Grove Published 3-25-2020, Control # 643-04 3-43
GRT880 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
enabled (note that based on past limitation settings,
alarms may begin at this point).
7. Use the Right Arrow function once to highlight the upper
boom angle Accept Crane Position symbol (refer to
Table 3-5:). Use an OK button (item 2, Figure 3-18) to
accept the current crane position (such as the 39.9 deg
value shown in Figure 3-22) 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 boom angle to cease the
alarm. Refer to Table 3-2: for how the alarm performs
when the lockout option is not used. Refer to Figure 3-18
for the button to cancel an audible alarm (once boom
motion has stopped).
8. The Boom Up Limitation is now defined and enabled.
Crane operations can be resumed with the WRL working
with this specified limitation.
Boom Down Limitation Procedure by Crane
Position
To define and enable the Boom Down Limitation using the
crane current boom angle as the limitation, the following
steps can be used:
1. Position the crane to have the desired position.
2. The Boom Up/Down Limitation Screen (Figure 3-22) is
to be shown on the display.
3. Use the Left Arrow and/or Right Arrow function to
highlight the Lockout symbol (orange color; refer to
Table 3-5:). If this symbol is not shown, then only alarm/
warning option is available).
4. Use an OK button to change the lockout option to either
affect controls (including lockout), if desired, or to just
get warning indicators from the display. Again, this step
can be ignored if this symbol is not shown.
5. Use the Right Arrow function to skip the Boom Up
Limitation symbols and then highlight the Boom Down
Enable symbol (refer to Table 3-5:).
6. Use an OK button (item 2, Figure 3-18) 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).
7. Use the Right Arrow function once to highlight the lower
boom angle Accept Crane Position symbol (refer to
Table 3-5:). Use an OK button to accept the current
crane position (such as the 6.9 degree value shown in
Figure 3-22) 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 boom angle to cease the alarm. Refer to
Table 3-2: for how the alarm performs when the lockout
option is not used. Refer to Figure 3-18 for the button to
cancel an audible alarm (once boom motion has
stopped).
8. The Boom Down Limitation is now defined and enabled.
Crane operations can be resumed with the WRL working
with this specified limitation.
Boom Up/Down Limitation Disable
Procedure
To disable an active Boom Up or Boom Down Limitation, the
following steps are to be used (note that turning off the power
to the control system also disables the WRL limitations):
1. The Boom Up/Down Limitation Screen (Figure 3-22) is
to be shown on the display.
2. Use the Left Arrow and/or Right Arrow function to
highlight the desired Enable symbol (refer to Table 3-5:).
3. Use an OK button to set the symbol to the limitation
being disabled - it will not have the green color when it is
disabled.
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