About Tuning
Model 493.02 Controller Service
Tuning
199
How the Tuning Controls Work
The controller system software includes five tuning controls. You do
not need to use all of the controls to properly tune your system. In
fact, most testing can be accomplished with just the proportional gain
adjustment. The other adjustments introduce a signal to the command
to compensate for specific situations.
Note Throughout this chapter the terms gain, reset, and rate represent
proportional gain, reset integration, and rate derivative respectively.
The five available gain controls have the following functions:
• Proportional gain (P Gain) increases system response.
• Integral gain (I Gain) increases system accuracy during static or
low-frequency operation and maintains the mean level at high
frequency operation.
• Derivative gain (D Gain) improves the dynamic stability when
high proportional gain is applied.
• Feed forward gain (F Gain) increases system accuracy during
high-frequency operation.
Changing adjustment
ranges
For automated systems, It is possible that the amount of adjustment for
a control is too coarse or inadequate. Click the adjustment button
(such as P Gain) and use the Range Select window to change the
range of the adjustment. Reducing the range produces smaller steps
between values (higher resolution) while increasing the range
produces larger steps between values.
Example: Suppose the default range for the Proportional Gain
adjustment is 50. Assume you are adjusting the gain and you reach the
maximum adjustment (50). Clicking the P Gain slider label displays the
P Gain range window where you can change the range of the
adjustment. Change the range by typing a new value in the maximum
entry field.
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