Grove Published 3-23-2020, Control # 654-04 4-79
GRT655/655L OPERATOR MANUAL OPERATING PROCEDURES
Swing Limitation Procedure by Crane Position
To define and enable the Swing Limitation using the crane
position to indicate the swing left and right limitation, the
following steps can be used:
1. Position the crane to have the desired swing angle
position for the swing left limitation.
2. The Swing Limitation Screen (Figure 4-46) is to be
shown on the display.
3. For cranes configured with both the Alarm/Warning
Function and the Lock Out Function, choose the desired
function by doing the following:
a. By default, the Lock Out Function is selected. If this
is the desired function, skip to Step 4. If not, use the
Left Arrow or Right Arrow function to highlight the
Lock Out Function symbol.
b. Use the OK button (item 2, Figure 4-40) to change
the Lock Out Function option to the Alarm/Warning
Function option.
4. Use the Right Arrow function to highlight the Enable
symbol (refer to Table 4-9).
5. 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).
6. Use the Right Arrow function once to highlight the swing
left Accept Crane Position symbol (refer to Table 4-9).
Use an OK button to accept the current crane position
(such as the 68.4 deg value shown in Figure 4-46) to be
the Limitation Value. The Limitation Value for swing left
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 swing angle to stop the alarm. Refer to Table 4-4
for how the alarm performs. Refer to Figure 4-40 for the
button to cancel an audible alarm (once boom motion
has stopped).
7. Position the crane to have the desired swing angle
position for the swing right limitation. If lock out option is
being used, past settings may prevent swinging to the
next desired limitation position. The over-ride switch
would be used to allow the motion, if this is acceptable.
8. Use the Down Arrow function once to highlight the swing
right Accept Crane Position symbol (refer to Table 4-9).
Use an OK button to accept the current crane position to
be the Limitation Value. The Limitation Value for swing
right should now be updated on the screen. Again, 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 swing angle to stop the alarm.
9. The Swing Limitation is now defined and enabled. Crane
operations can be resumed with the WRL working with
this specified limitation.
Swing Limitation Disable Procedure
To disable an active Swing 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 Swing Limitation Screen (Figure 4-46) is to be
shown on the display.
2. Use the Left Arrow and/or Right Arrow function to
highlight the Enable symbol.
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.
Swing Limitation with Lock Out Function Enabled
For cranes that are equipped with the WRL Lock Out
Function, when the swing angle is within 20° of the swing
angle lock out setpoint, the swing function commanded by
the controller may be reduced or suspended depending
upon the weight of the load and the swing speed.
Warning
Due to the free-swing characteristic of the crane’s
superstructure, the boom and load can potentially swing
past the swing angle setpoint, even if the swing function
commanded by the controller is reduced or suspended
(locked out) by the WRL. This can happen for several
reasons, including how level the crane is and
environmental conditions, such as wind speed.
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