2
1 Introduction
As an operator there are generally only a few items of interest as far as operating the Nexus PPC6000. They
are:
x
Setting the system’s operating pressure or temperature.
x
Adjusting the cut in or cut out value.
x
Manually modulating the boiler.
x
Resetting the control after a safety shut down.
x
Finding the Fault that caused the shut down.
All of the other options and adjustments should be done by the combustion technician, as changes to certain parameters could result in an
unsafe operating mode.
2 General
The Nexus display and keypad allows the operator (or combustion technician) access to all set points and
option parameters for commissioning and operating the Nexus PPC6000. The keys are labeled with their
primary function on the key, their secondary function under the key. E.g.: COM/ENTER.
Several levels of passwords protect the integrity of the control. These passwords are numbers entered by
using the up/down arrow keys after pressing the COM (commissioning) key. To enter the password start by
pressing the COM (commissioning) key. You will have 30 seconds to reach the password value and press the
ENTER (COM) key.
3 Password
The only password an operator should require is the “site Passcode.” This can be set as a number from 0-
999. The factory default number is 154. The site Passcode can be changed if desired, however, this requires
the use of a higher-level Passcode.
Warning: Should the Passcode be changed and forgotten, the PPC6000 will have to be reprogrammed
by using the higher-level Passcode. Until then, no adjustments are possible.
Operating Pressure
– PID (set point) 1 or (2)*
* NOTE: ( ) Parentheses indicate set point 2 option parameter. E.g. Day/night.
To set or adjust the boiler’s operating pressure follow steps 1 thru 7:
1. Press
the
COM
key.
2. Use
the
UP
key to raise the value to
154
(or new Site Passcode, if changed).
3. Press
the
ENTER
key. This is the same key as
COM
.
4. If the display shows the angular positions of the servomotors, press the
MODE
key to change to
option parameters. Using the up or down key move to
OPTION 21.1 (22.1)
. This is the control
value the Nexus will modulate the burner to maintain.
5. Use the left or right arrow key to move the cursor to the lower portion of the display, then using the
up/down arrow key change the setting.
6. Press
the
ENTER
key to accept the new set point.
7. To exit and return to the normal run mode, press the
RUN
key followed by the
ENTER
key.
Содержание PPC6000 Series
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