Definition Of "P" (Proportional Gain) - Baldor 29M Installation And Operating Manual

Section 1
General Information

Definition of "P" (Proportional gain)

Summing Junction
(error detector)
Error
Signal
Output
Input
e
Command
Feedback
Input
6-2 Manually Tuning the Series 29M Control
Proportional gain is the amplification that is applied to the process error signal, which will
result in a particular control output.
Proportional gain is mathematically defined as;
e
A = K
out p
Where;
A = Control output
out
K = Proportional gain
p
e
= Error signal = (Input Command - feedback)
In Figure 6-2 we see that the amplitude of the output of the control is dependent on the
error, multiplied by the proportional gain.
For a given amount of error, the greater the proportional gain, the greater the output.
It is also true that, for a given amount of proportional gain, the greater the error, the
greater the output.
Figure 6-2
Block Diagram of the P Element
K
out p
Power Input Load Disturbance
Control
Feedback
Measuring
Means
Controlled Variable
Controlled
Variable
Motor
MN1230