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.

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.

 

Prop Band (0 for On/Off)

This is the proportional band field. This represents the P in PID. P = Proportional. This is a field in which you want the process variable to stay around the setpoint.  Clicking on the value will allow the user to change the value.  The range of values is –1.0 to 999.0.

 

Reset

This is the reset field. This represents the I in PID. I = Integral.  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 helps to eliminate offset.  The range is 0.00 through 10.00.

 

Rate

This is the rate field. This represents the D in PID. D = Derivative.  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 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.