MEM10023 — Design and connect control switching of circuits for building services and industrial equipment

Elements & performance criteria

Performance evidence

• following work instructions, standard operating procedures (SOPs) and safe work practices
• identifying and interpreting circuits, drawings, plans and specifications relevant to the work to be undertaken
• determining the electrical and non-electrical isolation requirements to prevent the creation of hazards linked from the loss of machine/system/process control according to established procedures
• using lock out tag procedures with appropriate tags/signs
• proving electrical isolation and following established safety rules prior to working on electrical equipment or wiring
• ensuring all electrical equipment and tools are tested and tagged and are up to date
• developing according to specifications at least five (5) or more of the following control circuit designs: - multiple light switching circuit - master control circuit - local start-stop control and with electrical interlocking - connecting a timer in a controlled circuit - a multiple motor starting circuit which incorporates start, stop and jog control - machine safety circuit - line conditioners - inverters - uninterrupted power supplies (UPS) - energy management systems
• terminating and connecting to comply with the above selected control circuit scenarios and regulatory requirements at least five (5) or more of the following control circuit devices: - multi-way switches - switches with more than two positions and Off - push buttons - electromechanical relays - programmable relays - contactors - motor reversing contactors - three-phase starters - reduced voltage starters - transducers/sensors, including: - limit, proximity, float and pressure switches - photoelectric cells - light and temperature sensors
• programming timers and using the monitoring facility of the programmable relay to verify the values of the timer
• testing connected control circuit devices as against agreed design and rectifying any non-compliant functions
• complying with the Australian/New Zealand Wiring Rules and local supply requirements for three-phase motor installations and starters
• testing control circuits to ensure functionality
• using test equipment to locate faults, completing remedial action and retesting to ensure compliance
• documenting connected control circuits in accordance with SOPs

Knowledge evidence

• safe work practices and procedures and use of personal protective equipment (PPE)
• electrical drawings – conventions in linework, symbols used in electrical circuit diagrams, placement and arrangement of circuit components
• drawing schematic circuit diagrams complying with Australian Drawing Standard AS/NZS 1102.101-1989 Graphical symbols for electrotechnical documentation – General information and general index, and converting to wiring diagrams
• construction and operation of contactors and relays with various types of contacts, including: - normally open - normally closed - timed on closing - timed in opening - timed in both closing and opening
• drawing contactors in circuits and drawing conventions applied
• control diagrams drawn as ladder diagrams where the ladder stiles are the supply lines and the ladder rungs are the various circuit lines
• control circuit variations, including: - two-position control - local or remote operation - two-wire control - two-wire and push button control where extra start push-buttons are all placed in parallel and where extra stop push-buttons are placed in series - reversing circuits – use of mechanical and electrical interlocks - jogging control
• common control devices used in circuits, including: - multi-way switches - switches with more than two positions and Off - push buttons - electromechanical relays - programmable relays - contactors - motor reversing contactors - three-phase starters - reduced voltage starters - transducers/sensors, including: - limit, proximity, float and pressure switches - photoelectric cells - light and temperature sensors
• programmable timers, including specifications to be met and functions to be controlled including machine operation or process output
• line conditioners and the purpose they provide
• inverters and the purpose they provide
• energy management systems and the purpose they provide
• static electricity discharge or electrostatic discharge and the hazards associated and the precautions to be taken

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Questions about assessing MEM10023