DE-18 USER MANUAL SECTION 5
52
5.1 DESCRIPTION
The control system consists of a Murphy EMS 547
engine controller and an MDDM that receives data
from a CAT diesel engine, The panel also includes
analog gauges for voltage, and fuel level The system
is powered by the main 24VDC battery. The
controller will enable outputs at the appropriate times
for starting, running, stopping and controlling the
speed based on the discharge pressure.
5.2 FEATURES:
Refer to Figure 5-1 for identifying the following
features, which are located on the control panel.
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.
MDDM
The MDDM is the primary interface between the
EMS 547 and the engine ECM, and has the following
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.
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 150 psig.
Decrease Pressure· Used to decrease the package
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
condition.
E·Stop- Used to immediately shut down the
compressor 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 shutdown will be
displayed on the EMS.
ANALOG GAUGES
Voltage- Indicates battery voltage
Fuel- Indicates the fuel level in the lank.
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
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:
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