ASME HST-4:2021 pdf free download – Performance Standard for Overhead Electric Wire Rope Hoists
SECTION 4-0.2: DEFINITIONs
abnormal operating conditions: environmental conditions that are unfavorable, harmful, or detrimental to the operationof a hoist, such as excessively high or low ambient temperatures; exposure to weather, corrosive fumes, dust-laden ormoisture-laden atmospheres; and hazardous locations.
ambient temperature: the temperature of the atmosphere surrounding the hoist.
base or deck mounted: a type of mounting where the hoist is mounted to the top side of a horizontal supporting surface.beam: an overhead standard structural or specially fabricated shape on which the trolley operates.
block, load: the assembly of hook or shackle, swivel, bearing. pins,sheaves, and frame suspended by the rope.This shallinclude all appurtenances reeved into the hoisting rope.
brake: a device, other than a motor,used for retarding or stopping motion by friction or power means.
brake, holding: a friction brake for a hoist that is automatically applied and prevents motion when power is off.brake, mechanical load: an automatic type of friction brake used for controlling loads in a lowering direction. Thisunidirectional device requires torque from the motor to lower a load but does not impose additional load on themotor when lifting a load. A mechanical load brake may also be used as a holding brake if designed as such bythe manufacturer.
braking, control: a method of controlling speed by removing energy from the moving body or by imparting energy in theopposite direction.
braking, countertorque (plugging): a method of controlling speed by applying a variable motor torque in the directionopposite to the direction that the motor is rotating as it is being overhauled by the load.
braking, dynamic: a method of controlling speed by using the motor as a generator, with the energy being dissipated byresistance.
braking, eddy current: a method of controlling or reducing speed by means of an electrical induction load brake.braking, mechanical: a method of controlling or reducing speed by friction.
braking,regenerative: a method of controlling speed in which the electricalenergy generated by the motor is fed back intothe power system.
ceiling mounted: a type of hoist mounting where the hoist is mounted to the underside of a horizontal supporting surface.chain,hand: the chain provided to control movement of a hand-chain-operated trolley.
contactor: an electromechanical device for opening and closing an electric power circuit.
control: a device or group of devices that serves to govern in some predetermined manner the power delivered to theapparatus to which it is connected.
control actuator: a manual means at the operating station by which hoist or trolley controls are energized.control enclosure: the housing containing the electrical control components.
cushioned start: an electrical or mechanical method for reducing the rate of acceleration of trolley motion.drum: the cylindrical member around which the rope is wound for lifting and lowering the load.
hazardous (classified) locations: locations where fire or explosion hazards may exist.Locations are classified dependingon the properties of the flammable vapors,liquids, or gases, or combustible dusts or fibers that may be present, and thelikelihood that a flammable or combustible concentration or quantity is present (refer to ANSI/NFPA 70).