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@ -399,23 +399,30 @@ |
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//===========================================================================
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//============================= PID > Bed Temperature Control ===============
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//===========================================================================
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// Select PID or bang-bang with PIDTEMPBED. If bang-bang, BED_LIMIT_SWITCHING will enable hysteresis
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//
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// Uncomment this to enable PID on the bed. It uses the same frequency PWM as the extruder.
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// If your PID_dT is the default, and correct for your hardware/configuration, that means 7.689Hz,
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// which is fine for driving a square wave into a resistive load and does not significantly impact you FET heating.
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// This also works fine on a Fotek SSR-10DA Solid State Relay into a 250W heater.
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// If your configuration is significantly different than this and you don't understand the issues involved, you probably
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// shouldn't use bed PID until someone else verifies your hardware works.
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// If this is enabled, find your own PID constants below.
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/**
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* PID Bed Heating |
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* |
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* If this option is enabled set PID constants below. |
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* If this option is disabled, bang-bang will be used and BED_LIMIT_SWITCHING will enable hysteresis. |
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* |
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* The PID frequency will be the same as the extruder PWM. |
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* If PID_dT is the default, and correct for the hardware/configuration, that means 7.689Hz, |
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* which is fine for driving a square wave into a resistive load and does not significantly |
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* impact FET heating. This also works fine on a Fotek SSR-10DA Solid State Relay into a 250W |
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* heater. If your configuration is significantly different than this and you don't understand |
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* the issues involved, don't use bed PID until someone else verifies that your hardware works. |
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*/ |
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//#define PIDTEMPBED
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//#define BED_LIMIT_SWITCHING
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// This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
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// all forms of bed control obey this (PID, bang-bang, bang-bang with hysteresis)
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// setting this to anything other than 255 enables a form of PWM to the bed just like HEATER_BED_DUTY_CYCLE_DIVIDER did,
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// so you shouldn't use it unless you are OK with PWM on your bed. (see the comment on enabling PIDTEMPBED)
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/**
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* Max Bed Power |
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* Applies to all forms of bed control (PID, bang-bang, and bang-bang with hysteresis). |
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* When set to any value below 255, enables a form of PWM to the bed that acts like a divider |
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* so don't use it unless you are OK with PWM on your bed. (See the comment on enabling PIDTEMPBED) |
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*/ |
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#define MAX_BED_POWER 175 // limits duty cycle to bed; 255=full current
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// This limit is set to 175 by default in the Makibox configuration and it can be adjusted
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// to increase the heatup rate. However, if changed, be aware of the safety concerns of
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