From 4d8e7cdb30b1946debcf9f24ca0791b6f4ad2651 Mon Sep 17 00:00:00 2001 From: Scott Lahteine Date: Fri, 29 Nov 2019 19:45:43 -0600 Subject: [PATCH] Update SKR mini configs --- .../SKR Mini E3 1.0/Configuration_adv.h | 52 +++++++++++++++++++ .../SKR Mini E3 1.2/Configuration_adv.h | 50 ++++++++++++++++++ 2 files changed, 102 insertions(+) diff --git a/config/examples/BigTreeTech/SKR Mini E3 1.0/Configuration_adv.h b/config/examples/BigTreeTech/SKR Mini E3 1.0/Configuration_adv.h index 9048e8161..905457171 100644 --- a/config/examples/BigTreeTech/SKR Mini E3 1.0/Configuration_adv.h +++ b/config/examples/BigTreeTech/SKR Mini E3 1.0/Configuration_adv.h @@ -197,6 +197,56 @@ #define DEFAULT_Kc (100) //heating power=Kc*(e_speed) #define LPQ_MAX_LEN 50 #endif + + /** + * Add an experimental additional term to the heater power, proportional to the fan speed. + * A well-chosen Kf value should add just enough power to compensate for power-loss from the cooling fan. + * You can either just add a constant compensation with the DEFAULT_Kf value + * or follow the instruction below to get speed-dependent compensation. + * + * Constant compensation (use only with fanspeeds of 0% and 100%) + * --------------------------------------------------------------------- + * A good starting point for the Kf-value comes from the calculation: + * kf = (power_fan * eff_fan) / power_heater * 255 + * where eff_fan is between 0.0 and 1.0, based on fan-efficiency and airflow to the nozzle / heater. + * + * Example: + * Heater: 40W, Fan: 0.1A * 24V = 2.4W, eff_fan = 0.8 + * Kf = (2.4W * 0.8) / 40W * 255 = 12.24 + * + * Fan-speed dependent compensation + * -------------------------------- + * 1. To find a good Kf value, set the hotend temperature, wait for it to settle, and enable the fan (100%). + * Make sure PID_FAN_SCALING_LIN_FACTOR is 0 and PID_FAN_SCALING_ALTERNATIVE_DEFINITION is not enabled. + * If you see the temperature drop repeat the test, increasing the Kf value slowly, until the temperature + * drop goes away. If the temperature overshoots after enabling the fan, the Kf value is too big. + * 2. Note the Kf-value for fan-speed at 100% + * 3. Determine a good value for PID_FAN_SCALING_MIN_SPEED, which is around the speed, where the fan starts moving. + * 4. Repeat step 1. and 2. for this fan speed. + * 5. Enable PID_FAN_SCALING_ALTERNATIVE_DEFINITION and enter the two identified Kf-values in + * PID_FAN_SCALING_AT_FULL_SPEED and PID_FAN_SCALING_AT_MIN_SPEED. Enter the minimum speed in PID_FAN_SCALING_MIN_SPEED + */ + //#define PID_FAN_SCALING + #if ENABLED(PID_FAN_SCALING) + //#define PID_FAN_SCALING_ALTERNATIVE_DEFINITION + #if ENABLED(PID_FAN_SCALING_ALTERNATIVE_DEFINITION) + // The alternative definition is used for an easier configuration. + // Just figure out Kf at fullspeed (255) and PID_FAN_SCALING_MIN_SPEED. + // DEFAULT_Kf and PID_FAN_SCALING_LIN_FACTOR are calculated accordingly. + + #define PID_FAN_SCALING_AT_FULL_SPEED 13.0 //=PID_FAN_SCALING_LIN_FACTOR*255+DEFAULT_Kf + #define PID_FAN_SCALING_AT_MIN_SPEED 6.0 //=PID_FAN_SCALING_LIN_FACTOR*PID_FAN_SCALING_MIN_SPEED+DEFAULT_Kf + #define PID_FAN_SCALING_MIN_SPEED 10.0 // Minimum fan speed at which to enable PID_FAN_SCALING + + #define DEFAULT_Kf (255.0*PID_FAN_SCALING_AT_MIN_SPEED-PID_FAN_SCALING_AT_FULL_SPEED*PID_FAN_SCALING_MIN_SPEED)/(255.0-PID_FAN_SCALING_MIN_SPEED) + #define PID_FAN_SCALING_LIN_FACTOR (PID_FAN_SCALING_AT_FULL_SPEED-DEFAULT_Kf)/255.0 + + #else + #define PID_FAN_SCALING_LIN_FACTOR (0) // Power loss due to cooling = Kf * (fan_speed) + #define DEFAULT_Kf 10 // A constant value added to the PID-tuner + #define PID_FAN_SCALING_MIN_SPEED 10 // Minimum fan speed at which to enable PID_FAN_SCALING + #endif + #endif #endif /** @@ -960,6 +1010,8 @@ */ //#define POWER_LOSS_RECOVERY #if