Maeda MC815C, Operation Manual, Page: 136 / 426

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1.5.7 OVERRIDE SWITCH
Override switch has a function to disable the moment limiter.
For about 3 minutes from this switch is turned ON, the crane does not automatically
stop with the moment limiter and is very dangerous. Any crane operation in such
conditions may result in dropping of the hoisted load, breakage of crane boom, and/or
machine tipping, and may cause a serious accident resulting in death or serious injury.
Use this switch only when the moment limiter, which detects the crane conditions, fails
or a load test of the crane is conducted. Key for the switch must be detached during
normal operations.
In particular, never perform the following uses.
• Never wind up the hook to hoist a load while this switch is turned to the “ON” position.
Even
if the weight of hoisted load exceeds the rated total load, the moment limiter cannot
detect it, and could result in dropping of the hoisted load, boom breakage or machine
tipping due to cutting of the winch wire rope.
• After the moment limiter detects that the rated total load is exceeded during crane
operation and automatically stops the operation, do not perform hoisting operation,
boom lowering operation and boom extension operation while the operation stop
function is cancelled by turning this switch to the “ON” position. Such operation may
cause boom breakage and machine tipping.
• Use the hook storage switch when stowing the hook. If this switch is turned ON to
perform hook hoisting operation, automatic stop is not made in an over winding
condition.
Use this switch only when the moment limiter fails or a load
test of the crane is conducted.
•ON : Insert the key into the switch. Turn the key clockwise
to “ON” position once, and operation stop function is
cancelled.
•OFF : The key can be removed or inserted at this position.
NOTES
The machine condition becomes like the following when
the operation stop function is cancelled.
• The red lamp of the rotating warning lamp turns on.
• The LED of the switch box lights up.
• The buzzer sounds continuously.
• The icon will be displayed on the monitor.
• Boom lowering speed and boom extending speed slow
down.
If the switch is turned to “ON” position once, the moment
limiter function remain cancelled even the switch is
returned to “OFF” position, unless 3 minutes is passed or
engine key is turned to “OFF”.
However, these behaviors are subject to change
depending on the status of the Machine body.
1.5.8 TROUBLESHOOTING FOR MOMENT LIMITER
If an abnormality occurs in the moment limiter, an error code appears on the monitor to alert the
operator to the occurrence of an abnormality.
For details about the error codes, refer to “OPERATION 11.7 LIST OF ERROR CODES”.