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