Nor-Cal LCD Front Panel Interface - Manual (Page 3)

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10.1 Commonly Used Function Buttons
Navigating through the various menus of the front panel LCD interface, the user will find that some functions and associated buttons are used in more than one
place. This includes the SAVE, SET VALUE, BACK SPACE, CLEAR, BACK and EXIT functions.
The SAVE function is generally found on set-up type screens. This button must be pressed before exiting to another page allowing the set-up information to be
stored in NVRAM. Exiting without pressing SAVE will result in the old information being used.
The SET VALUE function is used on pages where numerical information is entered. Similar to the SAVE function, the SET VALUE button has to be pressed in
order for the new number to be stored in NVRAM.
The BACK SPACE button is also found on pages where numerical information is entered. Pressing the BACK SPACE button simply erases the last digit entered.
For example, if the numbers 1 2 3 were entered and then the BACK SPACE button was pressed, then the numbers 1 2 remain on the command line.
On a parallel path, the CLEAR function will erase the entire numerical entry on the screen. So, if the numbers 1 2 3 were entered followed by the CLEAR button
being pressed, then no numbers would be left on the command line.
The BACK button is used to go back to the previous screen.
The EXIT button is used to go all the way back to the MAIN MENU screen.
10.2 Basic Operation
Once the APC is first powered on the NOR-CAL LOGO page will come on for approximately three seconds. At
the same time, the valve initialization routine will commence if the controller is connected to a butterfly valve.
Controllers that are connected to a gate- or pendulum valve will remain in a “safe mode” which effectively
delays the valve initialization until the operator gives a “clear to proceed” command. If the NOR-CAL LOGO
screen is touched during the first three seconds, an LCD SET-UP page will appear.
The LCD SET-UP page allows the user to:
a) change the screen contrast by sliding the CONTRAST bar left or right. Be careful not to set too little or too
much contrast, as screen legibility may be compromised to the point where no information can be seen.
b) turn on or off the BACK LIGHT. Operating the screen with the BACKLIGHT off may extend its useful life.
c) perform an LCD screen X-Y calibration, as needed. This function essentially correlates the position of graphics
information to physical position on the touch screen matrix. A calibration is done on each front panel display by
Nor-Cal Products before shipment, and recalibration by the customer may seldom or never be required.
Once all LCD screen settings are adjusted appropriately, press SAVE to store the information in memory followed by EXIT to return to the MAIN MENU page.
The MAIN MENU page simply serves as a central node used in navigation to the various sub menu pages.
From this screen, the user can access sub-menus that are used:
a) to configure set-point parameters such as value, type and certain tuning parameters
b) to perform utility functions such as valve initialization, controller reset and LCD set-up
c) to configure engineering units for pressure and valve position, and
d) in the active control mode of the controller and valve system
The MAIN MENU also displays real time values for both pressure and valve position, and is therefore
intended to be the page that is displayed whenever the controller is in normal operation mode.