addition i swapped known working thermistors and tested the heater via the other connections on the mega(heated bed and 2nd extruder input)

Roko

did you do a PIDtune?

nick7777

I have, maybe not in the correct fashion? Would that make it stall at 140c with full fan on the hotend? I had everything working, then i was tweaking eeprom retract settings and it hasnt been heating right since

RAyWB

what´s your Max PID setting?

should be:

#define EXT0_PID_MAX 255

Repetier

For debugging always use a temperature monitor on server or host. There you see output power. If it needs rising a good part it should increase power to 100%, if not config has limited PWM like RAyWB said, if it is 100% you have not enough power for more temperature.

MartinH

nvm, miss read problem

nick7777

Pwm is set to 255. It basically hits a wall once it is over 140c. What do you recommend for hz on a 40w 12v heater? I am stumped, as i have switched the boards out and tried a marlin firmware install but the issue still persisted. I went back to the previously runningg repetier firmware and board as nothing changed.

RAyWB

did you measure hotend temperature by external Thermometer ordid you try to push Filament through the Extruder by Hand? as MartinH wrote it also could be reading problem

nick7777

I cant measure much over40c. It is not completely accurate. This may have somthing to do with it. Also the firmware i downloaded did not have a thermistor table in it, is this required in repetier or is it buried in one of the arduino sketchs?

Repetier

Also check
#define EXT0_PID_INTEGRAL_DRIVE_MAX 140

default is quite limited and that is max. when control takes over. But a temperature curve as I told would you show directly what the error is.

Firmware contains some typically used thermistor curves, so if you selected the right type that is ok.

nick7777

I believe i selected the correct type, i will also post a screenshot of the curve when i get home this evening.

MartinH

what controller board are you using ?

nick7777

Mega 2650 with ramps. I believe it is a knockoff, as it is from he3d for their delta k200

nick7777

Mega 2650 with ramps. I believe it is a knockoff, as it is from he3d for their delta k200

nick7777

attached is the temperature graph

nick7777

17:44:52.528: Error:One heater seems decoupled from thermistor - disabling all for safety!

17:44:52.528: Error:Temp. raised to slow. Rise = -0.25 after 31049 ms

17:44:52.544: Disabling all heaters due to detected sensor defect.

17:44:52.544: DebugLevel:14