Rated speed

Rated speed also known as contract speed, is the maximum permissable speed for an elevator. Any given elevator may travel at, or slower than the rated speed, but never above it.

Safety

The rated speed is enforced by the overspeed governor. When a lift reaches a predetermined excess of its contract speed, the governor will activate and break the safety circuit on the lift, forcing the motor brake to apply and the motor to power off. If this fails to stop the lift, the governor also engages emergency brakes on the lift car itself to quickly decelerate the lift car.

Elevator

Drive systems: Traction • Winding Drum • Hydraulic Types of elevators: Double Deck • Dumbwaiter • Fireman's • Freight • Incline • Passenger • Residential • Wheelchair lift Concept: Capacity • Destination dispatch • Hall call prediction • Elevator algorithm • Elevator control system • Elevator machine room • Elevator maintenance • Elevator monitoring system • Elevator modernization • ACOP & UCMP • Machine room less elevator • Major alterations • Rated speed Elevator systems, controllers and equipments: Elevator emergency automatic rescue device • Elevator fixtures • Elevator keys • Elevator special modes • Elevator doors • Door cam • Door interlocks (Interlock wiring communication system) • Door restrictor • Elevator Inspection Certificate • Emergency stop button • Floor designators • Gate switch • Old Deadman controls • Overspeed governor • Motor-generator set & Silicon-controlled rectifier (for DC-powered elevators) • Insulated-gate bipolar transistor (for AC-VVVF-powered elevators) • Selector • Tape head • Regenerative converter (for AC-VVVF-powered elevators) See also: List of elevator fixtures guide • List of elevator and escalator companies • Elevator door sill guide (Non-proprietary elevator component door sill guide) • Floor numbering (Unlucky floor numbers) • Elevator incidents and accidents