Revision as of 20:52, 13 May 2020

Data

SSR - 5 hz max reliable switching frequency. [1]. 0.5 hz recommended for heating.
Overshoot is 10-30C on the bed. D3D_v20.04.27_Data_Collection#Hysteresis_of_Bed

M303 S50 E-1 C5 - 5 passes, set for 50C, -1 for bed

PID Autotune - [2]

Using Lulzbot Cura, M303 with no parameters heats the extruder to about 150. Each time division is about 30 seconds:

And produces optimal values of P, I, D

M503 displays current values:

< M503

...

< echo:PID settings:

< echo: M301 P22.20 I1.08 D114.00

You can save the values from PID Autotune by going into configuration.h

PID autotune would have to be enabled for the bed in configuration.h.
If one is using an SSR, can this be used with default switching frequency of Marlin? Let's look inside Marlin - Configuration.h
SSR heats up when conducting via voltage drop. The switching doesn't cause much heat. [3]. See SSR Lifetime. It is not clear if fast switching (only 8 hz) reduces lifetime over say 4 hz in PWM switching?
Start by turning on PID for the bed: uncomment #define PIDTEMPBED in configuration.h
SOFT_PWM - sets PWM frequency?

@@ Line 39: / Line 39: @@
 *SSR heats up when conducting via voltage drop. The switching doesn't cause much heat. [https://www.google.com/search?q=does+ssr+heat+upon+switching&oq=does+ssr+heat+upon+switching&aqs=chrome..69i57.4819j0j4&client=ubuntu&sourceid=chrome&ie=UTF-8]. See [[SSR Lifetime]]. It is not clear if fast switching (only 8 hz) reduces lifetime over say 4 hz in PWM switching?
 *Start by turning on PID for the bed: uncomment #define PIDTEMPBED in configuration.h
+*SOFT_PWM - sets PWM frequency?
 =Links=
 *Marlin - PID autotune - [https://marlinfw.org/docs/gcode/M303.html]