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 moment load 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 hook 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 moment load ratio (load ratio) 100% stop status, the dangerous operation judgment is disabled. The dangerous operations with moment load 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 slewing (when a capacity change occurs due to the differential outrigger slide extension status, the capacity of slewing destination is smaller than present hook load)