another spurious heater issue

[deckingman]

@günter-jibben You said this.................

.............with my hotend heated to 120 as well. I get
Error: Heater 1 fault: exceeded allowed temperature excursion: target 120.0°C actual 135.5°C

Heater 1 is the hot end - not the bed. So the fault that was generated refers to the hot end reaching 135.5 deg C when the target temperature was set to 120 degC. You can play around all you want with the bed PID settings, but it won't have any effect on the hot end heater fault.

[Norder]

@deckingman
You are confusing something there. @cncmaker wrote that, not me.
He has the problem and I just wanted to help.

----- Original Text -----

Da verwechselst Du etwas. Das hat @cncmaker geschrieben, nicht ich.
Er hat das Problem und ich wollte nur helfen.

[deckingman]

@günter-jibben Ahh OK. For info, the OPs second M307 will override the first. So the B1 in the first M307 will be overridden by the B0 in the second M307 (but he still has a problem with heater 1, which is nothing to do with the PID settings for heater 0).

[Norder]

@deckingman
Oh, that will be completely overwritten, I thought it would complement each other and this could lead to errors.
OK thank you for the info.

Yes, then the problem is probably somewhere else.

Google Translate
----- Original Text -----

Ach das wird komplett überschrieben, ich dachte es würde sich ergänzen und dadurch könnte es zu Fehlern kommen.
OK, Danke für die Info.

Ja, dann liegt der Fehler wohl woanders.

[cncmaker]

Thank you for the help. Sorry about the confusion I am currently having issues with H1 the hotend heater. I was having the opposite issue with the bed that it wasnt heating up fast enough.

Ive built 14 cnc type machines and designed 7 of them. I have modded/upgraded/overhauled a couple hundred machines. CNC, 3d printers, engravers, plotters, whatever.
I usually use marlin or GRBL except for one rrf machine and that was running rrf1 and I didnt like it too much. This tevo overhaul is a customer request. I am still on the fence about rrf overall I like it I just need some more screw ups to happen so i actually know what I am doing. Im thinking about switching my MPCNC over to rrf if I can figure it out.
@Phaedrux

@deckingman I am not 100% sure if I have the thermistor set up properly.I know it is a 3950 100k thermistor. I use it as a type 13 with marlin all the time.
I have a bunch of thermistors but dont know the values of them and find it hard to figure out exactly how to determine the b number i need. I can easily measure resistance i have a high end fluke meter with temperature but not a second meter. I installed it then tuned it i thought correctly but it seems i have something messed with my config file.

One thing about the thermistor say the value was incorrect so why the overshoot? Its not reading right when does the machine realize that 120 is 135? If the thermistor is wrong its wrong it should just goto 120 and think its 120 even if its only 80, instead of blowing by it. Am I wrong?

I seen in thnother thread about some heater issues faults with 3.4 i was thinking of downgrading to 3.3.

[deckingman]

@cncmaker You haven't necessarily messed anything up. If you've done the PID tuning and correctly entered the results in your config.g, then it might just be that the heater is overpowered for the heater block. PID control can only do so much. I have very little information to go on except your original post where you stated that there was a fault message triggered by the heater reaching 135 when the set point was 120. Coupled with what seems to be a rapid rise time in the graph you posted, indicates that it might be a temperature overshoot. What is the power of the cartridge and are you sure it's the correct voltage for your machine?

You don't have an M570 in your config.g so default values would apply. You could use M570 to provide wider fault tolerance (say 25 Deg for 20 secs), but be aware that if you get a genuine fault, bad things might happen.

[cncmaker]

@deckingman said in another spurious heater issue:

@cncmaker You haven't necessarily messed anything up. If you've done the PID tuning and correctly entered the results in your config.g, then it might just be that the heater is overpowered for the heater block. PID control can only do so much. I have very little information to go on except your original post where you stated that there was a fault message triggered by the heater reaching 135 when the set point was 120. Coupled with what seems to be a rapid rise time in the graph you posted, indicates that it might be a temperature overshoot. What is the power of the cartridge and are you sure it's the correct voltage for your machine?

You don't have an M570 in your config.g so default values would apply. You could use M570 to provide wider fault tolerance (say 25 Deg for 20 secs), but be aware that if you get a genuine fault, bad things might happen.

So I'm just about to determine the thermistor by measuring the R at 25C and then 100c, change it over to Kelvin then some division I believe and confirm the thermistor for sure.

So its a micro Swiss hotend with a 40w cartridge. This is mostly a conversion on a working tevo tornado that I've already done a bunch of upgrades to.

Thank you for the m570 idea though I can at least make the machine work now

[engikeneer]

@cncmaker just double checking, you aren't using a 12V heater in a 24V system? else you'll actually have a 160W heater and bad things may happen...

[cncmaker]

@engikeneer said in another spurious heater issue:

@cncmaker just double checking, you aren't using a 12V heater in a 24V system? else you'll actually have a 160W heater and bad things may happen...

I wish thats what it was. I measured the resistance it came out to 14.8r so thats a 24v cartridge

[Phaedrux]

Can you post your config-override.g file? Maybe you're loading some old tuning values that are over writing the values you've copied into config.g

Did the PID tuning for the hotend heater go alright?

That rapid of a heatup sure seems like a 12v heater on a 24v system. Do you have another cartridge to test with?

[cncmaker]

@phaedrux sorry for the late reply I had to go away for a little while.
config-override.g
The cartridge had 24v printed on it and the measured resistance of the cartridge was 14.7. On top of that the cartridge works with marlin. I will still try another cartridge as I have many.

[Phaedrux]

Config-override.g
M307 H1 R3.052 K4.617:0.786 D4.61 E1.35 S1.00 B0 V24.1

Config.g
M307 H1 R3.087 K0.572:0.000 D3.68 E1.35 S1.00 B0 V24.1

Is that perhaps the difference between you tuning it as a tool, versus tuning it as a simple heater?

[cncmaker]

@phaedrux
So I went into the override file and it says dont modify or delete lines or whatever. So I took the tuning values from the config file and pasted them in. This worked.

I always wondered why it showed as a tool so what did i do wrong and what can i do to fix it?

Thanks alot

[Phaedrux]

the values in config-override.g are written there when you send M500. Which you would normally do after tuning completes.

What command did you use to start the tuning?

[cncmaker]

@phaedrux m303 h1 s240 or something like that. I cant seem to see a history of my commands in dwc.

I dont know if i should start a new thread but id like to ask you about another issue im having.

I followed this link to connect a 12864 display I used this menu system suggested in the above link.
I tried updating thru dwc all it did was put the folder on the system. I seen that the files are suppose to be in a menu folder which i created and added the files to it. Im using a reprap full graphics display which is a 12864. I dont get any sort of menu on the display.

[Phaedrux]

@cncmaker said in another spurious heater issue:

m303 h1 s240

That's for tuning as a heater. M303 T0 S240 would tune it as a tool including the cooling fan.

@cncmaker said in another spurious heater issue:

I dont know if i should start a new thread but id like to ask you about another issue im having.

Yes best to create a new thread.