SUSPENDING LOADS OVER PEOPLE
The suspension of loads over people demands the highest
level of rigging knowledge, equipment, and equipment
maintenance. The UJC must be installed and used in
accordance to rigorous rigging standards required when
suspending loads over people. These include the following
important precautions.
1. It is preferred that the load always be tied off with auxiliary
chains or cables before access to the area beneath the load
is permitted. As an alternative, the system may be designed
such that malfunction or failure of one lifting motor’s load
bearing components does not cause load loss and/or
overloading of any other lifting motors in the system. Note
that in such a system, lifting motor performance and function
must be monitored visually or with the use of load cells.
2. Never operate the lifting motor while people are under
the load.
SAFETY INFORMATION
1. Follow all local electrical and safety codes, as well as the
National Electrical Code (NEC) and the Occupational
Safety and Health Act (OSHA) in the United States.
2. The lifting motor must be securely and adequately
grounded. The power pigtail includes a green lead for
grounding.
3. Be careful when touching the exterior of an operating
motor; it may be hot enough to be painful or cause injury.
With modern motors this condition is normal if operated at
rated load and voltage (modern motors are built to operate
at higher temperatures).
4. Protect the power and control cables from coming in
contact with sharp objects.
5. Do not kink the electrical cables and never allow them to
come in contact with oil, grease, hot surfaces, or chemicals.
6. Make certain that the power source conforms to the
requirements of your equipment.
7. Inspect the unit daily before operating lifting motor.
8. Cluttered areas and benches invite accidents.
9. The operator should not engage in any practice which will
divert his attention while operating the lifting motor.
10. Before using the lifting motor, the operator should be
certain that all personnel are clear.
11. Do not operate lifting motor with loads exceeding its rated
capacity.
12. Supporting frames or beams used as a lifting motor hanger
must have a greater load capacity than the lifting motor.
13. Do not attempt to operate lifting motor beyond normal
maximum lift range.
14. Align lifting motor for a straight line pull. Avoid side pull or
end pull.
15. Do not operate lifting motor with twisted or damaged chain.
16. Do not operate a damaged or malfunctioning lifting motor
until necessary adjustments or repairs have been made.
17. Do not use lifting motor to lift people or to carry loads over
people.
18. Do not leave a load suspended in the air unattended.
19. Always remove load before making repairs.
20. Do not remove or obscure capacity or warning decals.
INSTALLATION
POWER & CONTROL SYSTEM REQUIREMENTS
The UJC must be connected to a power and control system
that is properly designed to operate the lifting motor and to
handle the power consumption of the motor. Note the motor
amperages listed on page 3. Be aware that the instantaneous
current surge experienced when lifting is typically up to three
times the steady current. The unit has a control pigtail and
power pigtail for electrical connections. Control voltage is
115V as a standard (24V optional). Power conductors and
branch circuits connected to the unit should be adequate to
handle the current draw. This is especially important to
consider when a unit is wired for 115V (See Table 2, page 11).
PRELIMINARY CHECKS
Before installing the lifting motor, check the following:
1. After unpacking the unit, carefully inspect for any damage
that may have occurred during transit. Check for loose,
missing or damaged parts. Shipping damage claims must be
filed with the carrier. Be sure that the voltage labeled on the
unit matches your power supply.
2. Make sure all supporting structures and attaching devices
have the strength to withstand several times the weight of
the intended loads. If in doubt, consult a qualified structural
engineer.
3. Provide proper branch circuit protection for the lifting motor
as required by the prevailing electrical codes in your area.
4. Lifting motors should not experience voltage drops of more
than 10% of the supply voltage. It is critical to use adequate
sized power cables, especially with 1-phase models (See
Table 2). On dual voltage lifting motors, the installer must
ensure that the lifting motor is correctly wired for the
intended voltage (See WIRING, page 9).
5. ALWAYS DISCONNECT LIFTING MOTOR FROM POWER
SUPPLY before removing electrical cover or when making
any electrical connection in the lifting motor.
6. The user’s control board must be grounded in accordance with
the electrical codes that are applicable in your area. Power
cables to lifting motors must include a ground conductor. The
power pigtail includes a green grounding conductor.
7. The installation area must provide safe operating conditions
for the operator, including sufficient room for the operator
and other personnel to stand clear of the load at all times.
4
Always disconnect the power source before working
on or near a lifting motor or its connected load. If the
power disconnect point is out of sight, lock it in the
open position and tag to prevent unexpected
application of power.
Country Club Road
P.O. Box 779
Wadesboro, NC 28170 USA
TEL: (800) 477-5003
FAX: (800) 374-6853
For more information contact: Sievert Crane and Hoist, (708) 771-1600, [email protected], www.sievertcrane.com
