Manitowoc Grove GRT8120, Operator'S Manual

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OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-108
Published 3-22-2021, Control # 702-02
also done with the screen and buttons on the ODM, as well
as possibly operating the boom to define particular locations.
With the limitation enabled and defined, the control system
can then provide the needed feedback and warnings based
upon the defined limitations. When the crane is in such a
position to cause warning, then the WRL Limitation is
considered to be ACTIVE.
In summary, to turn on a WRL Limit, the following steps must
be performed:
1. Enable the Limitation
2. Define the Limitation
When a limitation is enabled (but none are active), the ODM
shows a green-colored alert indicator icon on it Main Screen
(as shown below).
When a limitation is active, but the boom has not yet reached
t h e r e q u e s t e d l i m i t p o s i t i o n , t h e O D M s h o w s a n
amber-colored alert indicator for the limitation (as shown
below). In this condition, audible alarms, as well as slowing
of the crane functions (if Lock-Out Function used) will also be
apparent. For example, in this condition, the amber-colored
Warning Indicator Icon shown below would appear for the
swing limitation:
The warning buzzer slowly beeps when the swing angle is
within 10° of the swing angle limit set point and changes to a
fast beep when the swing angle is within 5° of the swing
angle limit set point.
For cranes that are equipped with the WRL Lock-Out
Function, when the swing angle is within 10° of the swing
angle lock-out set point, the swing function commanded by
the controller may be reduced or suspended depending
upon the weight of the load and the swing speed.
When a limitation is active, and the boom has reached the
requested limit position, the ODM shows a red-colored alert
indicator for the limitation, again with a symbol for the
particular type of limitation (refer to Figure 4-108 for the WRL
Menu Icons). In this condition, audible alarms, as well as
stopping of crane functions (if Lock-Out Function is used) will
also be apparent. For example, for this condition, the
following red Icon (shown below) would appear for the swing
limitation:
If there are multiple limitations enabled, such as a swing
l i m i t a t i o n a n d a h e i g h t l i m i t a t i o n , t h e i n d i c a t o r s
(15, Figure 4-70) will alternate, showing one after the other
in the ODM.
When a limitation is active, the warning buzzer inside the cab
will sound. If there is a solid sound, this will signify being at
the limitation.
The Alarm Characteristics are outlined in Table 4-8.
Icon Description
Working Range Limiter (WRL) Indicator
(Green):
Indicates one or more working
range limiters are defined.
Icon Description
Swing Angle Warning Indicator (Amber):
Indicates the swing angle is within 10° of a
swing angle limit set point.
WARNING
Due to the free-swing characteristic of the crane’s
superstructure, the boom and load can potentially swing
past the swing angle set point, even if the swing function
commanded by the controller is reduced or suspended
(locked out) by the WRL. This can happen for several
r e a s o n s , i n c l u d i n g h o w l e v e l t h e c r a n e i s a n d
environmental conditions, such as wind speed.
Icon Description
Swing Angle Stop Indicator (Red):
Indicates the swing angle is at a swing angle
limit set point. The warning buzzer is on
(constant).
For cranes that are equipped with the WRL
Lock-Out Function, the swing left or swing
right crane function is locked out, depending
upon which limit is reached.