PID Tuning

noblebran

@jay_s_uk thank you, I do have the part cooling fans running during tuning. I am, I am running a 40 watt heat cartridge, I bought everything from e3d and its been great. Never had an issue.

m307 h1

Heater 1 model: heating rate 3.658, cooling time constant 136.6, dead time 14.00, max PWM 1.00, calibration voltage 0.0, mode PID
Computed PID parameters: setpoint change: P3.5, I0.080, D34.2, load change: P3.5, I0.124, D34.2

I am running it now to see if it matches.

noblebran

@jay_s_uk now I get this:

Auto tuning heater 1 completed after 3 idle and 5 tuning cycles in 659 seconds. This heater needs the following M307 command:
 M307 H1 B0 R3.539 C260.4 D14.22 S1.00 V23.1
Send M500 to save this command in config-override.g

m307 h1
Heater 1 model: heating rate 3.539, cooling time constant 260.4, dead time 14.22, max PWM 1.00, calibration voltage 23.1, mode PID
Computed PID parameters: setpoint change: P3.5, I0.058, D35.3, load change: P3.5, I0.106, D35.3

They seem to be slightly different but my heat temp still goes above 250 when aiming for 210.

jay_s_uk

@noblebran yep, that looks pretty normal.
Add M307 H1 B0 R3.539 C260.4 D14.22 S1.00 V23.1 to your config.g or send M500 (ensuring M501 is at the end of your config.g) and check that config-override.g matches

jay_s_uk

@noblebran said in PID Tuning:

They seem to be slightly different but my heat temp still goes above 250 when aiming for 210.

did you tune as H1 or T0?

noblebran

@jay_s_uk I tuned as H1 as my fan was already on.

jay_s_uk

@noblebran you're best of tuning using T0 as the PWM power will be adjusted automatically to take into account whether the fan is on or not

noblebran

@jay_s_uk said in PID Tuning:

M307 H1 B0 R3.539 C260.4 D14.22 S1.00 V23.1

I had that in my config already, that is why I am so confused...

noblebran

@jay_s_uk I will do that.

noblebran

@jay_s_uk

@jay_s_uk said in PID Tuning:

@noblebran you're best of tuning using T0 as the PWM power will be adjusted automatically to take into account whether the fan is on or not

Still after all the tuning, I am running the T0 as mentioned and look at this graph. I have seen literally no changes.

Crazy, huh???

jay_s_uk

@noblebran what type of hotend are you running? thats stupidly fast heat up
is your config.g correct for your thermistor?

noblebran

@jay_s_uk its all e3d volcano, just replaced everything with this build. Granted it is extremely warm and humid where I am right now.

This is what I am using for the thermistor:

M308 S1 P"e0temp" Y"thermistor" T100000 B4138      ; configure sensor 1 as thermistor on pin e0temp

I believe that is correct?

jay_s_uk

@noblebran if you're using an E3D thermistor, no

M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.060000e-8

Can you confirm what you purchased?

noblebran

@jay_s_uk

@noblebran said in PID Tuning:

@jay_s_uk its all e3d volcano, just replaced everything with this build. Granted it is extremely warm and humid where I am right now.

This is what I am using for the thermistor:
M308 S1 P"e0temp" Y"thermistor" T100000 B4138      ; configure sensor 1 as thermistor on pin e0temp
I believe that is correct?

I do not have the e3d thermistor then. It is just a regular type k thermistor. I will order a new one, but I ran it on smoothieware for years and never had an issue. odd I how I don't have a problem now, I am buying a new block that allows the use of a cartridge but the one I have now isn't big enough for a cartridge.

Do you know of anyway to compensate or reduce the power to the cartridge to allow it to heat up less?

The cartridge is 12v also, not sure if that matters. I would think if it is 24v (set up that way) wouldn't it burn up?

Phaedrux

@noblebran said in PID Tuning:

type k thermistor.

Do you mean type k thermocouple?

@noblebran said in PID Tuning:

The cartridge is 12v also, not sure if that matters.

M307 H1 B0 R3.539 C260.4 D14.22 S1.00 V23.1

Yikes, yes it does. It looks like you're running a 12v heater at 24v. Hence the insanely fast heat up. DO NOT DO THIS. Replace the heater with 24v immediately and don't use it until you do.

noblebran

@phaedrux

@phaedrux said in PID Tuning:

Yikes, yes it does. It looks like you're running a 12v heater at 24v. Hence the insanely fast heat up. DO NOT DO THIS. Replace the heater with 24v immediately and don't use it until you do.

Okay, thank you!

noblebran

@phaedrux

@phaedrux said in PID Tuning:

@noblebran said in PID Tuning:

type k thermistor.

Do you mean type k thermocouple?

@noblebran said in PID Tuning:

The cartridge is 12v also, not sure if that matters.

M307 H1 B0 R3.539 C260.4 D14.22 S1.00 V23.1

Yikes, yes it does. It looks like you're running a 12v heater at 24v. Hence the insanely fast heat up. DO NOT DO THIS. Replace the heater with 24v immediately and don't use it until you do.

Can't believe I overlooked that!