To prevent sudden changes in the manipulated variable when switching between
manual and auto operation, operation is resumed using the value that was active
immediately before operation was switched, and the value is brought gradually
closer to the value immediately after operation was switched.
Balance-less,
Bump-less Opera-
tion
CHAPTER 3 BASIC OPERATION
E5AK
3--14
3.7 Adjusting Control Operation
·
You can change the set point in the “set point” parameter (level 0 mode).
·
However, note that you cannot change the set point when the “security”
parameter (protect mode) is set to “6”.
·
To change the set point, press the
or
keys to select the desired
value. If you leave the setting for two seconds, the set point is updated
to the new setting.
In the following example, let’s change the temperature set point from
“60
_
C” to “50
_
C”.
(1) Select the PV/SP monitor display.
(2) Press the
key to change the setting to “50.0: 50.0
_
C”.
·
On standard type controller, the manipulated variable is controlled, and
on a position-proportional type controller, the valve opening is con-
trolled.
·
To set manual operation and manually set the manipulated variable or
the valve opening, press for 1 second minimum the
A/M
key. The control-
ler enters the manual mode.
·
The process value is displayed on the No.1 display, and the manipulated
variable is displayed on the No.2 display. The manipulated variable
(heat) is also displayed on the bar graph in 10% increments.
·
To change the manipulated variable, press the
or
keys. After
two seconds, the manipulated variable is updated to the new setting.
·
Other modes cannot be selected while in the manual mode. To select
other modes, press for 1 second minimum the
A/M
key. The manual mode
is quit.
·
The automatic return of display function does not work while in the
manual mode.
·
When switching between manual and auto operation, the manipulated
variable is subject to balance-less, bump-less operation.
·
If the power is interrupted during manual operation, manual operation
is resumed at the manipulated variable at power interruption when the
power is reset.
·
You can switch the AUTO/MANUAL function up to 100,000 times.
J
Changing the set
point
Setting Example
J
Manual operation
F
Standard type
Process value
Manipulated
variable
[MANU] LED
Bar graph