27
The UP and DOWN keys are used to scroll forward and backward through the top layer menu. The
menu is continuous in both directions. That is, when you reach the bottom and continue with the
DOWN key, for example, the very top of the menu will be displayed on the next line. As stated ear-
lier, hitting the HOME key from anywhere will bring you back to the HOME screen. The shaded area
shown in the Top Layer Menu section on page 25 is the HOME screen. For items that contain the >
character, the NEXT key is used to move to a sub menu for that particular item. Also, hitting the
BACK key from a sub menu will bring you back to the line item from the menu you left. To move to
a sub menu or to modify a parameter, that particular line must lie between the > < characters located
on the keypad.
For example, assume you scroll down so the following is displayed:
Since SERVO SETUP is lying between the > < characters of the keypad, you press the NEXT key to
enter the SERVO SETUP sub menu. The shaded area below is an extension of this particular sub
menu:
Pressing the BACK key from anywhere in this sub menu will take you back to the top layer menu at
the place where you exited the top layer menu. Pressing the HOME key will take you back directly to
the HOME screen. For the screen shown above, with DISPLAY FORMAT lying between the > <
characters, pressing the MDFY/SAVE key will allow you to scroll through options to select the
desired value. Pressing the MDFY/SAVE key will save the selected value. Using the DOWN key to
display '
SERVO 1 AIR>
' between the > < characters and pressing NEXT will direct you to the
SERVO 1 sub menu:
PPC4000 CONTROL OPERATION
This next section will be used to set up a basic low pressure steam boiler system with a single fuel.
The application will implement an AIR and GAS servo and use profile 1.
The assumption is made that a BLPS sensor is installed and wired, two appropriately sized FX type
servos are installed and wired and DI 1 (digital input) is used as the burner limit input. The servos are
setup with unique addresses. For this exercise, assume the servo addresses are 1 for AIR and 2 for
GAS. System wiring is done in accordance with Figure 10 (page 70). It is recommended the installer
record the low and high fire positions of the air damper and gas butterfly valve and be generally
knowledgeable about the burner and its operation.
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