PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I Page: 70 of 161
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five speed points in hoisting and lowering. Smooth acceleration must be
provided for all loads in both directions and lowering shall be accomplished
without the use of a mechanical load brake.
Speed on the first lowering point shall not exceed 15% of
synchronous speed of the hoist motor for lowering a hook load of 25% to
100% of rated load. Lowering speeds for all loads within the rated capacity
shall be gradually increased by advancing the controller from "off" position _
towards "full on" lowering position. The speed change between lowering
steps shall not exceed 35% synchronous speed at any given load up to 100%
rated capacity. The last point lowering shall provide regenerative brak-
ing. The lowering speed shall not exceed 125% of the synchronous speed
on any control point.
The primary alternating current shall be balanced in each
of the three phases at all times. The primary alternating current shall not
exceed 130% full load motor current in the hoisting direction and shall not
exceed full load motor current in the lowering direction. The speed on the
first hoisting point with no load on the hook shall not exceed 25% of the syn-
chronous speed of the motor and shall not pass through the zero speed line
with any load up to 125% of rated crane capacity. The hoisting speeds for
all loads within the rated crane capacity shall be gradually increased by
depressing the control pushbutton from the "off" position towards the "full -
on" hoisting position.
Mechanical brakes, spring set and electrically released,
shall be provided on the hoist motor. A permanent pole alternator shall
be connected to the magnetic eddy current load brake so that lowering
speed in the event of simultaneous electric power and mechanical motor
brake failure is limited to approximately 25 per cent of full load hoisting
The speed of motion of the bridge and of the trolley shall
be 30 ft/min for each motion, with the respective drive motors operating
at synchronous speed. The controllers for these motions shall be full
magnetic type, having not less than five speed points in either direction.
Smooth acceleration must be provided for all loads in all directions. The
speeds obtained in the five speed positions of the control pushbuttons shall
have approximately the same relationship with each other, under all load
conditions, as those obtained with the hoisting control.
Control of all motions of the crane shall be by pendant
pushbuttons. Separate five-position pushbuttons for hoist raising, hoist -
lowering, trolley forward, trolley reverse, bridge forward, and bridge
reverse, as well as power on and off buttons, shall be mounted in a pendant
control box suspended by a chain from the crane trolley on the steam con-
denser area side of the crane hook. Suspension of the pendant control box
from a separate monorail trolley would be preferable, if possible.
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Fromm, L.W.; Bernsen, S.A.; Bullinger, C.F. & Matousek, J.F. PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I, report, July 15, 1957; Lemont, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1023272/m1/70/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.