Operation, Troubleshooting and Repair

been adjusted for proper running speed, turn Mode Selector switch OFF.

(e)All lights on the back of the MC-900 should go off and the engine stop. If engine does not stop, check run solenoid to be sure it has returned to the stop position.

4-4.3Overspeed Switch Setting; To set the speed switch, proceed as follows:

(a)Turn Mode Selector switch to the START position.

(b)Engine should crank and start. Return switch to RUN position.

(c)With engine running, adjust governor to bring engine speed to normal RPM.

(d)Depress and hold the Overspeed Test pushbutton.

(e)Slowly turn the Overspeed Set adjustment counter- clockwise until the “Overspeed” and “Overspeed Relay” lights on the MC-900 come on and the engine shuts down.

(f)Release pushbutton; check “Overspeed” light on front panel to be sure it is on.

(g)Turn Mode Selector switch OFF to reset shutdown circuits.

(h)Restart engine, when engine starts, increase governor speed setting slowly until engine shuts down on overspeed. This should occur about 10% above governor speed.

(i)Turn Mode Selector switch OFF.

4-4.4Overcrank setting; to test the time before system shuts down on overcrank;

(a)Disconnect the run solenoid wire from terminal 6 of the Relay Module.

(b)Check time set on the “Crank Time” switch on MC-900 back panel. It is factory set at 15.

(c)Turn Mode Selector switch to START.

1.Engine will crank for 15 seconds.

2.After 15 seconds the “Overcrank” light on the MC- 900 will come on and engine will stop cranking.

(d)Turn Mode Selector switch OFF.

(e)Reconnect the run solenoid wire at terminal 6 of the Relay Module.

4-4.5Oil Pressure; to test oil pressure shutdown circuit:

(a)Turn Mode Selector switch to START. When engine starts, wait 30 seconds then,

(b)Use a jumper wire and short from terminal 28 to 4.

(c)”Oil Pressure” light will come on and engine will stop.

(d)Turn Mode Selector switch OFF.

4-4.6Water Temperature; to test the water temperature shutdown circuit:

(a)Turn Mode Selector switch to START. When engine starts, wait 30 seconds then,

(b)Use a jumper wire and short from terminal 29 to 4.

(c)“Water Temperature” light will come on and engine will stop.

(d)Turn Mode Selector switch OFF.

4-4.7All other Shutdowns; all other shutdowns would be tested in the same manner.

(a)For shutdown circuits which are locked out by the Shutdown Time Delay Bypass, you must wait 30 seconds before running the test.

(b)Circuits that are not locked out may be tested as soon as the engine is running or may be tested without starting

the engine by turning the Mode Selector switch to RUN position.

(c)To test other shutdowns, a jumper wire can be used to short the input terminal for that circuit, to ground, terminal 4.

Section 5: Operation

5-1 Operator Controls.

5-1.1Mode Selector Switch; allows the operator to start the engine (START), run the engine (RUN), or stop the engine (OFF).

5-1.2The OFF position on the mode selector also provides a reset function for the shutdown circuits. If the engine is shut down by the automatic control, the operator must turn selector off and back on to reactivate the system.

5-1.3Push to Test Lamps; this pushbutton tests the shutdown indicator lights.

5-2 Operating Modes.

5-2.1The MC-900 Generator Engine Control has only one operating mode: manual start and automatic shutdown on a sensed failure of one of the monitored inputs.

5-2.2Manual electric start is provided for operation of the generator set.

5-2.2.1To initiate Manual start, place the Mode Selector switch in the START position. This provides a start signal to the engine starter.

5-2.2.2When engine starts, return selector switch to RUN. This removes start signal and the engine will run.

5-2.3OFF or Not Operating; to prevent operation of the engine, turn selector switch OFF.

5-2.3.1The OFF position is used as a reset for any automatic shutdown that occurs.

Section 6: Routine Maintenance and Operational Tests

6-1 Routine Maintenance.

6-1.1Due to the design and types of components used, very little maintenance is required to the MC-900 Control.

6-1.2Visual inspection of the internal wiring of the control panel, along with checking wire connections for tightness, should be done on a semiannual schedule for stand- by systems or quarterly for prime power. Check wire bundles for chafing and wear to the insulation of the wires where they contact the panel or engine.

6-1.4Shutdown Circuits should be tested on a monthly basis for prime power and quarterly for stand-by sets. The same tests run during pre-operation check out, Section 4-4, should be included.

6-2 Operational Tests.

6-2.1No special operational tests are required. The routine operational tests for the generator set will exercise the control.

Section 7: Troubleshooting and Repair

7-1 Tools Required.

7-1.1Some of the tools necessary for troubleshooting are built into the MC-900 Series controls.

7-1.1.1By observing the lights on the front and rear of the control panel, clues to a problem and the possible source can be seen.

MC-900 Series specifications

The Murphy MC-900 Series stands out as a premier solution in the realm of engine monitoring and control technology. Designed for reliable performance in various demanding applications, the MC-900 Series is tailored for both diesel and gas engines, making it a versatile choice for industries ranging from marine to construction and beyond.

One of the primary features of the MC-900 Series is its comprehensive monitoring capabilities. The device is equipped with advanced sensors that provide real-time data on crucial engine parameters such as temperature, pressure, speed, and more. With its easy-to-read LCD display, operators can quickly access this information, facilitating proactive management of engine performance and health.

The MC-900 Series utilizes cutting-edge technology, including microcontroller-based processing, which enhances its operational reliability and accuracy. This technology allows the MC-900 to execute complex algorithms that monitor engine performance, ensuring optimal operation while minimizing risks of failure. Additionally, the system supports multiple input types, enabling seamless integration with a wide range of sensor configurations.

Durability is a standout characteristic of the Murphy MC-900 Series. Designed to withstand harsh environments, the unit boasts a robust construction with water-resistant housing. This resilience ensures that it can perform effectively in extreme temperatures, vibrations, and other challenging conditions often encountered in industrial settings.

Another critical aspect of the MC-900 Series is its customizable alarming system. Users can set thresholds for various parameters, triggering alarms when values exceed predefined limits. This feature allows for timely intervention, reducing the likelihood of engine damage and downtime.

Moreover, the MC-900 Series offers ample connectivity options, including analog and digital outputs. This flexibility supports integration with other control systems and devices, making it an excellent choice for modern applications requiring comprehensive data connectivity.

In summary, the Murphy MC-900 Series is an advanced engine monitoring solution known for its reliability, durability, and sophistication. With state-of-the-art technologies, customizable features, and robust construction, it addresses the needs of various industries and ensures optimal engine operation, longevity, and safety. Whether for monitoring fuel efficiency or safeguarding against potential malfunctions, the MC-900 Series is designed to meet the rigorous demands of engine management in today’s fast-paced environments.