MGC-96079B
Revised 08-02
Catalog Section 75
(00-02-0766)
Digital Generator Panels
MGC447 and MGC547 Series
■
Microprocessor-Based Controller
■
Digital Engine and Generator Display
■
Pre-Programmed, Full Featured
■
Built-In Advanced Communications
■
Compact Design, NEMA 1 Drip Proof
FW
Murphy
Description
The MGC447 and MGC547 generator panels
provide inexpensive engine and generator
monitoring and control with digital accuracy.
These microprocessor-based controllers
include all basic industry requirements plus
many value added features such as: remote
communications and control capabilities; on-
board real time clock; shutdown history dis-
play of last 5 shutdowns; service reminders.
Operating parameters are configured through
a three-button interface. Data is displayed on a
32-character, back lit alphanumeric liquid
crystal display. Access to the system memory
is controlled by entry codes, and the program
is stored in EPROM.
These panels accept a variety of sensor inputs
such as from Murphy electric gage type resis-
tive sending units and digital inputs such as
from SWICHGAGE
®
instruments.
The MGC447 and MGC547 feature open col-
lector transistor type and relay type outputs.
These compact panels measure only 13-1/4 x
8-1/2 x 12-1/2 inches (337 x 216 x 318 mm), and
are shock mounted and rated NEMA 1 drip-proof.
The MGC547 Series models incorporate built-
in serial ports for advanced communication
capabilities. They can communicate with
remote terminals, such as a computer via
modem or can automatically dial your pager to
inform you of the status of the generator.
The user is able to start or stop the engine, view
operating parameters and reset or acknowledge
abnormal conditions from a computer.
Features
•
Pre-programmed generator panels for typical
gen-set operations: warm-up, transfer to
load, run time, engine unload, cooldown.
•
For 3-phase, 4-wire or 1-phase, 3-wire generators.
•
Digital readout of all engine and generator
functions: pressure, temperature, rpm, amps
and volts. Monitored with first-out shutdown
annunciation.
•
Built-in communication for remote start/stop
and monitoring engine and generator func-
tions (MGC547 models).
•
Optically-isolated noise resistant inputs.
•
Open collector transistor outputs.
•
Crank and Rest cycle timers, 1 to 300 seconds
each (adjustable).
•
Shutdown time delay, 2 to 2000 seconds
(adjustable), locks out low oil pressure
and high temperature on start-up.
•
Crank disconnect and overspeed sensing
operates from a magnetic pickup signal
(requires 2 Vrms minimum) or alternator
tachometer terminal.
Important: Off-panel items such as senders, mag-
netic sensors and CT’s must be ordered separately.
Specifications
NOTE: These specification apply to all models
unless otherwise indicated.
MGC447 models: EMS447 controller.
MGC547 models: EMS547 controller.
Power Requirements:
12 VDC battery for 12 V models.
24 VDC battery for 24 V models.
Operating Temperature: -4 to 149°F (-20 to 65°C).
Storage Temperature: -4 to 149°F (-20 to 65°C).
Relative Humidity: 95%RH @ 60°C (140°F).
Communications:
MGC447: 1-RS485 serial port.
MGC547: 2-RS485 and 2-RS232 serial ports.
Digital Inputs: 3 optically-isolated, (positive voltage
or ground) such as from Murphy SWICHGAGE
®
s.
Input 1: Auto position on toggle switch
*
Input 2: Test position on toggle switch
*
Input 3: Spare 1 Input
Analog Inputs: 7
Analog 1: Water Temperature Sender
Analog 2: Engine Oil Pressure Sender
Analog 3: Low Coolant Input (closed on fault)
Analog 4: Oil Level Input (closed on fault)
Analog 5: AC Volts (0-5 VDC)
*
Analog 6: AC Amps (0-5 VDC)
*
Analog 7: Remote Start/Stop
Frequency Input: 1 optically-isolated for speed
reference from magnetic sensor (pickup).
Outputs: 7
Output 1: Fuel Solenoid
†
Output 2: Starter
†
Output 3: Common Fail
†
Output 4: Glow Plug
**
Output 5: Generator Regulator Control
**
Output 6: Phase 2 Selection
*
Output 7: Phase 3 Selection
*
NOTE: I/O’s and comm. ports are program specific
and will vary depending upon the software program
used. Custom programming is available.
*
Internal, not for customer connection.
**
Open collector transistor type, 300 mA maximum.
To drive customer supplied relay.
†Auxiliary relay, customer connection is
form “A” relay contact, 12 V, 40 A; 24 V, 16 A.
MGC547
