OPERATING CONTROLS AND PROCEDURES GRT880 OPERATOR MANUAL
3-34 Published 3-25-2020, Control # 643-04
Table 3-2: Alarm Characteristics
Note that the audible alarm can be canceled. It is the Tab
button on the display. Refer to item 1 in Figure 3-18. It can be
canceled once the boom is no longer being moved. When
boom motion again becomes apparent in the control system,
the audible alarm will be restored.
When a limit is reached, the Main Screen shows an indicator
for this condition (again in addition to audible alarms and
potential effects on the crane functions). Figure 3-19 shows
the Main Screen example; the swing limit has been reached.
There are similar symbols for the other limitations; Table 3-3:
shows the boom up/down (boom angle) limitation active
symbol; the radius limitation active symbol; the height
limitation active symbol; and the wall limitation active symbol.
If there are multiple limitations active (such as a swing
limitation and a height limitation), then the appropriate
symbols are cycled on the display with a time interval.
LIMITATION POSITION ALARM
Height Limitation 10 ft before limit Slow beeping
5 ft before limit Fast beeping
At limit Solid sound
Boom Up/Down 10 deg before limit Slow beeping
5 deg before limit Fast beeping
At limit Solid sound
Radius 10 ft before limit Slow beeping
5 ft before limit Fast beeping
At limit Solid sound
Swing
A slow beeping alarm sounds when
the boom slewing
motion is actively monitored and limited by the WRL
system. A fast beeping alarm sounds when the boom
is within 5° of the swing limit. A solid tone sounds
when the swing angle limit is reached.
Virtual wall 10 ft before limit Slow beeping
5 ft before limit Fast beeping
At limit Solid sound
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