Rockwell Automation 1771-TCM,D17716.5.108 TEMPERATURE CONTROL MOD - Manual (Page 40)

Setting Gains
Chapter 5
5-2
After auto-tuning, you may want to fine-tune the loops. As you fine-tune a
loop, first try adjusting the proportional gain; this will have the greatest
impact. Your second choice for adjustment should be the integral gain.
The derivative gain should be the last choice for fine-tuning a loop.
If the loop has a problem over-shooting the set point, you may be able to
improve the loop response by doing one or more of the following (in order
of effectiveness):
1. decrease the proportional gain
2. decrease the integral gain
3. increase the derivative gain
If the loop is slow in reaching the set point, you may be able to improve
the loop response by doing one or more of the following (in order of
effectiveness):
1. increase the proportional gain
2. increase the integral gain
3. decrease the derivative gain
The first word of each gains block contains a block identification code (10
1000 1000 0000 1001 or 8809
16
) that you use to tell the module that it is a
gains block.
For each gain value, you enter a 16-bit integer value. However, as you
enter each gain value you must be aware of an inferred decimal point.
For each proportional gain, the inferred decimal point is 2 places from
the right (causing the resolution to be 0.01).
For each integral gain, the inferred decimal point is 4 places from the
right (causing the resolution to be 0.0001).
For each derivative gain, the inferred decimal point is 1 place from the
right (causing the resolution to be 0.1).
FineĆtuning the Loops
Set Point
Set Point
Block Identification
Inferred Decimal Point