Omron E5*C Series User Manual

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5 Advanced Operations
E5@C-T Digital Temperature Controllers User’s Manual (H185)
5-21 Controlling Valves (Can Be Used with a Position-proportional Model)
5
5-21 Controlling Valves (Can Be Used with
a Position-proportional Model)
You can use position-proportional control to control a value with a control motor. With position-propor-
tional control, you can use either close control or floating control.
Precautions for Correct Use
The following functions cannot be used with position-proportional control.
• ON/OFF control
• P and PD control during floating control
• 40% AT during floating control
• LBA
• HB and HS alarms
z Control Method
z Motor Calibration and Valve Opening Monitor
The valve position is calibrated and the travel time from completely open to completely closed is set
automatically. You can then check the valve opening with the Valve Opening Monitor parameter. If
you set the Motor Calibration parameter to ON, the valve will open completely and close completely,
and then the setting of the parameter will change to OFF when the measurement has been
completed. The open/closed position counts in the measurement results are set in the Valve
Completely Open Position and Valve Completely Closed Position parameters and the potentiometer
resistance range is set in the Potentiometer Specification Setting parameter. “ERR” will be displayed
if any of the following errors occurs during execution. If an error occurs, check the wiring and other
factors and execute motor calibration again.
• The potentiometer input value does not change or changes backward between completely
open and completely closed because the wiring is wrong.
• The value of the potentiometer input is incorrect because of a broken wire, noise, or other
factor.
Note: Do not change to any other parameter during calibration.
z Travel Time
The Travel Time parameter is set to the time from when the valve is completely open until it is
completely closed. The Travel Time parameter is set automatically when motor calibration is
performed.
Note: You cannot monitor the valve opening simply by setting the Travel Time parameter. To monitor the valve
opening, always perform motor calibration.
Close control
A potentiometer is connected and the valve opening and travel time are used to control
valve operation. Always perform motor calibration before actual operation.
Floating control
Valve operation is controlled without a potentiometer by estimating the valve opening
from the travel time. Always set the travel time before actual operation. To monitor the
valve opening, connect a potentiometer and perform motor calibration.
Input contacts Status
OFF Wait operation disabled.
ON Wait operation enabled.

Omron E5*C Series Specifications

General

Brand	Omron
Model	E5*C Series
Category	Controller
Language	English