Kato PREMIUM CITYRANGE CR-200RF, Instruction Manual

Page: 302 / 342

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Cr
ane
op
er
ation
24. Crane operation
24-6 Function of the "slewing stop system"
(T217161-058-0E)
When the outriggers are not fully extended, the "slewing stop system" functions by using the ACS to predict how much
the crane load will increase as it slews and when the crane is about to enter a region specified in the ACS as restricted
from slewing, then gently slowing the slewing movement and automatically stopping slewing before it causes a
dangerous situation, such as the crane becoming overloaded or entering a restricted region. However, this system will
not function properly unless it is level.
Crane status
Action of slewing stop
system
Remarks
All outriggers fully extended
Slewing will not stop
automatically
――――
Stationary crane-on-rubber or Pick and
carry
＊
Slewing will
automatically stop
――――
Outriggers unequally extended
Will not stop at correct
slewing position if machine
is not level
All outriggers equally extended, but only
partially extended or fully retracted
Slew-restricted region specified in ACS
＊
: Slewing may overrun and not stop at the correct position in strong winds.
(511A-0030-1E)
When the crane is operated in the stationary crane-on-rubber or pick and carry modes, the front
working area will become narrow. If the lever is operated suddenly, slewing may overrun.
Consequently, if working in these modes, pay attention to the ACS safety level bar graph display
and warnings and be careful to never overload the crane. Failing to use adequate caution and
continuing to slew the machine when overloaded could cause the crane to tip over and result in
tragic consequences.
(T217161-059-0E)
24-6-1 Slewing operations and system action
(511A-0031-2E)
Actions by the "slewing stop system" depend on the crane status
(
when overloaded or slew-restricted region is specified
in the ACS), as indicated below.
(1) Slewing control when overloaded
If the crane becomes overloaded when slewing from regions with a high lifting capacity
(safer) to regions with a
lower lifting capacity
(more dangerous)
, the "slewing stop system" will function in the sequence indicated below
to prevent the crane from tipping over.
1) Deceleration warning and corresponding slewing position
Continuing to slew will result in overloading the crane. Therefore, when slewing reaches a warning position
(slewing angle) back-calculated from the point where the crane is predicted to be overloaded, a voice warning
message "Caution when slewing" is emitted
(one time)
to warn the operator that slewing will be automatically
decelerated.
2) Slewing deceleration and corresponding warning sound
After the voice warning, slewing is decelerated and a warning chime ( "DING DONG DANG DONG,
…
"
) is
emitted ( continuously
)
as slewing approaches the slewing position where the crane will be overloaded, to notify
the operator that the system is functioning. While slewing is decelerating
(
before automatically stopping
), if the
control lever is operated in the opposite direction, slewing will stop and the warning chime will stop if the crane
is moved away from the overload point.