Omron E5DC User Manual

5 - 63
5 Advanced Operations
E5@C Digital Temperature Controllers User’s Manual (H174)
5-21 Controlling Valves (Can Be Used with a Position-proportional Model)
5
*1 For close control, you can select only the measured opening. For floating control, you can select either the
measured opening or the estimated opening.
*2 The estimated valve opening will be different from the actual opening. Use the measured opening to check
the actual valve opening.
 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: With the E5EC/E5AC-PR@-0@@, you cannot monitor the valve opening simply by setting the Travel Time
parameter. To monitor the valve opening, always perform motor calibration.
 Position Proportional Dead Band and Open/Close Hysteresis
When the difference between the MV and the valve opening is within the value that is set for the
Position Proportional Dead Band, opening or closing the valve will be stopped to prevent the valve
from deteriorating. The Open/Close Hysteresis parameter is used to offset the ON and OFF points
when opening and closing the valve. Refer to the following figure for details.
 PV Dead Band
When the PV enters the PV dead band, any unnecessary output is stopped to prevent the valve
from deteriorating.
Estimated opening
The valve opening estimated by the Digital Controller is displayed. To monitor the
estimated opening of the valve, select the estimated opening for the Valve Opening
Monitor Selection parameter and set the travel time.
Application: Use this setting when a potentiometer is not connected and you want to
display an approximate opening.
*1 After the power supply is turned ON, the Valve Opening Monitor will start at 0%.
*2 The estimated valve opening will not agree with the actual valve opening. If you
want to temporarily align the estimated opening with the actual opening, used the
following operation.
In Manual Mode, turn ON the close output by pressing the DOWN Key for at least
the time set for the travel time. (Refer to 5-12 Performing Manual Control for the
method to change to the Manual Control Level.)
0
Position Proportional
Dead Band
−100%
OFF
ON
100%
MV − Valve opening
Open/Close Hysteresis
SP
PV
Unnecessary output is
stopped in this range.
PV Dead Band

Omron E5DC Specifications

General

Brand	Omron
Model	E5DC
Category	Temperature Controller
Language	English