be impossible for you to start your troubleshooting
maintenance of the PACC and PCC is your
efforts without referring to the technical manual.
responsibility.
To use the technical manual correctly, however, you
PACC and PCC Testing
must first know what particular major circuit function is
affected. A major circuit function area is a collection of
circuits that are designed to achieve a certain function,
Daily testing of the PACC and PCC is normally
such as starting a GTM, monitoring start air valve status,
performed by the console operator. On the PACC on
and so forth. Examples of major function areas in the
DD-, DDG-, and CG-class ships, the daily tests consist
PACC and PCC are as follows:
of a audible test of the bell, horn, and siren. An audible
test of the buzzer is included on the PACC on the
Main reduction gear (MRG) monitoring and
DDG-51 class ship. The PACC and the PCC have lamp
control circuits
test circuits for testing the indicator lamps and LEDs.
CRP/CPP monitoring and control circuits
You will use the audible alarm tests to make sure the
audible alarm circuits are functioning properly. To start
Fuel oil service monitoring and control circuits
these tests, depress the appropriate test push button on
Lube oil service monitoring and control circuits
the PACC. This action will cause each audible alarm
circuit to sound an audible alarm.
Gas turbine module (GTM) monitoring and
control circuits
The lamp test is conducted by depressing a LAMP
TEST push button or activating the STATUS/ALARM
Air control and monitoring circuits
switch on the PACC or PCC. This action will cause all
Recognizing and understanding the major function
t h e alarm and status lights to illuminate on the
areas of the PACC and PCC will ease your maintenance
designated section, allowing you to locate the burned
and troubleshooting efforts.
out lamps on the console.
ELECTRIC PLANT CONTROL CONSOLE
PACC and PCC Maintenance
The electric plant control console (EPCC) is located
The PACC and PCC are complex electronic
in the CCS of DD-963, DDG-993, DDG-51, CG-47, and
components. However, the basic troubleshooting and
FFG-7 class ships. This console provides the operator
maintenance procedures used throughout your rating
w i t h automatic and manual controls, displays of
will still apply. Control and other electronic circuitry is
performance parameters, status indications, and alarm
packaged on circuit card assemblies located in card
indications for remote operation of the ship's electric
racks inside the consoles. Each circuit card is assigned
plant. Controls are provided for generator start/stop,
its own designation to ease troubleshooting. The PACC
and PCC also contain power distribution circuits and
functions, and circuit breaker close/trip functions. Logic
fuses.
is provided for continuous monitoring of the electric
Some of the maintenance required on the PACC or
plant operating configuration and supplying electric
PCC will stem from the failure of one of the tests we
plant status information. The EPCC is continuously
have just described. If an indicator fails to light, you
monitored while the ship is underway. Any malfunction
must find the cause of the failure. Most problems that
of the console is immediately noticed. As a GSE,
occur to the PACC or PCC will happen during normal
maintenance of the EPCC is also your responsibility.
o p e r a t i o n of the engineering plant. Imagine, for
example, that during a GTE start, the main fuel valve
EPCC Testing
fails to open. You, as the GSE, are called to investigate
t h i s problem. Always remember to refer to the
Daily testing of the EPCC is normally performed by
manufacturer's technical manual when you are planning
the console operator. The EPCC logic on some ships
to perform maintenance on the PACC and PCC.
performs self tests at set intervals. The daily tests on the
EPCC consist of a lamp test and an audible alarm test.
When a problem or fault occurs in the PACC or the
PCC, you must know where to start troubleshooting.
On the EPCC on DD-963, DDG-993, and CG-47 class
ships, the audible alarm test consists of a test of the horn
Using the technical manuals is essential in this step. The
PACC and PCC contain so many circuits that it would
and the siren. On the EPCC on the FFG-7 class ships,
5-48