Performing Manual Control; Manual Mv - Omron E5GC User Manual

5 Advanced Operations

5-12 Performing Manual Control

You can perform manual operation with PID control or with a Position-proportional Model.

5-12-1 Manual MV

Standard Models and Position-proportional Models (Close Control with Direct
Setting of Position Proportional MV Parameter Set to ON)
If you change to Manual Mode, the Manual MV parameter will be displayed and the displayed value
will be output as the MV. If you change the setting of the Manual MV parameter, you can set any
required MV. (The new value will be applied immediately.) The default setting of the Manual MV
parameter is determined by the setting of the Manual Output Method parameter as shown below.
HOLD: The MV from immediately before moving to Manual Mode
INIT: The set value of the Manual MV Initial Value parameter
If the power supply is cycled during manual operation, operation will be restarted with the manual
MV that was in effect before the power supply was interrupted. When the Manual MV Limit Enable
parameter is set to ON (enable), the setting range will be from the MV lower limit to the MV upper
limit. When operation is changed back to Automatic Mode, the MV from immediately before the
change is inherited and then gradually changes to the value for Automatic Mode to prevent the MV
from changing rapidly. (This is called balanceless-bumpless operation.)
The manual operation is illustrated in the following figure when the Manual Output Method
parameter is set to HOLD.
For a Position-proportional Model, the manual MV changes as shown below when there is a
potentiometer input error.
Manual MV Limit Enable Parameter Set to OFF
Manual MV ≥ 100: Open output turns ON.
Manual MV ≤ 0: Close output turns ON.
For any other manual MV, both the open output and close output will turn OFF.
Manual MV Limit Enable Parameter Set to ON
Manual MV = MV upper limit: Open output turns ON.
Manual MV = MV lower limit: Close output turns ON.
For any other manual MV, both the open output and close output will turn OFF.
Position-proportional Models (Floating Control or Direct Setting of Position
Proportional MV Parameter Set to OFF)
Press the Up Key to turn ON the open output. Press the Down Key to turn ON the close output. For
close control, you can also use a manual MV limit. In this case, the MV limit operates for the valve
opening.
5 - 32
MV (%)
Balanceless-bumpless
0
MV switched
Manual
Automatic
Time
OFF ON
Power
interrupted
E5@C Digital Temperature Controllers User's Manual (H174)