Page 41 - AP2464B E-BOOK (KKR2 TOWER)
P. 41
INTRODUCTION OF ELEVATOR
SYSTEM
TYPE OF ELEVATOR
SYSTEM?? ROPING SYSTEM
GEARLESS TRACTION SINGLE WRAP 2:1
SYSTEM
Gear-less Traction Elevators have the wheel Single wrap 2:1 is an alternative for use with
attached directly to the motor. Gear-less larger cars. This system doubles the load
traction elevators are capable of speeds up to carrying capacity of the machinery but requires
2,000 feet per minute and they have a more rope and also reduces the car speed by
maximum travel distance of around 2,000 feet 50%. After the ropes are connected at both the
so they are the only choice for high-rise ends, the car support must remain intact (when
applications. the car is assembled at bottom). Crank the drive
sheave slightly to lift the counterweight frame up
and secure it. Do not put any fillers in the
The overhead machine room contains the counterweight.
gearless machine motor and drive sheave that
coordinate to move the ropes, which raise and
lower the car and the counterweight. This Check and ensure the counterweight side
application utilizes a drive sheave, motor, ropes up to the main sheave have equal
counterweight, and ropes which are the same tension. After raising the counterweight frame,
components used by the geared traction the ropes at the car side around the car
elevator. This application can be used for front sheave will become loose. Check the rope’s
openings as well as front and rear opening loop for equal length. If the loops are the same
configurations. for all the ropes, assume the rope lengths are
correct.
The gearless traction drive sheave has "U" If any rope has gained slack, shorten it. If any
shaped grooves, allowing it to grip (friction) the rope loop is found tight, this also needs
ropes. This creates traction and moves the car. appropriate correction. Remember that
The electric motor interfaces directly with the whatever correction is needed, it must be
drive sheave. The gearless machine, along done prior to loading the car and
with the related drive equipment, is located counterweights. Never allow a loaded wedge
above the hoist way in a penthouse or loop of rope (bend portion), when redone, to
overhead machine room. The gearless come in the live side during a lengthening
machine is not used for basement process or correction
applications.
