Alternate PID Setup

 

The Alternate PID Setup menu option allows for up to 16 sets of PID values to be used on all three loops via the programmer.  PID 1-16 can be loaded via a recipe using the PIDLOAD opcode.  See the opcodes section for more information.

 

This menu option is typically used for vacuum applications with the programmer.

There is a choice of PID 1 – 16, and LP1 Set 1 – LP3 Set 3.

 

NOTE: The feature of PID Auto Switch is disabled for the entire duration of a recipe when the opcode PIDLOAD is executed.  See the PID Loop Setup section for more information.

 

Prop Band (0 for On/Off):

This is the proportional band for the PID setup.  The range of values is –1.0 to 999.0.

 

Reset:

This is the reset value.  This is the reset value.  I = Integral (Reset).  This is the actual temperature being monitored over a period of time and then averaged to keep within the Proportional band. The reset is in repeats per minute. This affects the output of the controller.  It will be proportional to the amount of time the error is present. This helps to eliminate offset.  The range is 0.00 through 10.00.

 

Rate:

This is the rate value.  This is the rate value.  D = Derivative (Rate).  This is the sudden change or rate in the temperature. This rate is in minutes. This affects the controller output which is proportional to the rate of change of the measurement and will control the amount of output by time restraints. Thus derivative takes action to inhibit more rapid changes of the measurement than proportional action. Derivative is often used to avoid overshoot. The range is 0.00 through 10.00.

 

Integral Preset:

This is the integral preset value.  This field provides an offset for the starting point for PID control, also referred to as “Load Line” or “Manual Reset”.  The range is –100 to 100.

 

High Limit:

This is the high limit value.  The range is –100 to 100.

 

Low Limit:

This is the low limit value.  The range is –100 to 100.