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[5] CHECKING OVER HOIST DETECTOR FOR OPERATION
Over hoist the hook block (1), and raise the hook with winch and
extend the boom, and verify that the buzzer sounds intermittently,
the hook raising operation and boom extending operation stop.
If these events do not happen, the over hoist detector (2) may be
faulty.
If the alarm does not stop, the over hoist detector (2) may be faulty
or the circuit may be open.
Ask us or our sales service agency for repair.
[6] CHECKING MOMENT LIMITER FOR OPERATION
If you find any abnormality with the moment limiter, immediately contact us or our sales service
agency.
1. Turn the starter switch to the ON position.
2. Check the working status lamp. All 3 colors light for approximately 3 seconds first, then only the green
light keeps lighting.
3. Check the moment limiter display unit.
Verify that no error code is displayed at the “RATED TOTAL LOAD” display on the display panel.
4. Start the engine and operate the crane as follows to verify if the moment limiter properly displays the
value.
Crane Operation and Displayed Parameter
Value Displayed on
Moment Limiter
Displayed “boom length” with the boom length at minimum
Displayed “boom length” with the boom length at maximum
Displayed “working radius” with the boom length of “4.7 m” and boom angle
of “50 degrees “
5. Prepare a standard weight of known actual mass. Hoist it to ensure that the displayed "real load" value
is the identical to the total masses of the standard weight and the sling instrument. Take note, however,
that slight error may appear due to a certain condition of the boom.
6. Operate the crane until the moment limiter display values indicate the boom length is "4.7 m" (4.7 m
boom) and boom angle is "50 degrees", and then measure the "boom angle" and "working radius.
If the measured value(s) differ from the moment limiter display value, contact us or our sales service
agency.
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