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2.3.3 MOMENT LIMITER OPERATION AND CANCELLING (RECOVERY)
The moment limiter is a device that is provided for measures available for an emergency case. In actuality,
any operations relying on the device will incur danger.
Pay sufficient attention during operations so that the crane will not stop automatically.
[1] PROHIBITED OPERATIONS AFTER AUTOMATIC STOP
If the crane has stopped automatically due to overload, the following crane operations are
prohibited.
Disobeying this rule may cause critical danger due to tipping of the machine or breakage of the
boom, for example.
• Boom lowering operation • Boom hoisting operation • Boom extending operation
• Hook hoisting operation
[2] RECOVERY OPERATION FROM AUTOMATIC STOP
When an automatic stop occurs, recovery cannot be performed unless you lower the load
capacity ratio to the safe region of less than 90% (tri-colour revolving working status lamp:
green).
If the moment limiter displays the load factor of 90% or more, be sure to perform crane
operations carefully by turning the engine speed to low speed.
Performing crane operations at a high engine speed could cause critical danger; in this case,
the hoisted load will waggle resulting in overload, which could lead to tipping of the machine or
breakage of the crane, for example.
When load factor is “less than 90%”
When the hoisted load is less than 90% of the rated total load, the
green colour of the rotating warning lamp which shows a normal
use condition turns on.
For a load capacity ratio: 90% or more and less than 100%
In the case of lifting loads being 90% (warning alarm) of the
Rated Total Load, the illuminated green revolving working status
lamp turn yellow, and an alarm goes off intermittently to notify
operators or people around that the lifting load is approaching the
Rated Total Load.
For a load capacity ratio: “Greater than 100%”
If the hoisted load exceeds 90% (prediction alarm) of the rated
total load and the hoisted load becomes 100% or more of the
rated total load by further continuing crane operations, the
tri-colour revolving working status lamp changes from the yellow
colour to the red colour, the alarm sounds continuously and
subsequent crane action stops automatically.
•
Hook hoisting • Boom extension • Boom lowering • Boom hoisting
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Страница 56: ...48 SAFETY LABEL LOCATIONS 2 2...
Страница 59: ...51 24 Machine Mass 542 4773100 28 Working Radius Rated Total Load Chart 542 3582200...
Страница 60: ...52 30 Safe Operation 557 3494500 31 Operating the Moment Limiter 542 2250000...
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Страница 251: ...243 2 SPECIFICATION DIMENSIONAL DRAWING...
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Страница 262: ...254 3 MONITOR INDICATION 1 Searcher hook selector switch 2 Searcher hook position display...
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