Walchem WebMaster Instruction Manual download pdf (Page 25)

4.2 Display

Turn the power switch on. Be patient, the start up sequence will take about the same time as it

takes a computer to boot up, approximately 2 minutes. At first the display backlight will blink and

all output LEDS will light. Around 30 seconds later, the display backlight will come on, and the

LEDS will shut off. Then the display will come up, and show you the % complete status of the

start up process. After around 1 minute, the Summary Screen will appear. In 15 seconds, you will

hear 3 beeps, and the controller is ready to go.

The Summary Screen will display the sensor inputs (System Conductivity, pH, and ORP if

applicable) and the most significant active alarm. Any additional alarms may be viewed by

pressing the Down Arrow key.

Figure 11: Display

4.3 Keypad

The keypad consists of 4 directional arrow keys (up, down, left and right), 4 menu/function keys

(previous, next, exit and enter), and 4 quick access keys (home, calibrate, relays, and help).

The arrow keys are used to change settings (up and down) and move the cursor to a different

location within that menu in order to change that setting (left and right).

The function keys are used to navigate through the different menu selections. The Next and Prev

keys move you from menu to menu. The Enter key is used to enter a submenu, and to accept a new

setting. The Exit key is used to back up one menu level. No matter where you are in the menus,

pressing Exit enough times will bring you to the Summary Screen.

To change a numeric value, move the cursor to the digit you want to change by pressing the left or

right arrow keys, then use the up or down arrow keys to change the value. Press the Enter key after

all digits have been changed to enter the new value into memory. Similarly, to change an

alphanumeric value, use the up or down arrow keys to change that character, and the left and right

arrow keys to move to the next character. Press the Enter key after all characters have been

changed.

The quick access keys bring you directly to frequently used or critical functions. The Home key

will bring you directly back to the Summary Screen. The CAL key will bring you directly to the

sensor calibration menus. The Relays key will bring you directly to menus that allow you to force

the relays off or on. The Help key is under construction. Refer to Section 5.0 for details on use of

the keypad for sensor calibration, relay control, setting communications parameters, etc.

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Walchem WebMaster Instruction Manual Page 25