Marine Monitoring System II Caterpillar

Components Included the System

Particle Detector

Illustration 1	g00763721

The particle detector warns the engine when metal particles are detected in the lubricating oil. The particle shuts down the engine when metal particles are detected in the engine oil. The sensor consists of a grid that has parallel copper traces on a circuit board. Alternate traces are connected to +24 VDC and to the I:3.0/4 input of the PLC. When an electrically conductive particle bridges the gap between the parallel traces, current flows. The I:3.0/4 input of the PLC becomes active. This triggers an alarm. If the condition exists after a time delay, the engine will shut down.

Jacket Water Detector Switch

The switch is an electronic sensor that detects the presence of coolant. If coolant is present, the output of the switch is OFF. If coolant is not present, the relay "JWDAR" is energized. An alarm is generated.

Start Oil Switch

The start oil switch is used in order to determine if the engine is lubricated prior to starting. The control panel supports both the intermittent prelube system and the continuous prelube system. A pressure switch is used with intermittent prelube systems. A detector is used with continuous prelube systems.

Pressure Switch

Illustration 2	g00763777

The switch is mounted in the passage that is connected to the main oil galley. When the pressure reaches 9±3 kPa, the switch closes and the "SOSR" relay is energized. The "Starting Oil Pressure Lamp" turns on and the engine is allowed to start.

Liquid Detector Gp

Illustration 3	g00763726

The switch is an electronic sensor that detects the presence of oil. If oil is present, the output of the switch is ON, and the "SOSR" relay is energized. The "Starting Oil Pressure Lamp" turns on and the engine is allowed to start.

Pressure Sender

Illustration 4	g00763715

The pressure sender varies resistance with pressure. The variable resistance is used in order to drive the "Air Start Gauge".

Oil Level Switch

The switch provides an alarm signal if the oil level is too low in the oil pan. The switch is wired in the normally open position. A normal water level in the expansion tank holds the contacts of the switch closed. If the oil level falls and the contacts break, the I:3.0/0 input of the PLC becomes inactive. An alarm is then generated.

Speed Sensor for the Turbocharger

The turbocharger speed sensor is used in order to measure the rotational speed of the turbocharger in RPM. The speed is monitored and an alarm is generated when the speed of the turbocharger exceeds 35000 RPM.

Speed Sensor

Illustration 5	g00763729

The turbocharger may have a speed sensor that is installed. When the correct number of pulses/revolution is configured into the PLC, the PLC will convert the pulse that is generated by the blade pass into the RPM for the turbocharger.

Speed Sensor with Straight Inlet or with Silencer

This sensor is optional. The sensor detects the speed of the turbocharger from a magnet that is mounted in a cone on the shaft of the turbocharger.

Speed Sensor with 90° Inlet

Illustration 6	g00763728

This sensor is optional. The sensor detects the speed of the turbocharger from a slot on a bolt that is mounted on the turbocharger.

Optional Components

Rotary Sensor

Illustration 7	g00763722

The sensor is tied to the fuel control housing through a linkage. Movement of the fuel control linkage is converted into an electrical signal. The signal is amplified to a 4-20 mA signal that is proportional to the position of the rack of the engine. Refer to Special Instruction, REHS0923 for information on calibration and adjustment.

Liquid Level Switch

Illustration 8	g00763723

The switch provides an alarm signal if the water level in the expansion tank is too low. The switch is wired in the normally open position. A normal water level in the expansion tank holds the contacts of the switch closed. If the water level falls and the contacts break, the I:3.0/5 input of the PLC becomes inactive. An alarm is then generated.

Oil Mist Detector

Illustration 9	g00763727

The system is used in order to detect the presence of an oil mist in the crankcase. An oil mist is caused by overheating of the main bearings, the connecting rod bearings, or the piston components. When an oil mist is detected, the oil mist detector activates the OMDA relay and the I:3.0/15 input of the PLC becomes inactive. An alarm is then generated.

The condition of the oil mist detector is sensed by the PLC. When the OMDA relay is in the de-energized position the I:3.0/14 input of the PLC becomes inactive. An alarm for failure in the sensor is generated.

Refer to Service Manual, RENR2225 for information on troubleshooting and maintenance.