Totally enclosed, non-vented motor (TENV) is the
preferred motor for loading dock applications since
the motor is not run continuously and only for short
periods to raise the dock and extend the lip.
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Conform to NEMA MG 1 and continuous duty or 60-minute time rated,
industrial type, single speed rated for operating conditions. Provide
electrical insulation systems conforming to NEMA MG 1, Class B. Provide
permanently lubricated antifriction ball or roller bearings. Equip each
electrohydraulic loading dock leveler with a [totally enclosed fan cooled
(TEFC)] [totally enclosed non-ventilated (TENV)] squirrel cage induction
electric motor. Equip each air powered loading dock leveler with a 115v,
single phase, 60 Hz, self cleaning, two stage, UL approved industrial fan
motor, which will not exceed its rated capacity under full load conditions
of the loading dock leveler.
2.5.2
Controls
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NOTE: Controls are required for electrohydraulic
ramps. If dual controls are provided, the designer
will indicate the location on the drawings.
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NEMA ICS 2, size 0 controller for heavy industrial service. Provide an
electrically operated, full magnetic, nonreversing type controller for the
motor. Equip all control enclosures with locks and keys.
2.5.3
Totally enclosed, self-cooled, dry type. Feed the transformer from the
load side of the main disconnecting device. Incorporate circuit breakers
with ground fault interrupting protection conforming to UL 943.
2.6
ACCESSORIES
2.6.1
Dock Truck or Trailer Restraining Device
Self-aligning device. Mount this device as recommended by the manufacturer
to engage the ICC bar of the truck/trailer with a positive restraining
force of not less than 8150 kg 18,000 pounds. This device must be able to
service all truck or trailers having ICC bars located between 300 and 750
mm 12 and 30 inch above ground level (when truck or trailer is unloaded)
and recessed up to 225 mm 9 inch from the rear of truck or trailer.
Provide a means to protect the device from disabling damage in the event
that more than 8150 kg 18,000 pounds of force is exerted by the restrained
truck or trailer. Manually control activation and deactivation from inside
the building.
2.6.2
Dock Bumpers
Provide bumpers capable of sustaining repeated impacts from trucks or
trailers without damage to the dock, dock levelers, or bumpers.
SECTION 11161
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