EDDY CURRENT - A method of controlling or reducing speed by means of an electrical induction load brake.
MECHANICAL - A method of controlling or reducing speed by friction.
REGENERATIVE - A method of control in which the electrical energy generated by the motor is fed back into the power system.
CONTROLLER - A device or group of devices which serves to govern in some predetermined manner the power delivered to the motor to which it is connected.
CONTROLLER, MANUAL - A controller having all of its basic functions performed by devices which are operated by hand.
CONTROL PANEL - An assembly of electrical components (magnetic or static) which governs the flow of power to or from a motor in response to signals from a master switch, pushbutton station, or remote control.
COVER PLATE - The top or bottom plate of a box girder.
CRANE, HOT MOLTEN MATERIAL HANDLING (LADLE) - An overhead crane used for transporting or pouring molten material.
CRANE, OUTDOOR STORAGE GANTRY - A special type of gantry crane of long span and with long legs, usually used for the storage of bulk material such as ore, coal, limestone, or sand. This type of crane normally will have one or two cantilevered girder ends with through legs.
CREEP SPEED - A very slow, constant, continuous, fixed rate of motion of the hoist, trolley, or bridge: usually established at 1% to 10% of the normal full load speed.
CRITICAL LOAD - As defined by the Nuclear Regulatory Commission, "A critical load is a load of magnitude or kind that under certain conditions, if dropped, could result in damage leading to unacceptable release of radioactivity or impair the capability to safely shut down the plant."
DEFLECTION, DEAD LOAD - The vertical displacement of a bridge girder due to its own weight plus the weight of parts permanently attached thereto, such as footwalk, drive mechanism, motor and control panels. The dead load deflection is fully compensated for in the girder camber.
DEFLECTION, LIVE LOAD - The vertical displacement of a bridge girder due to the weight of the trolley plus the rated load.
DIAPHRAGM - A vertical plate (or channel) between the girder webs, which serves to support the top cover plate and bridge rail and to transfer the forces of the trolley wheel loads to the webs. Refer to Figure 44 in Part A of Section VII.
DRIFT POINT - A control point on a travel motion which releases the electric brake without energizing the motor.
DRIVE - The assembly of the motor and gear unit used to propel the bridge or trolley.
END TRUCK - An assembly consisting of structural members, wheels, bearings, axles, etc., which supports the bridge girder(s) or the trolley cross member(s)
EXPOSED - Capable of being contacted inadvertently (applies to hazardous objects not adequately guarded or isolated).
FLEET ANGLE - The angle formed by the wire rope and the drum groove or sheave groove in the plane which contains the wire rope and is parallel to the drum or sheave axis. Refer to Figure 90 in Part B of Section VIII.
FOOTWALK - A walkway with handrail and toe boards, attached to the bridge or trolley for access purposes.
GAUGE - The horizontal distance center to center of the bridge rails.