Full Gauge Controls FG-HMI 4.3 User Manual

Hysteresis
Setpoint
Time
Suction pressure
Proportional + Integral Control
Proportional-only control
Hysteresis
Setpoint
Suction pressure
Hysteresis
Setpoint
Time
Suction pressure
Time
14.SUCTION CONTROLS
14.4.6 Integral action:
In some systems, the control of compressors with only proportional action (Setpoint and hysteresis) tends to present an error in steady state (not
reaching the setpoint) or to show oscillatory behavior (excessive pressure variation around the setpoint and high number of compressor start).
In these cases, the use of integral action together with proportional control has the objective of keeping the control pressure stable, converging to values
close to the setpoint.
Application example:
The integral action can be used in all control modes, including those that operate only on the On/Off outputs. To activate the integral action, simply set a
value other than Off in the parameter Integral time (1.2.x.9).
The higher the configured value, the slower and more stable the system’s behavior.
The lower the configured value, the faster and more oscillatory the behavior is.
Note: The definition of this parameter depends on the capacity of the system and the response speed of its pressure fluctuations. It is
suggested to start the tests to define this parameter using the value of 330 seconds.
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Full Gauge Controls FG-HMI 4.3 Specifications

General

Brand	Full Gauge Controls
Model	FG-HMI 4.3
Category	Controller
Language	English