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5.0 START-UP AND CONTROL PANEL
5.3.1.4 SET MENU:
In this menu, the current set points in chiller mode (parameter code
Q001
) can be displayed and edited.
The user cannot set the set points outside of the minimum and maximum values set in the Plant menu.
Changing the set point (water inlet temperature)
The following table gives a brief description of the procedure to follow in order to change the set point for the water going into the chiller. The
set point fixed in the factory is +7.0°C; the range of possible values is +5 / +15°C.
Changing the set point
Starting from a situation in which electrical voltage
has been supplied to the chiller and the software is
loaded, we find ourselves on the main menu of the
microprocessor.
Using the UP and DOWN keys, go to the main screen
to display the
“Set”
symbol (as shown in the figure at
the side) and press ENTER.
Now we find ourselves on the Set point submenu
where it is possible to display and change the value.
By pressing ENTER, the cursor is positioned at the side
of the set point value.
Now it is possible to change the set point value using
the UP and DOWN keys.
On reaching the desired number, it is necessary to
press ENTER to memorise the set point value that we
have changed.
To return to the main menu simply press ESC
Temperature control
The
“Ekapt”
software, installed on the chiller of the EKS series, allows the control of the water input or output temperature for the unit.
PID control
There are two types of PID control:
-
PID control on startup
-
PID control during operation
The startup control must prevent an excess of requested power. Since at startup the status of the load is not known but only the temperature
is, the power must be entered little by little, waiting for the reaction of the system.
The control during operation must be quick in order to follow any load variations and maintain the output water temperature as close to the
setpoint value as possible.
