73
MECHANISM OF MOMENT LIMITER
The moment limiter knows the current posture by the boom angle
meter and boom length meter and calculates “Rated total load” in
the current condition by further knowing the number of wire falls
(input by an operator).
When the load is actually hoisted at this time, the moment limiter
calculates the “actual load” (hoisted load) according to the
pressure value from the pressure sensor of the derricking
cylinder section. The moment limiter makes comparison and
calculation on “Rated total load” and “Actual load” (hoisted load)
that were calculated in the current figure. Then, it issues an alarm
if the result is as follows: “Rated total load / Actual load = 90 –
100%”.
If the calculation result is “Rated total load / Actual load = 100% or
more”, the moment limiter issues an alarm and at the same time
automatically stops the boom operation.
The overload stop accuracy satisfies the stop accuracy of the
following formula by slowly lowering the boom.
Stop
accuracy =
A - B
× 100 < +10%
B
Where, A: Total weight of suspended load + hook + hoisting attachment
B: Rated total load of working radius (actually measured radius) where the boom stopped due
to overload
MOMENT LIMITER ERROR MESSAGE DISPLAY
The moment limiter displays an error code on the machine monitor to notify the operator if an abnormality
occurs in the boom angle meter, boom length meter or pressure sensor, if wiring is cut, if connectors
come off etc.
If any error code is displayed, immediately stop using crane.
For error codes, causes of abnormalities and remedial action refer to “8.5 List of Error Codes”.
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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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