Maeda CC423S-1, Operation Manual

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[7] OVERRIDE SWITCH
The maintenance switch has the function of disabling the moment limiter function.
While this switch is at the “ON” (cancel) position, the crane does not automatically stop by the
moment limiter, falling into very dangerous conditions. Any crane operation in such conditions
will result in dropping of 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, failures or
when a load test of the crane is conducted. Key for the switch must be detached during normal
operations.
In particular, never use in the following ways.
• When lifting a load, do not hoist the hook while turning this switch to the “ON” (cancel)
position.
Even if a load of hoisted load exceeds the rated total load, the moment limiter cannot detect
it, resulting in dropping of hoisted load, boom breakage and 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 turning this switch to the “ON” (cancel)
position. Such operations cause boom breakage and machine tipping.
• Use the hook storage switch when storing the hook. If the override switch is used when
performing hook hoisting operation, automatic stop is not made even in an over-wind
condition.
Use this switch only when the moment limiter fails or a load
test of the crane is conducted.
• ON (Cancel):
Insert the key into the switch. Turn the
key clockwise and retain the key at that
position. The activation stop function is
canceled while the key is maintained at
the ON position.
The key automatically returns to the
“OFF” (Automatic) position when you
release your hand.
• OFF (Automatic): The operation stop function is enabled
at this position and the key can be
inserted and removed.
NOTES
If this switch is placed in the “ON” (Cancel) position, the
red lamp of the tri-colour revolving working status lamp
turns on.