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W301-0411E
Chapter B
Chapter B
User Mode
9.3 Interlock Stop
9.3.1 Cancel Contents
The table below shows the relationship between the automatic stop function and cancel availability described in
"6.1 Cause for AML Automatic Stop Output." (Including items that are not applicable depending on models)
Table 9.3.1 Relationship between automatic stop function and cancel availability
Stop function name
Stop function at AML
cancel
Elevation lower limit
¯
Elevation upper limit
¯
{
: Stop function enable
¯
: Stop function disable
9.4 Overload Cancel
When the status 1 or 2, specific to large-sized crane, is entered at load moment ratio (load ratio) 100%
stop, this function aims to return the crane to the safe side.
1 During the insertion operation into the indoors, when the lifted load reaches 100% while the boom is being
extended and the lifted load is being adjusted by winch hoist-down, the retraction and hoist-up operation
will need to be performed at the same time for the recovery operation (the winch hoist-up is recognized as
the dangerous operation). Therefore, the overload cancel becomes required.
2 During the operation with the boom raising, when the 100% stop is performed due to a physical contact of
boom top with an obstacle {if the elevation is raised with boom contacted against an obstacle, the
pressure becomes high at the tube (extension) side, resulting in the increase of detected hoist medium
load}, the elevation lowering will be needed for recovery operation (the elevation lowering is recognized
as the dangerous operation). Therefore, the overload cancel is required.
9.4.1 Cancel Contents
In the load moment ratio (load ratio) 100% stop status, the dangerous operation judgment is disabled.
The dangerous operations with load moment ratio (load ratio) 100% stop are as follows:
- Main winch hoist-up
-
Auxiliary
winch hoist-up
- Boom elevation lowering
- Boom telescoping extension
- Right and left swing (when a capacity change occurs due to the differential outrigger slide extension
status, the capacity of swing destination is smaller than present hoist medium load)
