Elevator installers and repairers service and update old equipment that has been in operation for many years. Or they may work on new systems, which may be equipped with state-of-the-art microprocessors capable of monitoring a whole elevator system and automatically operating it with maximum possible efficiency. Installing and repairing elevators requires a good understanding of electricity, electronics, and hydraulics.
Installers begin their work by examining plans and blueprints that describe the equipment to be installed. They need to determine the layout of the components, including the framework, guide rails, motors, pumps, cylinders, plunger foundations, and electrical connections. Once the layout is clear, they install the guide rails (for guiding the elevator as it moves up and down) on the walls of the shaft. Then they run electrical wiring in the shaft between floors and install controls and other devices on each floor and at a central control panel. They assemble the parts of the car at the bottom of the shaft. They bolt or weld together the steel frame and attach walls, doors, and parts that keep the car from moving from side to side as it travels up and down the shaft. They also install the entrance doors and doorframes on each floor.
Installers set up and connect the equipment that moves the cars. In cable elevator systems, steel cables are attached to each car and, at their other end, to a large counterweight. Hoisting machinery, often located at the top of the shaft, moves the cables around a pulley, thus moving the elevator car up or down and the counterweight in the opposite direction. In hydraulic systems, the car rests on a hydraulic cylinder that is raised and lowered by a pump, thus moving the elevator car up and down like an automobile on a lift. New technology also is being developed to run elevators without cables, using magnetic fields instead. Regardless of the type of elevator involved, after the various parts of the elevator system are in place, the elevator installers test the operation of the system and make any necessary adjustments so that the installation meets building and safety code requirements.
In hotels, restaurants, hospitals, and other institutions where food is prepared, elevator installers may work on dumbwaiters, which are small elevators for transporting food and dishes from one part of a building to another. They may also work on escalators, installing wiring, motors, controls, the stairs, the framework for the stairs, and the tracks that keep the stairs in position. Increasingly, installers are working on APMs, or automated people movers, the sort of "moving sidewalks" you might see at an airport.
After elevator and escalator equipment is installed, it needs regular adjustment and maintenance to ensure that the system continues to function in a safe, reliable manner. Elevator repairers routinely inspect the equipment, perform safety tests using meters and gauges, clean parts that are prone to getting dirty, make adjustments, replace worn components, and lubricate bearings and other moving parts.
Repairers also do minor emergency repairs, such as replacing defective parts. Finding the cause of malfunctions often involves troubleshooting. For this reason, repairers need a strong mechanical aptitude. In addition, repairers may work as part of crews that do major repair and modernization work on older equipment.
Elevator installers and repairers use a variety of hand tools, power tools, welding equipment, and electrical testing devices such as digital multimeters, logic probes, and oscilloscopes.
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