M A E D A Mini-Crawler Crane Section 4 – MOMENT LIMITER (OVERLOAD DETECTOR)
3/2019 MC305C-3 4-71
Working Envelope Restriction Warning
When the working envelope gets close to the set
restriction value, a warning is issued to notify the
operator and people around of the situation.
The last status of the set value for the working
envelope restriction is memorised even if the
starter switch is turned to the OFF position.
NOTICE: See "Descriptions of Switches on
Moment Limiter Display" on page 4-65 for how to
set the value for working envelope restriction.
When the working envelope has been set, the
restriction will be as follows.
1. Safety Zone
• The appropriate working envelope restriction
LED (orange) lights up.
• Green of the working status lamp lights up.
2. Pre-Warning
• The appropriate working envelope restriction
LED (orange) lights up.
• The alarm bleeps intermittently.
• Yellow of the working status lamp lights up.
3. Limit Warning
• The appropriate working envelope restriction
LED (orange) lights up.
• Red of the working status lamp lights up.
• The alarm bleeps continuously.
• The hazardous operation of the boom stops
automatically.
Fig. 4-193
Over Winding Detector
CAUTION: Pay attention to the distance between
the hook and boom when raising the hook.
Extending the boom also raises the hook.
Always check the hook height when extending the
boom.
When you overwind the hook when raising the
hook or extending the boom,
• The "OVER WINDING" LED (red) flashes.
• The alarm bleeps continuously.
• The hook raising and boom extending operation
stop automatically.
• The voice saying "hook is overwinded" is heard.
In case of auto stop, immediately perform the
recovery operation.
Perform hook lowering and boom retracting
operations as recovery operations.
Fig. 4-194
Fig. 4-195
1 - Hook block
2 - Over winding detector
3 - Weight
4 - Boom
When the hook block (1) was raised or the boom
(4) was extended, the over winding detector
intermittently activates the buzzer to warn the
operator of over winding if the hook block (1)
approached the end of the boom (4) and pushed
up the weight (3).
At the same time, the raising of the hook block (1)
and the extension of the boom (4) stop
automatically.
When a warning buzzer sounds, operate the
winch lever immediately to the "LOWER" side or
operate the boom telescoping buzzer to the
"RETRACT" side to lower the hook block (1).
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