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W301-0411E
Chapter B Chapter B
User Mode
B-7 AML Control
7.1 Backward Stability Stop Function
7.1.1 Outline of Function
The backward stability stop function prevents the overturning of crane to the direction opposite to the boom side
(backward) by the weight of counterweight (C/W) and other components.
Unlike the overload stop and anti-twoblock stop, the stop cannot be canceled with this function.
7.1.2 Restriction Contents
When the boom elevation angle goes over the backward stability performance, a warning code "W0012" is
displayed regardless of the operation. Also, the crane stop output is performed while the crane is operated
toward the critical side exceeding the stability performance.
The critical side operations are as follows:
(1) Boom retraction
(2) Elevation raising
During the stop output, the code "W0025" is displayed.
Even after the stop output condition is canceled, the stop output is maintained for 2 seconds. In order to
suppress the hunting at performance limit, hysteresis is considered in the boom elevation angle judgment.
7.2 Working Range Limit Stop Function
7.2.1 Outline of Function
The working range limit stop function specifies the working range where the crane entry by operator is prohibited,
and performs the crane stop output when the crane is operated to enter the specified area. The area is specified
by the copying method (the crane is actually operated to before the entry prohibition area, and then the range
limit position is set at the position). The following 6 working range limit stops are performed.
(1) Boom height (lifting height)
(2) Boom upper limit angle
(3) Boom lower limit angle
(4) Load radius
(5) Right swing limit (Note)
(6) Left swing limit (Note)
Note: The swing hydraulic circuit adopts a route different from that of other operations, and no stop is performed
with the main pumps relief valve’s unload. Consequently, the stop is performed by the output of solenoid
proportional valve that is connected to the pilot pressure line for swing operation. Therefore, the swing range
limit works only the models equipped with the solenoid proportional valve for swing operation.
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