8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and maintaining power operated point actuating devices. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EN108A Power operated point actuating device installation and maintenance Evidence shall show an understanding of power operated point actuating device installation and maintenance, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: Rail signalling principles, electrical Overview of electrical rail signalling encompassing: Types of rail signalling / safeworking systems Note: Systems include: CTC, automatic, controlled and interlocked signalling. Advantages of electrical over mechanical signalling Advantages of CBI over electrical signalling systems Effects of overhead traction systems on electrical signalling systems (where applicable). Purpose of elements of an electrical rail signalling systems. Note: Elements include signals and aspect systems, train protection systems, point actuating systems, mechanical locking, relay interlocking, computer based interlocking, train detection systems, control input devices, indicators, diagrams and monitors, and safe working systems. Rail signalling principles, mechanical Overview of mechanical rail signalling encompassing: Types of mechanical rail signalling systems for different rail traffic Note: Rail traffic may include: passenger train, freight train, maintenance vehicles, heritage/tourism train. Deficiencies of mechanical signalling systems Note: Mechanical systems may include: automatic, controlled and interlocked signalling. Effects of overhead traction systems on mechanical signalling systems (where applicable) Effects of external factors on the mechanical rail signalling system. Note: Factors may include: rail overhead , gradients/terrain, environmental and civil configuration. Purpose of elements of a mechanical rail signalling systems. Note: Elements include signals, point actuating systems, locking and train detection systems, control input devices, indicators, diagrams and monitors, mechanical interlocking frames, safe working systems and electro-mechanical interfaces. Rail signalling, point actuating devices Equipment and their components encompassing: Point actuating mechanisms Note: mechanisms include mechanical, pneumatic, hydraulic and electric powered units Blade and operation detection devices On-rail locking devices Off-rail locking devices Swing nose devices Ironwork and fixtures. Note: Equipment include point machines, detectors, claw/clamp locks, swing nose mechanisms, in-bearer mechanisms Operating principles encompassing: Point operation, normal and reverse Point locking, normal and reverse Point detection, normal and reverse Detectors Off-rail locking operation On-rail locking operation Electric operation of contactors, motor control and detection circuits Interpreting circuit diagrams to evaluate correct operation and relationship to other signalling circuits Normal mechanical movement Failure mode mechanical movement Note: Failure mode must include wrong side and right side conditions identifying if movement should be possible. Correct operation in accordance with control and locking tables. Servicing procedures encompassing: Maintenance documentation Coordination/planning sequence Operational test procedures Scheduled / preventative maintenance Unscheduled / corrective maintenance Certifying point equipment (commission and de-commission). Note: Certifying procedures are only applicable for compliance with rail operator and/or enterprise standards. |