OMRON Sysdrive 3G3HV - Detector Cooling Section

PID Control
PID (proportional, integral, and differential) control is a method to control a mechanical
system by making the feedback values obtained from the mechanical
system agree with the set point that has been preset.
This method makes it possible to control a mechanical system that has dead
time.
The Inverter is not suitable for PID control that requires a response time of 50 ms
or less.
Refer to the following for examples of PID control that can be performed by the
Inverter as well as the operation of PID control in detail and the settings and adjustments
of the parameters.
Examples of PID Control
Refer to the following for examples of PID control that can be performed
by the Inverter.
Application Control Required sensor
Speed control The Inverter uses the feedback of speed data of the Tachometric generator
mechanical system and makes the operation speed
of the mechanical system agree with the set point.
The Inverter controls the mechanical system in
synchronization with another mechanical system that
inputs its speed data as the set point to the Inverter.
Pressure control The Inverter performs constant pressure control with Pressure sensor
the feedback of pressure data.
Flow control The Inverter performs flow control with the feedback Flow sensor
of flow data.
Temperature
control
The Inverter performs temperature control using fans
with the feedback of temperature data.
Thermocouple
Thermistor
PID Control Operation
The following graph shows control output (output frequency) changes
with a constant deviation (i.e., the difference between the set point and
feedback is constant).
Deviation
Time
Control
output
Differential
control
PID control
Integral control
Proportional control
Time
Proportional Control
Control output in proportion to the deviation is obtained through proportional control. Proportional
control alone cannot make the deviation zero.