Mini-Crawler Crane M A E D A Section 4 – FLY-JIB MOMENT LIMITER CONTROL
1/2019 MC405C-3 4-169
3. Boom angle approx. 76° (Boom angle
upper limit range)
While main-boom angle is within this range,
the indicator below on moment limiter
display will flash.
• Boom angle upper limit LED (18)
In addition, all the values shall be put out
except Boom angle display (1) and rated
load display (12). Also, Rated load display
(12) shall indicate "E-J".
Red light of working status lamp shall light
and rotate, also the warning buzzer beeps
continuously. Boom raising is automatically
interrupted, then.
In such event, lower the boom to the safety
range from restricted zone.
Boom raise operation shall be interrupted
until the boom is lowered and reaches the
safety range.
Fig. 4-504
4. Boom angle 57° to 55° (Lower marginal
range of boom angle)
While main-boom angle is within this range,
indicator below on moment limiter display
will flash.
• Boom angle lower limit LED (6)
At the same time the warning buzzer beeps
to warn the operator and others that the
boom is reaching its limit. (Boom angle
upper limit LED (18) will light and flash.)
5. Boom angle approx. 55° (Boom angle
lower limit range)
While main-boom angle is within this range,
the indicator below on moment limiter
display will flash:
• Boom angle upper limit LED (18)
In addition, all the values will be put out
except Boom angle display (1) and Rated
load display (12). Also, Rated load display
(12) will indicate "E-J".
The red light of the working status lamp will
light and the warning buzzer will beep
continuously.
Boom lowering and extending are
automatically interrupted, then.
(When the boom length is 12.5m or less, the
boom can be lowered for the purpose of
stowing boom.)
In such event, raise the boom to the safety
range from restricted zone.
Boom lowering operation shall be interrupted
until the boom is raised into its safety range.
Fig. 4-505
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