Pid / Auto-Tune; Table 2.1 Pid Constant Values - ILX Lightwave LDT-5900 Series User Manual

2
C H A P T E R

PID / AUTO-TUNE

Selecting this parameter allows access to the Auto-Tune feature and to view or
modify the PID constants.
The Auto-Tune feature and user modification of the PID constants are only
available in constant temperature (T) and constant sensor (R
(See the Mode Section later in this chapter for details on selecting the control
mode.) The PID constants are not used in any of the other control modes.
Background
Tuning the temperature controller means setting the proportional, integral and
derivative terms for the best control for a particular system or process.
The P, I, and D terms are defined as follows:
P = The proportional constant, which controls the loop gain
I = The integral constant, which offsets errors and affects settling time
D = The derivative constant, which affects the damping rate
The range of acceptable PID values are shown in the table below.

Table 2.1 PID Constant Values

Parameter
Proportional
Integral
Derivative
The LDT-5900 Series Temperature Controllers have an auto-tune algorithm that
will help the user determine nominal values for the PID coefficients. While the
auto-tuned values typically provide acceptable stability and overshoot for a given
thermal system, these values can usually be optimized through further user
tuning, as described later in this section.
22
LDT-5980/ 5948
O P E R A T I O N S
Front Pa nel Opera t ion
Range
0 - 9999.99
0 - 999.999
0 - 999.999
Default
20.0
0.8
1.0
) control modes.
SNSR