MN Elevator Mechanic flashcards
MN Elevator Mechanic · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- A17.1 scope
- ASME A17.1/CSA B44 is the safety code for new elevators, escalators, dumbwaiters, moving walks, and related equipment. It covers design, construction, installation, operation, and maintenance requirements.
- A17.2 purpose
- ASME A17.2 provides inspection and testing procedures for existing elevators and escalators. It tells inspectors what to check and how to perform periodic tests.
- A17.4 evacuation
- ASME A17.4 covers emergency evacuation of passengers from stalled elevators. It describes safe procedures for trained personnel to remove passengers without injury.
- A17.6 suspension means
- ASME A17.6 sets requirements for suspension means such as wire rope and coated steel belts. It covers design, inspection, and replacement criteria for elevator suspension.
- A18.1 platform lifts
- ASME A18.1 covers platform lifts and stairway chairlifts used for accessibility. It is separate from A17.1 and addresses capacity, guarding, and operation.
- Governor trip speed
- The car safety governor must trip at a speed between 115% and 140% of rated speed for elevators up to 600 ft/min. Higher speeds use a lower upper limit per the code table.
- Traction machine principle
- A traction elevator relies on friction between hoist ropes and the drive sheave. A counterweight balances the car and about 40-50% of rated load.
- Gearless machine
- A gearless traction machine couples the drive sheave directly to the motor shaft. It is used for higher speeds and eliminates worm-gear losses.
- Car safety types
- A wedge-type safety is instant in action and used at lower speeds. A roller-type safety grips progressively and is used at higher speeds.
- Machine brake requirement
- The traction machine brake must hold 125% of rated load. It is spring-applied and electrically released so it sets automatically on power loss.
- Counterweight function
- The counterweight balances the car weight plus about 40-50% of rated load. It reduces motor effort and improves traction between rope and sheave.
- Hydraulic power unit
- A hydraulic elevator power unit consists of a pump, motor, valve, and oil tank. The pump pressurizes oil to push the plunger and raise the car.
- Relief valve setting
- The hydraulic pressure-relief valve must open at no more than 125% of design pressure. It protects the cylinder, piping, and fittings from overpressure.
- Ruptured valve function
- A ruptured-valve or pipe-break valve limits downward speed if the hydraulic line breaks. It protects against uncontrolled descent of the car.
- Hydraulic travel limits
- Conventional hydraulic elevators are limited to about 60 ft of travel and speeds up to about 200 ft/min. In-ground cylinders and oil volume constrain height.
- Main line disconnect
- The elevator main line disconnect must be lockable in the open position and accessible to maintenance personnel. It must be identified and dedicated to the elevator.
- Phase reversal relay
- A phase-reversal or phase-failure relay protects a three-phase motor from incorrect phase sequence or loss of a phase. It prevents motor damage.
- Machine room lighting
- The machine room must have lighting of at least 10 ft-candles at the floor. A grounded receptacle must also be provided in the machine room and pit.
- Two-way communication
- The car must have a two-way communication means, such as a phone or intercom, that works without building power. It is typically battery-backed.
- Category 1 test
- The Category 1 test is the routine periodic test performed during inspection. It checks safety devices and operation without the full-load safety test.
- Category 5 test
- The Category 5 test is the full-load safety test performed every five years. It verifies the safety can stop and hold 125% of rated load.
- Maintenance records
- Maintenance records must document tests, repairs, and code compliance. They must be available to the inspector and kept current.
- Lockout/tagout
- Lockout/tagout requires the main disconnect to be locked open and tagged before electrical work. Verify zero energy before touching conductors.
- Car-top inspection station
- The car top must have an inspection station with a stop switch and operating controls. A guardrail is required where the code specifies.
- Hoistway barricade
- An open or removed landing door must be barricaded and marked with warning signs. An open hoistway must never be left unattended.
- Minnesota DLI authority
- The Minnesota Department of Labor and Industry administers elevator regulation. The Elevator Safety Code is in Minnesota Rules Chapter 1307.
- Minnesota mechanic license
- Minnesota requires elevator mechanics to be licensed by DLI. Licensing requires passing an examination and meeting experience requirements.
- Minnesota permit requirement
- A permit is required before installing or altering an elevator in Minnesota. The installation must be inspected before it is placed in service.
- Escalator brake test
- An escalator brake must stop a loaded step band within the code stopping distance. The brake is tested during periodic inspection.
- Escalator comb plate
- The comb plate and step/skirt clearance are key escalator inspection points. Missing or broken treads and worn step chains must be corrected.
- Moving walk requirements
- Moving walks are covered by ASME A17.1. Pallet/skirt clearance and handrail/balustrade requirements are similar to escalator requirements.
- A18.1 lift inspection
- A18.1 platform lifts and stairway chairlifts must be inspected and tested. The inspection interval is set by the authority having jurisdiction.