Load Test Run - Mitsubishi Electric UM 5t Instruction Manual

Load Test Run

(A) Rated load test run
Hang a rated load, and lift and lower the load to check the effect of the brake. Run the hoist
over the whole length to make sure that the I-beam and trolley wire for nonconformities.
Then, conduct characteristic test and performance test.
(B) Overload test run
Hang a load of 125% of the rated load, and lift and lower the load several times.
The hoist has been certified by carrying out overload test runs with a load of 125% before
shipment.
However, the user is recommended to carry out the overload test runs from the viewpoint of
safety because the installation of I-beam and other devices can be checked by this test. The
test is designed to check the mechanical strength of each part. The performance test shall be
carried out with the rated load.
(C) Adjusting the traversing brake
If the brake is too effective when traversing is stopped, load collapse may occur. On the
contrary, if the brake is not effective, the hoist may coast and cause an accident. Open the
steel plate cover of the traversing motor, and turn the bolt in the cover for adjusting the
traversing brake to an optimum force at which load collapse will not occur. The brake
adjustment range is 0% to 100% of the motor torque. Before delivery from our factory, the
brake is adjusted to 50%. (For a detailed description of the adjustment method, refer to the
"Traversing Electromagnetic Brake".)
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