Unit of competency
Modification History
Release 1. New unit of competency.
Application
This unit involves the skills and knowledge required to operate control systems on board a commercial vessel. It includes basic knowledge of control theory and knowledge required to analyse the operation and performance of signal transmissions systems, electronic transmitters, final control element arrangements, electronic temperature sensors and transmitters, governors, PID electronic controllers, machinery space monitoring alarm and control systems.
It also includes knowledge of fault finding techniques for control systems, measurement and test equipment used for fault finding electronic apparatus, operational applications of analogue and digital programmable logic controllers, and procedures for programming, operating, and maintaining PLC controlled systems.
This unit applies to the work of a Marine Engineer Class 1 on commercial vessels of unlimited propulsion power and forms part of the requirements for the Certificate of Competency Marine Engineer Class 1 issued by the Australian Maritime Safety Authority (AMSA).
No licensing, legislative or certification requirements apply to this unit at the time of publication.
Pre-requisite Unit
Not applicable.
Competency Field
L – Marine Engineering
Unit Sector
Not applicable.
Elements and Performance Criteria
Elements describe the essential outcomes. |
Performance criteria describe the performance needed to demonstrate achievement of the element. |
||
1 |
Explain control theory |
1.1 |
Time lag is distinguished from time constant |
1.2 |
Effect resistance and capacitance has on process system response is demonstrated |
||
1.3 |
Transfer function is established and defined |
||
1.4 |
Effect of variations in undamped natural frequency on control systems is illustrated |
||
2 |
Analyse signal transmissions systems used for monitoring, controlling and shutting down machinery |
2.1 |
Methods and limitations of different signal transmissions systems are compared |
2.2 |
Standard pneumatic system and standard analogue 4-20 mA system of signal transmission are compared and contrasted |
||
2.3 |
System of a communications bus using digital signal transmission with optical and electronic systems is explained |
||
2.4 |
Limitations and advantages of a communications bus system are analysed |
||
3 |
Analyse electronic transmitters |
3.1 |
Principles of operation of a typical 4-20 mA transmitter are explained |
3.2 |
Application of strain gauges and changes in capacitance as sensors for pressure and differential pressure transmitters are outlined |
||
3.3 |
Methods of testing transmitter outputs are recorded explained |
||
3.4 |
Application of differential pressure transmitters to liquid level sensing is analysed |
||
3.5 |
Use of a differential pressure transmitter to measure flow is analysed and compared with non-restrictive electronic systems |
||
4 |
Evaluate final control element arrangements |
4.1 |
Pneumatic, electric and hydraulic actuation are compared and contrasted |
4.2 |
Arrangements for locking pneumatic control valves in their last position on air failure are outlined |
||
4.3 |
Control valve trim characteristics are explained |
||
4.4 |
Control valve selection for machinery space duties are analysed |
||
5 |
Evaluate electronic temperature sensors and transmitters |
5.1 |
Colour coding of tails and compensating cables for thermo couple types are identified |
5.2 |
Temperature/mV outputs and application of common thermo couple types are illustrated |
||
5.3 |
Relationship between resistance and temperature for PT100 resistance temperature device and method of testing three wire arrangements is explained |
||
5.4 |
Arrangements of interfacing thermo couples and RTDs with 4-20ma systems and 1-5 volt interface cards are analysed |
||
6 |
Analyse PID electronic controllers |
6.1 |
Principle of operation of an electronic analogue 3-term controller and how adjustments are made is explained |
6.2 |
Open loop response and PID controller testing and calibration is demonstrated |
||
6.3 |
Application of modern single loop digital controller is explained |
||
6.4 |
Programming requirements for manual and auto tuning when adjusting digital controllers are demonstrated |
||
7 |
Evaluate performance of machinery space monitoring alarm and control systems |
7.1 |
Capacitance sensing and float level monitoring systems are compared |
7.2 |
Single, two and three element boiler water level control systems involving feedwater and cascade systems are analysed |
||
7.3 |
Requirements and systems to provide advanced combustion control systems and sequential control for burner management are outlined |
||
7.4 |
Concepts and arrangements for central cooling and load dependent cooling control systems are explained |
||
7.5 |
Main engine control arrangements for fixed pitch propeller and CPP systems requiring sequential control are analysed |
||
7.6 |
Tests and procedures to meet UMS requirements are explained, and alarm and monitoring systems involving data loggers, alarm print outers, and trend analysis are evaluated |
||
8 |
Explain fault-finding techniques for control systems |
8.1 |
Governor adjustments are demonstrated and effect of incorrect adjustments is explained |
8.2 |
Common defects in mechanical and electronic governors are itemised |
||
8.3 |
Indication of faults and procedures of fault finding in 4-20mA loops are explained |
||
8.4 |
Fault-finding techniques in pneumatic control systems and their respective components are analysed |
||
8.5 |
Fault-finding flow diagram is illustrated |
||
8.6 |
Off limit performance, fault detection and principles of rectifications for common engine room control systems are evaluated |
||
9 |
Analyse measurement and test equipment used for fault-finding electronic apparatus |
9.1 |
Principles of operation of cathode ray oscilloscope are explained |
9.2 |
Need for pulse shaping in electronics is examined |
||
9.3 |
Different methods of testing common alarms systems are compared |
||
9.4 |
Methods used in stabilisation, surveillance and monitoring of control power supplies are demonstrated |
||
10 |
Analyse governors |
10.1 |
Governor faults are diagnosed and interpreted, identifying and evaluating appropriate adjustments and maintenance to be made |
10.2 |
Specific governor applications requiring torque limitation, critical speed range avoidance are outlined |
||
10.3 |
Typical electronic governors are explained using labelled diagrams to indicate major components and features |
||
10.4 |
Governor adjustments to allow operation of propulsion and power generation diesels in both shared load and standalone applications are specified |
||
10.5 |
Response of a diesel engine governor on change in engine load using both feedback and feed forward control is explained using labelled diagrams to indicate major components and adjustments |
||
11 |
Explain operational applications of analogue and digital programmable logic controllers (PLC) |
11.1 |
Methods of programming PLCs are assessed |
11.2 |
Memory applications of PLCs are outlined |
||
11.3 |
Input devices used with analogue PLCs are identified |
||
11.4 |
Fibre optic data transmission systems are explained |
||
11.5 |
Methods used for storing binary data and operating registers are explained |
||
12 |
Document procedures for programming, operating and maintaining PLC controlled systems |
12.1 |
Procedure for identifying required control system functions are explained |
12.2 |
Procedure for connecting PLC to system control elements is outlined |
||
12.3 |
System operating procedure is outlined |
||
12.4 |
Procedure for modifying system and program as necessary to provide adequate and appropriate safety requirements, is outlined |
||
12.5 |
Maintenance and fault-finding procedures are outlined |
||
12.6 |
Required documentation is prepared and accuracy is verified |
Foundation Skills
Foundation skills essential to performance are explicit in the performance criteria of this unit of competency. |
Range of Conditions
Range is restricted to essential operating conditions and any other variables essential to the work environment. |
|
Methods of testing transmitter outputs include one or more of the following: |
|
Faults must include: |
|
Governor adjustments must include: |
|
Unit Mapping Information
This unit replaces and is equivalent to MARL6019A Demonstrate advanced knowledge of marine control systems and automation.
Links
Companion Volume implementation guides are found in VETNet - https://vetnet.gov.au/Pages/TrainingDocs.aspx?q=772efb7b-4cce-47fe-9bbd-ee3b1d1eb4c2