OPERATING CONTROLS AND PROCEDURES GRT880 OPERATOR MANUAL
3-40 Published 3-25-2020, Control # 643-04
enabled (note that based on past limitation settings,
alarms may begin at this point).
7. Use the Right Arrow function twice to skip the Limitation
Value and then highlight the Accept Crane Position
symbol (refer to Table 3-4:). Use an OK button (item 2,
Figure 3-18) to accept the current crane position (such
as the 11.7 ft value shown in Figure 3-21) to be the
Limitation Value. The Limitation Value should now be
updated on the screen. Note that the boom is now at the
limitation, so alarms are most likely sounding. The boom
can now be moved away from the current tip height to
cease the alarm. Refer to Table 3-2: for how the alarm
performs. Refer to Figure 3-18 for the button to cancel
an audible alarm (once boom motion has stopped).
8. The Height Limitation is now defined and enabled.
Crane operations can be resumed with the WRL working
with this specified limitation.
Height Limitation Procedure by Value
To define and enable the Height Limitation using a “typed in”
value of tip height as the limitation, the following steps can be
used:
1. The Height Limitation Screen (Figure 3-21) is to be
shown on the display.
2. Use the Right Arrow function once to highlight the
Enable symbol (refer to Table 3-4:).
3. Use an OK button to set the symbol to the limitation
being enabled - it will have the green color when
enabled (note that based on past limitation settings,
alarms may begin at this point).
4. Use the Right Arrow function once to highlight the
Limitation Value. Use an OK button to begin entering the
value. Use the Up Arrow or the Down Arrow to change
the value (in tenths) to the desired tip height value. Use
an OK button (item 2, Figure 3-18) to finish entering the
value. Note that the boom may now be at the limitation
(depending on the value entered), so alarms may be
active. The boom can now be moved away from the
current tip height to cease the alarm, if needed. Refer to
Table 3-2: for how the alarm performs when the lockout
option is not used. Refer to item 1, Figure 3-18 for the
button to cancel an audible alarm (once boom motion
has ceased).
5. The Height Limitation is now defined and enabled.
Crane operations can be resumed with the WRL working
with this specified limitation.
Height Limitation Disable Procedure
To disable an active Height Limitation, the following steps
can be used (note that turning off the power to the control
system also disables the WRL limitations):
1. The Height Limitation Screen (Figure 3-21) is to be
shown on the display.
2. Use the Left Arrow and/or Right Arrow function to
highlight the Enable symbol (refer to Table 3-4:).
3. Use an OK button (item 2, Figure 3-18) to set the symbol
to the limitation being disabled - it will not have the green
color when it is disabled.
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