Maeda MC-305C-2 - Page 145

3-79
[3] CRANE OPERATIONS
Standard Operation Sequence,
Machine Status
Display and Warning Activation of Safety Devices
Perform crane operations.
• Work selector switch “CRANE”
• Crane operation with levers
• Boom stowing lamp on display
panel OFF
• Actual work and the rated total
load are compared, and the
working status lamp lights up
according to the load factor.
• Load factor for illuminating working
status lamp
• Load factor less than 90 %:
Working status lamp (green) ON
• Load factor 90 to less than 100 %:
Working status lamp (yellow) ON,
alarm sounds intermittently.
• Load factor 100 % or more:
Working status lamp (red) ON,
alarm sounds continuously.
Moment limiter
• When the load factor reaches
100 % or more (overloaded),
hook raising, boom extending,
and boom lowering operation
stop.
When one of the outriggers go up in
the air during crane operation
• Setting lamps (red) on display
panel flash
Crane interlock device
• If any of the extension lamps
and setting lamps (total of
eight) goes off, hook raising,
boom extending, and boom
lowering operation stop.
When the hook was raised
excessively
• Alarm buzzer sounds continuously
Over hoist detector is
activated.
Hook raising operation stops.
When the hook was lowered
excessively
• Alarm buzzer sounds continuously
Tow block is activated.
Hook raising operation stops.
Rope warning is activated.
Hook lowering operation stops.
When the machine tilts for 3
degrees or more during crane
operation
• Alarm buzzer sounds continuously
Crane inclination alarm device
is activated
[4] CRANE STOWING OPERATION
Standard Operation Sequence,
Machine Status
Display and Warning Activation of Safety Devices
Operate the machine to take the
boom stowing posture.
• Fully retract the boom
• Boom horizontal stowing position
• Boom slew and stow position
• Boom stowing lamp on display
panel ON
Outrigger interlock device
• If the boom stowing lamp
(green) does not light up, all
the outrigger operations stop.