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5.1 DESCRIPTION
The control system consists of a Murphy EMS 547
engine controller and an MDDM that receives data
from a CAT 3456E diesel engine. The panel also
includes analog gauges for voltage, and fuel level.
The system is powered by the main 24V DC battery.
The controller will enable outputs at the appropriate
times for starting, running, stopping and controlling
the speed as measured by the discharge pressure.
FEATURES:
Refer to
Figure 5-1
for identifying the following fea-
tures, which are located on the control panel.
5.2.1 EMS 547
The EMS 547 contains the following keys:
Enter- Used to enter the "PROGRAM SELECT
MODE" by entering a code number, which provides
access to examine and change certain set points.
Refer to the controller sequence of operation for
details.
Up Arrow- Used to scroll through the display in an
ascending order and in parameter set point change
mode to increment a value.
Down Arrow- Used to scroll through the display in
a descending order and in parameter set point
change mode to increment a value.
5.2.2 MDDM
The MDDM is the primary interface between the
EMS 547 and the engine ECM, and has the follow-
ing features:
Up Arrow- Used to scroll through the display in an
ascending order.
Down Arrow- Used to scroll through the display in
a descending order.
5.2.3 BUTTONS/INDICATORS
CONTROL PANEL
The control panel contains six buttons as follows:
Increase Pressure- Used to increase the package
operating pressure set point. This parameter can
be set to a maximum pressure of 135 psig.
Decrease Pressure- Used to decrease the pack-
age operating pressure set point. This parameter
can be set to a minimum pressure of 70 psig.
Start- Used to start the compressor package.
Stop- used to stop the compressor package.
Reset- Used to clear a warning or shutdown condi-
tion.
E-Stop- Used to immediately shut down the com-
pressor package. A second E-Stop button, which
serves the same function, is located on the outside
of the package.
LAMP INDICATORS
Embedded into the front of the panel are four
lamps. Each lamp has the following purpose:
Engine Warning- The yellow light will flash a code
to annunciate a violation of an engine warning set
point. A decal describing these codes is attached to
the panel door. For additional code description,
refer to the Engine Operator's Manual.
Engine Shutdown- The red light will flash a code
to annunciate a violation of an engine shut down set
point. A decal describing these codes is attached to
the panel door. For additional code description,
refer to the Engine Operator's Manual.
Compressor Warning- The yellow light will turn on
to annunciate a violation of a compressor warning
set point. A message describing the warning will be
displayed on the EMS.
Compressor Shutdown- The red light will turn on
to annunciate a violation of a compressor shut
down set point. A message describing the shut-
down will be displayed on the EMS.
ANALOG GAUGES
Voltage- Indicates battery voltage
Fuel- Indicates the fuel level in the tank. The tank
capacity is 245 gallons.
5.2.4 CONNECTORS
Two 3-pin connectors located on the front of the
panel can be used for sequencing multiple unit
operation.
5.3 PARAMETER/ STATUS DISPLAY
5.3.1 EMS 547
PARAMETER
By default the actual line pressure (P2) and the set
point pressure will be displayed. Other parameters
can be viewed by pressing the "UP" or "DOWN"
arrows. The following parameters can be viewed:
·Interstage Pressure, P1 xxx psi
·Discharge Pressure, P2 xxx psi
·Oil Filter Discharge Pressure, P3 xxx psi
·Oil Filter Inlet Pressure, P4 xxx psi
·Oil Filter Differential Pressure, P4-P3 xxx psid
·1st Stage Discharge Temperature, T1 xxx°F
·Second Stage Discharge Temperature, T2 xxx °F
·Oil Temperature at Bearing Manifold, T3 xxx °F
·Second Stage Inlet Temperature, T4 xxx °F
·Package Discharge Temperature, T5 xxx °F
Section 5
CONTROLLER
21
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