7.4
PI relay proportional gain
Display:
A
x.
PG
Range:
-32.767
to
32.767
Default Value:
0.010
Note: the range value may be restricted if the number of display digits does not allow viewing of
the full range.
The proportional value will determine the degree to which the controller will respond when there
is a difference (error) between the measured value and the process setpoint. If the proportional
gain is increased then for a given error the relay on time will be increased (or decreased if the
error is on the other side of the setpoint). The proportional gain action can be reversed by setting
a negative gain i.e. with a negative gain the on time will reduce as the error increases. With a
proportional gain of
1.000
and an error of
10
or more (with control span set at
10
) the controller
will increase the frequency by 100% if possible. With a proportional gain of
0.500
an error of
10
or more (with control span set at
10
) will cause the controller to increase the frequency by 50%,
if possible. Too much proportional gain will result in instability due to excessive overshoot of the
setpoint. Too little proportional gain will lead to a slow response.
Proportional gain
too high
Proportional gain
too low
Ideal
SETPOINT
PROCESS
TIME
36 of
RM4AVMAN-2.1-0
