Grove Published 3-22-2021, Control # 702-02 4-111
GRT8120 OPERATOR MANUAL OPERATING PROCEDURES
Enable/Disable Switch (ON/OFF) Symbol - The Enable/Disable (ON/OFF) Switch Symbol with the
orange box indicates the Icon is active and can change. The box in orange next to the “I” would
indicate enabled. The orange box next to the “O” indicates disabled. This symbol is used for all of the
WRL Limitation Screens.
The gray Enable/Disable (ON/OFF) Switch Symbol or “O” without the orange highlight means the
switch is not enabled (or not active).This symbol is used for all of the WRL Limitation Screens.
Working Range Limiter (WRL) Swing Angle Enable Indicator (Green) - Indicates Swing Angle
Limitation Enabled (Active).
Working Range Limiter (WRL) Swing Angle Warning Indicator (Amber) - Indicates the swing angle is
within 10° of a swing angle limit set point. (Refer to Table 4-8 – WRL Alarm Characteristics).
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.
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
reasons, including how level the crane is and environmental conditions, such as wind speed.
Working Range Limiter (WRL) 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. This symbol is used for all of the WRL Limitation Screens.
Working Range Limiter (WRL) Boom Angle Indicator - Active.
Working Range Limiter (WRL) Boom Angle Indicator - Enabled.
Symbol Description
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