ENABLED(POWER_LOSS_RECOVERY) + //#define BACKUP_POWER_SUPPLY // Backup power / UPS to move the steppers on power loss + //#define POWER_LOSS_ZRAISE 2 // (mm) Z axis raise on resume (on power loss with UPS) //#define POWER_LOSS_PIN 44 // Pin to detect power loss //#define POWER_LOSS_STATE HIGH // State of pin indicating power loss //#define POWER_LOSS_PULL // Set pullup / pulldown as appropriate diff --git a/config/examples/BigTreeTech/SKR Mini E3 1.2/Configuration_adv.h b/config/examples/BigTreeTech/SKR Mini E3 1.2/Configuration_adv.h index 56710f3d2..7bdbe0e29 100644 --- a/config/examples/BigTreeTech/SKR Mini E3 1.2/Configuration_adv.h +++ b/config/examples/BigTreeTech/SKR Mini E3 1.2/Configuration_adv.h @@ -197,6 +197,56 @@ #define DEFAULT_Kc (100) //heating power=Kc*(e_speed) #define LPQ_MAX_LEN 50 #endif + + /** + * Add an experimental additional term to the heater power, proportional to the fan speed. + * A well-chosen Kf value should add just enough power to compensate for power-loss from the cooling fan. + * You can either just add a constant compensation with the DEFAULT_Kf value + * or follow the instruction below to get speed-dependent compensation. + * + * Constant compensation (use only with fanspeeds of 0% and 100%) + * --------------------------------------------------------------------- + * A good starting point for the Kf-value comes from the calculation: + * kf = (power_fan * eff_fan) / power_heater * 255 + * where eff_fan is between 0.0 and 1.0, based on fan-efficiency and airflow to the nozzle / heater. + * + * Example: + * Heater: 40W, Fan: 0.1A * 24V = 2.4W, eff_fan = 0.8 + * Kf = (2.4W * 0.8) / 40W * 255 = 12.24 + * + * Fan-speed dependent compensation + * -------------------------------- + * 1. To find a good Kf value, set the hotend temperature, wait for it to settle, and enable the fan (100%). + * Make sure PID_FAN_SCALING_LIN_FACTOR is 0 and PID_FAN_SCALING_ALTERNATIVE_DEFINITION is not enabled. + * If you see the temperature drop repeat the test, increasing the Kf value slowly, until the temperature + * drop goes away. If the temperature overshoots after enabling the fan, the Kf value is too big. + * 2. Note the Kf-value for fan-speed at 100% + * 3. Determine a good value for PID_FAN_SCALING_MIN_SPEED, which is around the speed, where the fan starts moving. + * 4. Repeat step 1. and 2. for this fan speed. + * 5. Enable PID_FAN_SCALING_ALTERNATIVE_DEFINITION and enter the two identified Kf-values in + * PID_FAN_SCALING_AT_FULL_SPEED and PID_FAN_SCALING_AT_MIN_SPEED. Enter the minimum speed in PID_FAN_SCALING_MIN_SPEED + */ + //#define PID_FAN_SCALING + #if ENABLED(PID_FAN_SCALING) + //#define PID_FAN_SCALING_ALTERNATIVE_DEFINITION + #if ENABLED(PID_FAN_SCALING_ALTERNATIVE_DEFINITION) + // The alternative definition is used for an easier configuration. + // Just figure out Kf at fullspeed (255) and PID_FAN_SCALING_MIN_SPEED. + // DEFAULT_Kf and PID_FAN_SCALING_LIN_FACTOR are calculated accordingly. + + #define PID_FAN_SCALING_AT_FULL_SPEED 13.0 //=PID_FAN_SCALING_LIN_FACTOR*255+DEFAULT_Kf + #define PID_FAN_SCALING_AT_MIN_SPEED 6.0 //=PID_FAN_SCALING_LIN_FACTOR*PID_FAN_SCALING_MIN_SPEED+DEFAULT_Kf + #define PID_FAN_SCALING_MIN_SPEED 10.0 // Minimum fan speed at which to enable PID_FAN_SCALING + + #define DEFAULT_Kf (255.0*PID_FAN_SCALING_AT_MIN_SPEED-PID_FAN_SCALING_AT_FULL_SPEED*PID_FAN_SCALING_MIN_SPEED)/(255.0-PID_FAN_SCALING_MIN_SPEED) + #define PID_FAN_SCALING_LIN_FACTOR (PID_FAN_SCALING_AT_FULL_SPEED-DEFAULT_Kf)/255.0 + + #else + #define PID_FAN_SCALING_LIN_FACTOR (0) // Power loss due to cooling = Kf * (fan_speed) + #define DEFAULT_Kf 10 // A constant value added to the PID-tuner + #define PID_FAN_SCALING_MIN_SPEED 10 // Minimum fan speed at which to enable PID_FAN_SCALING + #endif + #endif #endif /**