Duet 3 Slow Hotend Heatup, can't even run PID tuning

fractalengineer

Hi,

I'm using a 24V 50W cartridge with a Dyze high temp thermistor on a mosquito hotend.

The R value is appropriate (2200) and the displayed temperature is accurate (measured with a meat thermometer lol)

However the heatup cycle is painfully slow, and can't even complete the PID tuning cycle in time.

I tried with different P values; 0.35, 0.5, 1

Here's the relevant part of my config.g:

; Thermistors
M308 S0 P"temp0" Y"thermistor" A"bed_heat" T100000 B4240 H0 L0 		;Bed thermistor - connected to temp0
M308 S1 P"temp1" Y"thermistor" A"e0_heat" T4606017 B5848 C5.548428e-8 R2200 H0 L0	;Dyze 500c thermistor - connected to e0_heat

; Define Heaters
M950 H0 C"out0" T0				;Bed heater is on out0
M950 H1 C"out1" T1				;Hotend heater is on out1

; Heater model parameters
M307 H0 A90.0 C700.0 D10.0 S1.00 B1 		;Keenovo duet 3 configuration
M307 H1 A580.4 C256.6 D6.4 S0.50		  ; Heating process parameters for 24V a system

M570 S360					;Hot end may be a little slow to heat up so allow it 180 seconds
M143 S300					;Set max hotend temperature

Any thoughts?

Cheers!

bearer

@fractalengineer said in Duet 3 Slow Hotend Heatup, can't even run PID tuning:

R value is appropriate (2200)

Is it? Not sure, and mobile, but if you leave R out, the firmware will use the correct value for your board so that's a sure way of doing it.

aidar

In your config, heater H1 (witch is hotend i assume) is defined to use only 0.5 (S parameter in M307 command) PWM signal. Make it 1.0 (or remove S parameter at all) and try again.

fractalengineer

@bearer , @aidar

Well that's uncanny;

I thought R2200, P1.0 were the Duet3 standard values so I left them on

Removing them actually solved the issues; PID tuning is complete and it heats up to temp in seconds

That board is smarter than it looks

Thanks!

bearer

@fractalengineer said in Duet 3 Slow Hotend Heatup, can't even run PID tuning:

That board is smarter than it looks