Maeda MC285C-3 - Over Winding Detector; Moment Limiter Working Envelope Setting

Section 4 – MOMENT LIMITER (OVERLOAD DETECTOR) Mini-Crawler Crane M A E D A
4-74 1/2019 MC285C-3
Over Winding Detector
CAUTION: Sudden Movement Hazard. Always
pay attention to the distance between the
hook block and boom when raising the hook.
Extending the boom also raises the hook
block. Always check the hook block height
when extending the boom.
When the hook is overwound, raised or the boom
is extended:
Fig. 4-203
1 - Hook Block
2 - Over Winding Detector
3 - Weight
4 - Boom
If the hook block (1) is raised or the boom (4)
extended, the over winding detector (2)
intermittently activates the alarm buzzer to warn
the operator of overwinding if the hook block
approaches the end of the boom and pushes up
the weight (3).
At the same time, the raising of the hook block and
the extension and raising of the boom stop
automatically.
When an alarm buzzer sounds, move the winch
lever immediately to LOWER or move the boom
telescoping level to RETRACT to lower the hook
block.
For more information on control during stoppage
caused by over winding, see “Over Winding
Detector” on page 4-66.
Moment Limiter Working Envelope
Setting
WARNING! The following safety messages
address a potential Tip Hazard when using the
moment limiter working envelope:
• Always set the working envelope a safe
distance from obstacles. Verify the boom
will stop at the set position of the working
envelope before operating the crane.
• Always operate the crane at a low engine
speed. Do not operate the engine at any
speed other than low. Operating at any
engine speed other than low may cause the
boom to travel beyond the set position of the
working envelope.
If the boom working envelope is limited due to a
restricted working space, the boom working
envelope can be set to a desired value.
NOTICE: The display colours corresponding to
the various limit states are as follows:
• Blue: No limit setting
• Yellow: Limit setting conditions currently
selected
(Reverts to blue or orange if no operation is
performed within five seconds.)
• Orange: Limit set