RAIL- TOP MOUNT:
Rail shall be, 4140 steel bar 4 1/2” (114mm) wide x 3/8”
(9.5mm) high with black zinc finish. Rail edges shall be beveled
down to a maximum of 3/16” (4.8mm) to allow for the rail to
be transversed by material handling equipment. Rail shall
disperse the wheel point loads to structural slab. Rail shall
have two permanently mounted floor anchors maximum 15”
(381mm) on center. Rails shall be installed on top of concrete
slab. Rail and carriage design allows concrete slab to be
unlevel at the following maximum variation of 3/16” (4.8mm)
variation over any 2’ (0.6m) rail run and 1/4” (6.4mm) maximum
variation over any 10’ (3.04m) rail run.
RAIL- RECESSED MOUNT:
Rail shall be, 4140 steel bar 4” (101.6mm) wide x 3/8”
(9.5mm) high with black zinc finish. Rail shall disperse the
wheel point loads to structural slab. Rail shall have two
permanently mounted floor anchors maximum 15” (381mm)
on center. Rail shall be installed recessed into concrete slab
and flush to top of concrete slab. Rail and carriage design
allows concrete slab to be unlevel at the following maximum
variation of 3/16” (4.8mm) variation over any 2’ (0.6m) rail run
and 1/4” (6.4mm) maximum variation over any 10’ (3.04m)
rail run.
MOBILE CARRIAGE BASES:
Assembled structural steel carriage base will have a minumum
capacity of 16,000 lbs. (7,257 kg) per single and 32,000 lbs.
(14,514 kg) per back-to-back rack section. On back-to-back
configurations, individual wheel assemblies must be connected
with an articulated carriage base/rack flue spacers in order to
have the system track and transfer the rack loading equally to
all carriage wheels. Each wheel assembly shall be equipped
with two wheels, minimum 6” (152mm) diameter steel wheels.
Wheels are equipped with two permanently lubricated
and shielded radial ball bearings. Wheel capacity 8,000 lbs
(3,628kg) each. Wheels have solid steel axles of 1-3/8” in
(35mm) diameter. Wheels shall be dual flange, all wheel
guided. All carriage sections between wheel assemblies
have integral cross bracing to maintain accepted tolerances
for function of systems. Side profiles shall provide and
maintain wheel assembly alignment and squareness. These
profiles shall be pre-drilled at the factory but are bolted, and
assembled on the job site as integral carriage members.
Wiring shall be routed through an enclosed housing channel
to protect the electronic wiring harness. Structural steel side
profiles shall be minimum 6.165” (157mm) high, 8 gauge
(4.2mm). Finish shall be powder coat paint. Structural bases
shall be placed back to back with minimum 6” (152mm) clear
flue between back-to-back carriages.
POWER & CONTROLS:
System power requirements - 120 VAC single phase input.
Powered carriages shall be equipped with ¼ HP; 90-volt
DC gear motors. Multiple carriages shall be moved with a
single activation of a carriage control and/or via an infrared
or RF remote. Each carriage shall be equipped with one
or more ¼ HP, 90-volt DC gear motors, depending on load
rating. Each independent drive shall be synchronous and
current limiting to maintain proper alignment through closed
loop motor feedback and control on all individual motors
within the carriage regardless of length or weight load and
eliminate racking and binding. Motor and motor control-
lers shall provide for soft-start/soft-stop movement, current
limiting, and automatic time-out. Carriage movement to be
selectable between sequential to minimize power demands
on start-up, or block movement for faster access Motors and
power train shall provide for maximum carriage travel speed
of 3” (76mm) per second. All power transfer to wheels to be
done by chain drive. Power to mobile units provided by an
overhead buss bar system. Communication between
carriages is provided by overhead cable festoon. Power
supply to be provided by others.
SAFETY FEATURES:
The following safety features are to be provided: Photoelectric
safety sweep scanning the full length of both sides of each
carriage. The sweep will prevent or immediately stop move-
ment if an obstruction is encountered or the beam is broken.
Photoelectric aisle entry sensor shall be positioned at each
entry location. The aisle entry beam will prevent or imme-
diately stop movement if an obstruction is encountered or
the beam is broken. Status of the safeties to be displayed on
the control unit. Stop pushbutton shall be provided at each
aisle control. A warning horn shall be provided whereupon
activation of an aisle movement pushbutton it will sound for
the first 3 seconds of carriage movement. A flashing yellow
warning light is provided on the carriage ends that will flash
during system movement.
3.8 
