5
INSTALLING THE LIFTING MOTOR
1. Be certain that supporting structures and attachment points
have the strength to withstand several times the weight of
the intended loads.
2. Hooks should be attached to appropriate points such that
the load will be applied at the saddle of the hook only. Never
allow a load to rest on the tip of a hook. Hook latches should
always close completely.
3. The UJC can be mounted upright or upside down.
4. Connect the controls to the lifting motor as shown in the
Wiring Diagrams starting on page 11. When installing a
three-phase lifting motor, check to make sure the lifting
motor travels in the direction intended when operating the
controls. To correct improper motor travel, reverse any two
wires (except the green ground wire) at the power source.
Do not change connections in the lifting motor. Once the
direction of travel is verified to be correct, permanent
connections can be made at the power source.
5. Once the controls are properly connected, run the motor in
the down direction to allow enough length of chain to attach
the load hook to its suspension point. Once again, you
should be certain of the structural strength at the attachment
point and ensure that the load will bear on the saddle of the
hook. The lifting motor should be permitted to align itself for
a straight line pull. Do not attempt to pull around corners.
6. Reset the limit switches to allow for only the amount of travel
required (See LIMIT SWITCH ADJUSTMENT, page 8).
7. It is imperative that no twists exist in the chain, especially on
double-reeved units. Chain twists can create hazardous
conditions! Twists occur when the 2-ton load block is
capsized or when the slack end of chain is not properly
attached at the side of the lifting motor.
8. If necessary, lubricate the chain, see LUBRICATION, page 9.
CHAIN BAG
(OPTIONAL ACCESSARY)
It is strongly recommended to use a chain bag with the UJC.
Chain bags like shown in Figure 1 are available from Coffing
Hoists. The bags, which are colored black, fit closely to the lifting
motor and are as inconspicuous as possible. Be sure to follow
the directions that come with UJC chain bags before installing.
OPERATION
This lifting motor is designed for operation within the limits of its
rated capacity. It is controlled by a user supplied control system
or a pushbutton station. The UP direction is controlled by
closing the circuit between X1 and C20. DOWN is controlled by
closing the circuit between X1 and C21 (See Figures 7A-7C).
OVERLOAD LIMITING PROTECTION
This lifting motor is equipped with a factory-calibrated overload
limiting clutch that will permit the lifting of loads within its rated
capacity, but will prevent the lifting of damaging overloads while
the lifting motor is being operated. If the load being lifted
exceeds the lifting capability of the overload clutch, the motor
will continue to run, causing overheating of both the clutch and
motor. This condition should be avoided by immediately
releasing the “UP” button and reducing the load to within the
rated capacity of the lifting motor. See GEARING, page 10,
for additional instructions on this device.
LIMITS OF TRAVEL
The UJC’s travel is limited by “UP” and “DOWN” limit switches
that should be adjusted for the application to prevent
dangerous conditions or incidents that could occur with
overtravel. The operator should be aware of the location of the
load at all times. If the extreme limits are encountered, the user
should immediately stop the motor.
With properly set limits, tandem units can be synchronized by
easing each one to its corresponding limit. Depending on the
application, you will use the “UP” or “DOWN” limit as your guide.
OPERATING NOTES
Here are some points which must be observed to maintain
proper operation.
1. Do not overload the lifting motor.
2. Do not make extreme side pulls with the lifting motor.
3. Do not sling the lifting motor load chain around an
attachment point. Use a proper sling.
4. Before raising a load, always check to see that it is held
securely in the hook or sling chains, etc. Raise the load
only until the load chain is taut and then double check the
Do not attempt to store more chain in a chain bag
than outlined on its instruction sheet or serious
damage to the lifting motor may result and hazardous
conditions may be created.
The overload limiting clutch is an emergency
protective device and should not be used to measure
the maximum load to be lifted, or to sense the
overload imposed by a constrained load. While the
overload limiting clutch will protect the lifting motor
from damaging overloads, it will not ensure that a
load is within the rated capacity of the lifting motor.
Figure 1 - UJC
With Optional
Chain Bag
Do not use lifting motor to lift, support or otherwise
transport people.
Do not purposely allow the overload limiting clutch to
slip. Excessive slippage will damage the clutch and
motor. Hazardous conditions will be created!
Product Codes:
UJC927-3
70 ft Chain Capacity
UJC927-4
120 ft Chain Capacity
Country Club Road
P.O. Box 779
Wadesboro, NC 28170 USA
TEL: (800) 477-5003
FAX: (800) 374-6853
Note: UJC4008
uses twice the
amount of chain
than the
single-reeved
models.
For more information contact: Sievert Crane and Hoist, (708) 771-1600, [email protected], www.sievertcrane.com
