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Crane Terminology
ADJUSTABLE FREQUENCY DRIVE - A motor controller designed to convert fixed frequency AC power to available frequency power for AC motor speed control. The system is used in conjunction with a squirrel cage motor to control speed over a relatively wide, constant torque range, by maintaining aconstant voltage / frequency ratio. This type of control "leashes" the in-rush current to deliver startup power to the motor as efficiently as possible providing a soft-start feature thereby minimizing load swing. ANTI COLLISION - An Electrical means of keeping 2 or more crane's from contacting each other. ANTI-SKEWING - Capability of the crane design to maintain squareness in relation to the runwaystructure. AUXILIARY HOIST - A supplemental hoisting unit, usually designed to handle lighter loads at a higher speed than the main host. BOGIE - A type of short end truck, used to allow greater distribution of crane wheel loads, by placing multiple wheels at each corner of the crane. BOX SECTION - The rectangular cross section of girders, trucks or other members, comprised of 2 rolled steel sideplates, a top plate, and a bottom plate. BRIDGE - That part of an overhead crane consisting of girders, trucks, end ties, walkway and drive mechanism which carries the trolley and travels in a direction parallel to the runway. BRIDGE GIRDER - The main horizontal structural member(s) of the crane bridge supported by the end trucks. CAMBER - The slight upward vertical curve given to girders tocompensate partially for deflection due to hook load and weight of the Crane. CAPACITY - The maximum rated load for which a crane is designed to handle. Measured in tons. CASK HANDLING CRANE - A crane specifically designed to handle a cask loaded with spent nuclear fuel. A crane of this type is typically provided with single failure proof features. CLEARANCE - Minimum distance from the extremity of acrane to the nearest obstruction. CMAA - Crane Manufacturers Association of America, Inc. (formerly EOCI—Electric Overhead Crane Institute). COLLECTORS - Contacting devices for collecting current from the runway or bridge conductors. The main line collectors are mounted on the bridge to transmit current from the runway conductors, and the trolley collectors are mounted on the trolley to transmitcurrent from the bridge conductors. COVER PLATE - The top or bottom plate of a box girder. CRITICAL LOAD - Any lifted load whose uncontrolled movement or release could adversely affect any safety-related system when such a system is required for unit safety. A crane used for lifting a critical load shall be designed with single failure proof features so that any credible failure of a single componentwill not result in the loss of capability to stop or hold the load. DOUBLE GIRDER CRANE - A crane which runs on two bridge girders mounted between and supported by end trucks at each runway. DRIVE GIRDER - The girder on which the bridge drive machinery is mounted. END APPROACH - The minimum horizontal distance, parallel to the runway, between the outermost extremities of the crane and thecenterline of the hook. END TIE - A structural member other than the end truck which connects the ends of the girders to maintain the squareness of the bridge. END TRUCK - The unit consisting of truck frame, wheels, bearings, axles, etc., which supports the bridge girders. EXPLOSION PROOF CRANE - A crane designed using specially constructed electrical components to prevent the ignition of hazardousmaterials in the surrounding atmosphere, by containing any explosions that may occur within the components. FESTOONING - A method for providing power to a hoist traveling along a beam. FLUX VECTOR DRIVE - A special type of adjustable frequency motor control, utilizing an incremental encoder to constantly monitor the speed and direction of the motor shaft. This "closed-loop" system allows the control...