This unit involves the skills and knowledge required to develop, connect and functionally test electrical power and control circuits that perform specific control functions.
It includes working safely, developing schematic diagrams and converting them to wiring diagrams, selecting and connecting contactors and control devices to perform a specific function. It also includes testing electrical control circuits and completing circuit development activities documentation.
The skills and knowledge described in this unit require a licence or permit to practice in the workplace where work is carried out on electrical installations which are designed to operate at voltages greater than 50 volt (V) alternating current (a.c.) or 120 V direct current (d.c.).
Assessment tasks will be designed to reinforce & extend knowledge and skill competence within set & controlled parameters in accordance with each unit’s learning outcomes & performance criteria requirements, incl the setting of work based practical application tasks designed to provide evidence of competence outcomes, within periodic and scheduled timelines.
Students will be expected to demonstrate the following required skills:
*applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices, including using risk control measures
*applying sustainable energy principles and practices
*using manufacturers’ catalogues to select:
*circuit components for appropriate duty ratings
*control devices for specified requirements
*pushbuttons/pilot lamps for specific requirements
*relays for specified requirements
*the most suitable motor starter for a given situation
*timers for specified functions
*labelling wires and terminals
*converting circuit (schematic) diagrams to wiring diagrams
developing forward reverse circuit requiring interlocking from a description of the circuit operation, including jog and interlock functions:
*electrical control circuit in accordance with a written description (specification) and listing the sequence of operation
*control circuit incorporating local and remote start and stop buttons and electrical interlocking
*simple stop-start control circuit that incorporates pilot lights and latching circuit
*timer controlled circuits from a written description and listing the sequence of circuit operation
*measuring starting current and torque of selected motor starters
*connecting and testing:
*circuit with a braking feature to operate a three phase motor
*control devices into control circuits
*direct-on-line (DOL) motor starter and testing the operation of the power and control circuits
*variable speed drive (VSD)
*electronic (soft) starter
*electrical circuits with local and remote start-stop control
*input and output devices to a programmable relay using a diagram
*motor starter power and control circuits for correct operation
*multiple motor starting circuit which incorporates start, stop and jog control
*simple electrical control circuit from circuit diagrams
*timer controlled circuit using a circuit diagram as a guide
*completing and documenting circuit development activities.
The qualified trainer and assessor will advise students of class notes, reading materials produced by VU Polytechnic and further support via VU Polytechnic e-learning system and/or in person.
This unit is studied as part of the following course(s):