Keypad; Access Code; Startup - Walchem WDP420 Instruction Manual

4.3

Keypad

The keypad consists of 4 directional arrow keys and 4 function keys. The arrows are used to move the
adjustment cursor and change settings, while the function keys are used to enter values, and navigate the
various menu screens. The function keys are ENTER, EXIT, NEXT, and PREV (previous). NEXT and
PREV scroll through the various menu choices. ENTER is used to enter a submenu and to enter a
value. EXIT is used to back up one menu level. If you are at the main menu level, EXIT will return you
to the Summary Display.
To change a value in a submenu, the left/right arrow keys move the cursor left and right to each digit or
option that can be changed. The up/down arrows will change numeric values up or down, or scroll
through option choices. Press ENTER only when you have finished making all of the changes for that
menu screen.
4.4

Access Code

The WPH series controller is shipped with the access code disabled. If you wish to enable it, see
Section 5.9 for operation. With the access code enabled, any user can view parameter settings, but not
change them. Note that this provides protection only against casual tampering. Use a lock on the cover
latch if you need more protection.
4.5

Startup

Initial Startup
After having mounted the enclosure and wired the unit, the controller is ready to be started.
Plug in the controller and turn on the power switch to supply power to the unit. The display will briefly
show the model number and then revert to the normal summary display. Scroll through the menus and
calibrate the pH/ORP reading, optional temperature, and set the control parameters detailed in Section
5, Operation.
To return to the summary display, press the EXIT key until you return to this screen. The controller will
automatically return to this screen after 10 minutes.
S S
Normal
7.0 pH
Normal
Figure 6 Summary Screens
10.00
10.00 pH
19