Kato SR-300L, Instruction Manual

Page: 203 / 233

- 187 -
18-6-2 Slewing control when a "slew-restricted region" is specified in the ACS
(611A-0049-0E)
If a certain slewing region is specified as restricted in the ACS, such as to avoid hitting obstructions when operating on
sites with limited working space or avoiding electrocution from nearby power lines, the "slewing stop system" will
function in the follow sequence to avoid an accident.
(1) Deceleration warning and corresponding slewing position
When slewing reaches the warning point, which is back-calculated from the slew-restricted point (angle), a voice
warning message "Caution when slewing" is emitted (1 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. Then when slewing approaches the restricted region, a warning
chime ("DING DONG", "DING DONG", …
) is emitted (intermittently) to notify the operator that the stopping
system is functioning.
If the control lever is moved in the opposite direction while slewing decelerates (before automatically stopping),
slewing will stop, then when the slew position starts moving away from the restricted region, the warning sound
will stop.
If the voice warning message "Caution when slewing" is emitted and slewing begins
automatically slowing down, try to stop slewing manually before reach reaching the slew-
restricted region by operating the slewing lever in the opposite direction, while paying attention
to the movement of the load.
Waiting for slewing to stop automatically could result in not stopping properly and overrunning
the overload point if the machine is not level or if there is a strong wind, which could cause the
crane to hit obstructions or electrocution.
(611A-0050-0E)
(3) Automatic stop and corresponding warning
When slewing reaches the point
(angle) immediately before the
slew-restricted region, slewing will come to a smooth stop and
emit a voice warning message "Slewing limit reached" (1 time). A
warning chime ("DING DONG", "DING DONG",
…
) begins
sounding (intermittently) just before stopping to notify the operator
the stopping system is functioning. If the control lever is operated
in the opposite direction and the crane begins slewing away from
the restricted region (angle), the warning chime will stop.