Quantcast Elevator Speed (Electric Traction Elevators)

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2.1.2.1 Elevator Speed (Electric Traction Elevators). Elevator operating speed is measured with
a tachometer while the elevator makes a full run through the hoistway with no load in the car.
Operating speed should be maintained at a level of plus or minus 6% of the rated speed (to be
found on the governor rating plate or the crosshead on the car) under any load condition in both
directions of travel. The 5% figure is reasonable tolerance for most equipment. However
consideration must be given to the actual equipment being examined. Generally, equipment
installed before 1975 was not designed to include the speed regulation circuitry used today. In
these cases a greater amount of variation must be expected. All equipment should be capable of
maintaining a variation level of 10% regardless of age.
2.1.2.2 Door Opening Time. Measured from the instant the doors begin to open until the doors
are fully open. Door opening time should be as fast as possible to provide efficient elevator
service. The recommended door times are based on the fastest speed obtainable with the door
operation equipment installed while providing smooth operation and long equipment life. (See
Table 2-1).
2.1.2.3 Door Closing Time. Measured from the instant the doors begin to close until the doors
are fully closed. The A17.1 Code limits door closing time by defining the level of kinetic energy
generated during door closing operation. The closing time is determined by the approximate
A17.1 Code requirements based on average door weight. (See Table 2-1).
2.1.2.4 Door Hold Open Time. Measured from the instant the doors are fully open until the
doors begin to close when the car stops in response to a hall call. The door hold open time
should be adjusted to best meet the needs of the passengers.
2.1.2.5 Door Closing Force. Measured with a door pressure gauge as the doors attempted to
close. The measured value is the pressure required to prevent the doors from closing under
power. ANSI/ASME A17.1 Safety Code for Elevators and Escalators requires that door pressure
be no more than 30 lbs.
2.1.2.6 Performance Times (floor to floor times). Performance time is measured from the
instant the doors begin to close on one floor until the elevator is stopped level with the next
successive floor, up or down, with the car doors approximately 3/4 open. A calculated
reasonable standard time for various types of elevators are shown in Table 2-2.
2.1.2.7 Acceleration, Deceleration, Floor Stopping and Noise. The car should stop at each
landing at a point no greater than 3/8" above or below the floor. Acceleration and deceleration
should be smooth with no noticeable "Steps" to attain or reduce speed. Stopping should be
smooth. No unusual noises should be heard.
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