Revert "Testing Fix for Arduino 1.6+ compiler issue #1523"

This reverts commit fb75a9272d.

Marlin/Configuration.h

@@ -215,7 +215,7 @@ Here are some standard links for getting your machine calibrated:
 // 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 PIDTEMPBED
 //
 //#define BED_LIMIT_SWITCHING
 
@@ -226,10 +226,17 @@ Here are some standard links for getting your machine calibrated:
 #define MAX_BED_POWER 255 // limits duty cycle to bed; 255=full current
 
 #ifdef PIDTEMPBED
-// Felix Foil Heater
+//120v 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
-   #define DEFAULT_bedKp 103.37
+//from FOPDT model - kp=.39 Tp=405 Tdead=66, Tc set to 79.2, aggressive factor of .15 (vs .1, 1, 10)
-   #define DEFAULT_bedKi 2.79
+    #define  DEFAULT_bedKp 10.00
-   #define DEFAULT_bedKd 956.94
+    #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
@@ -273,15 +280,15 @@ your extruder heater takes 2 minutes to hit the target on heating.
 // uncomment the 2 defines below:
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 60 //in seconds
+//#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 5 // in degree Celsius
+//#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
 // If you want to enable this feature for your bed heater,
 // uncomment the 2 defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 30 //in seconds
+//#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 5// in degree Celsius
+//#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 
 //===========================================================================

Marlin/temperature.cpp

@@ -527,13 +527,12 @@ void manage_heater()
           dTerm[e] = (PID_PARAM(Kd,e) * (pid_input - temp_dState[e]))*K2 + (K1 * dTerm[e]);
           pid_output = pTerm[e] + iTerm[e] - dTerm[e];
           if (pid_output > PID_MAX) {
-            if (pid_error[e] > 0 )  temp_iState[e] -= pid_error[e];
+            if (pid_error[e] > 0 )  temp_iState[e] -= pid_error[e]; // conditional un-integration
             pid_output=PID_MAX;
           } else if (pid_output < 0){
-            if (pid_error[e] < 0 )  temp_iState[e] -= pid_error[e];
+            if (pid_error[e] < 0 )  temp_iState[e] -= pid_error[e]; // conditional un-integration
             pid_output=0;
           }
-
         }
         temp_dState[e] = pid_input;
     #else