Hotbed Mosfet configuration.h code

Comments

• MartinH

  January 2018

  The relay is chattering because you are probably using PID temp control, change the temperature control to use 'bang bang for bed with relay'
  
  
• Repetier

  January 2018

  You might even use bang bang with reduced frequency especially if using a mechanical relay and not a SSR.
• Merlotmaker

  January 2018

  Thank you very much guys
  
  As I am a total novice when it come it altering the configuration.h code, would you please be so kind to have a look at the attached file and tell me exactly which lines must be commented, uncommented and which must be changed.
  
  I really appreciate your assistance.
  
  

  
  

  
  

  //===========================================================================

  //============================= PID Settings ================================

  //===========================================================================

  // PID Tuning Guide here: http://reprap.org/wiki/PID_Tuning

  
  

  // Comment the following line to disable PID and enable bang-bang.

  #define PIDTEMP

  #define BANG_MAX 255 // limits current to nozzle while in bang-bang mode; 255=full current

  #define PID_MAX BANG_MAX // limits current to nozzle while PID is active (see PID_FUNCTIONAL_RANGE below); 255=full current

  #if ENABLED(PIDTEMP)

    //#define PID_AUTOTUNE_MENU // Add PID Autotune to the LCD "Temperature" menu to run M303 and apply the result.

    //#define PID_DEBUG // Sends debug data to the serial port.

    //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX

    //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay

    //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)

                                    // Set/get with gcode: M301 E[extruder number, 0-2]

    #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature

                                    // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.

    #define K1 0.95 //smoothing factor within the PID

  
  

    // If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it

    // Ultimaker

    #define  DEFAULT_Kp 22.2

    #define  DEFAULT_Ki 1.08

    #define  DEFAULT_Kd 114

  
  

    // MakerGear

    //#define  DEFAULT_Kp 7.0

    //#define  DEFAULT_Ki 0.1

    //#define  DEFAULT_Kd 12

  
  

    // Mendel Parts V9 on 12V

    //#define  DEFAULT_Kp 63.0

    //#define  DEFAULT_Ki 2.25

    //#define  DEFAULT_Kd 440

  
  

  #endif // PIDTEMP

  
  

  //===========================================================================

  //============================= PID > Bed Temperature Control ===============

  //===========================================================================

  // Select PID or bang-bang with PIDTEMPBED. If bang-bang, BED_LIMIT_SWITCHING will enable hysteresis

  //

  // Uncomment this to enable PID on the bed. It uses the same frequency PWM as the extruder.

  // If your PID_dT is the default, and correct for your hardware/configuration, that means 7.689Hz,

  // which is fine for driving a square wave into a resistive load and does not significantly impact you FET heating.

  // This also works fine on a Fotek SSR-10DA Solid State Relay into a 250W heater.

  // If your configuration is significantly different than this and you don't understand the issues involved, you probably

  // shouldn't use bed PID until someone else verifies your hardware works.

  // If this is enabled, find your own PID constants below.

  //#define PIDTEMPBED

  
  

  //#define BED_LIMIT_SWITCHING

  
  

  // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.

  // all forms of bed control obey this (PID, bang-bang, bang-bang with hysteresis)

  // setting this to anything other than 255 enables a form of PWM to the bed just like HEATER_BED_DUTY_CYCLE_DIVIDER did,

  // so you shouldn't use it unless you are OK with PWM on your bed.  (see the comment on enabling PIDTEMPBED)

  #define MAX_BED_POWER 255 // limits duty cycle to bed; 255=full current

  
  

  #if ENABLED(PIDTEMPBED)

  
  

    //#define PID_BED_DEBUG // Sends debug data to the serial port.

  
  

    //120V 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)

    //from FOPDT model - kp=.39 Tp=405 Tdead=66, Tc set to 79.2, aggressive factor of .15 (vs .1, 1, 10)

    #define  DEFAULT_bedKp 10.00

    #define  DEFAULT_bedKi .023

    #define  DEFAULT_bedKd 305.4

  
  

    //120V 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)

    //from pidautotune

    //#define  DEFAULT_bedKp 97.1

    //#define  DEFAULT_bedKi 1.41

    //#define  DEFAULT_bedKd 1675.16

  
  

    // FIND YOUR OWN: "M303 E-1 C8 S90" to run autotune on the bed at 90 degreesC for 8 cycles.

  #endif // PIDTEMPBED

  
  

  // @section extruder

  
  

  // This option prevents extrusion if the temperature is below EXTRUDE_MINTEMP.

  // It also enables the M302 command to set the minimum extrusion temperature

  // or to allow moving the extruder regardless of the hotend temperature.

  // *** IT IS HIGHLY RECOMMENDED TO LEAVE THIS OPTION ENABLED! ***

  #define PREVENT_COLD_EXTRUSION

  #define EXTRUDE_MINTEMP 170

  
  

  // This option prevents a single extrusion longer than EXTRUDE_MAXLENGTH.

  // Note that for Bowden Extruders a too-small value here may prevent loading.

  #define PREVENT_LENGTHY_EXTRUDE

  #define EXTRUDE_MAXLENGTH 200

  
  

  
  

  
  
• Repetier

  January 2018

  That config is not from repetier-firmware, so you are here at the wrong address.