Hotend heating/cooling jumps
Hello guys,
I have a mysterious failure since a week. If I heat up my hotend everythings fine until it reaches ~170-180°C then the temperature drops immediatly by ~50°C and the hotend continue with heating. If it then got to 190°C it seems to be way too hot because there comes smoke out of the nozzle.
I tested this with original prusa PLA and also other PLA.
If you then cooldown the Hotend the same happens again. So it cools down to ~120°C and then suddenly shows up ~180°C.
To detect the exact temperature where this error occurs i tried to heat up slowly.
Any suggestions? Maybe a broken Thermistor?
Thanks in advance.
Re: Hotend heating/cooling jumps
More than likely a broken or intermittent wire for the thermistor. Check all your bundles for kinks, check the thermistor connection at the Einsy.
Re: Hotend heating/cooling jumps
So Double checked the cable ans the Connection to the Rambo board. Seems all fine to me. Only thing I saw was that the cable coming out from thermistor seems a little to hot because it changed color from white to brown.
Everything else seems to be fine.
I also tried to shake the cable and watched for temperature changings but nothing happened.
Re: Hotend heating/cooling jumps
So I ended up with changing Thermistor to a PT100 from E3D and therefore rebuild the firmware with proper changes. I also changed the wiring. But the problem persists. The Temperature of the hotend's still jumping by an offset of about 50 Degrees. I don't know what to do.
Please help!!!
Re: Hotend heating/cooling jumps
So I ended up with changing Thermistor to a PT100 from E3D and therefore rebuild the firmware with proper changes. I also changed the wiring. But the problem persists. The Temperature of the hotend's still jumping by an offset of about 50 Degrees. I don't know what to do.
Please help!!!
What firmware changes did you do?
I am also planning to change the standard thermistor to PT100 and amplifyier board and a new 40W heater cartridge. The only change I reckon is needed to uncomment this line:
#define E3D_PT100_EXTRUDER_WITH_AMP
On all the other places I see checks whether this is defined or not, so it will do all the other changes automatically.
Michael
Re: Hotend heating/cooling jumps
Hi there,
I'm looking for advice on how to connect the 3-wire PT100 to the Einsy
Looking at the documentation:
https://github.com/ultimachine/Einsy-Rambo/blob/1.1a/board/Project%20Outputs/Schematic%20Prints_Einsy%20Rambo_1.1a.PDF
Page 5 has the EXT P3 layout. I'm going to connect GND to [7] and 5V to [1].
My question, the signal wire needs an analog input, do I connect to the non-GND pin for the current extruder thermistor input or choose another?
Re: Hotend heating/cooling jumps
So I ended up with changing Thermistor to a PT100 from E3D and therefore rebuild the firmware with proper changes. I also changed the wiring. But the problem persists. The Temperature of the hotend's still jumping by an offset of about 50 Degrees. I don't know what to do.
Please help!!!
Hi stevenSTS,
I'm looking for advice on how to connect the 3-wire PT100 to the Einsy
Looking at the documentation:
https://github.com/ultimachine/Einsy-Rambo/blob/1.1a/board/Project%20Outputs/Schematic%20Prints_Einsy%20Rambo_1.1a.PDF
Page 5 has the EXT P3 layout. I'm going to connect GND to [7] and 5V to [1].
My question, the signal wire needs an analog input, do I connect to the non-GND pin for the current extruder thermistor input or choose another?
Re: Hotend heating/cooling jumps
So I ended up with changing Thermistor to a PT100 from E3D and therefore rebuild the firmware with proper changes. I also changed the wiring. But the problem persists. The Temperature of the hotend's still jumping by an offset of about 50 Degrees. I don't know what to do.
Please help!!!
Hi stevenSTS,
I'm looking for advice on how to connect the 3-wire PT100 to the Einsy
Looking at the documentation:
https://github.com/ultimachine/Einsy-Rambo/blob/1.1a/board/Project%20Outputs/Schematic%20Prints_Einsy%20Rambo_1.1a.PDF
Page 5 has the EXT P3 layout. I'm going to connect GND to [7] and 5V to [1].
My question, the signal wire needs an analog input, do I connect to the non-GND pin for the current extruder thermistor input or choose another?
My initial thought worked, printing running well now.