OPERATING CONTROLS GRT655/655L OPERATOR MANUAL
3-10 Published 3-23-2020, Control # 654-04
RCL Early Warning Indicator
The RCL Early Warning Indicator (6, Figure 3-5) is located
immediately below and to the right of the Rated Capacity
Limiter Display Module (RDM) screen.
The RCL Early Warning Indicator comes on (amber) when
the RCL senses a lift that is between 90% to 100% of
capacity for the programmed crane configuration.
Anti-Two-Block Indicator
The Anti-Two-Block Indicator (7, Figure 3-5) is located
immediately below and to the right of the Operator Display
Module (ODM) screen.
The Anti-Two-Block Indicator comes on (red) when the anti-
two-block system is triggered. When a two-block condition
occurs, the crane control system will lock out the hoist up,
boom down, and telescope out crane functions, which would
worsen the two-block condition. The anti- two-block system
locks out the system prior to a two-block condition occurring.
Swing Brake Engaged Indicator
The Swing Brake Engaged Indicator (8, Figure 3-5) is
located immediately below and to the right of the Operator
Display Module (ODM) screen. The indicator comes on
(amber) when the swing brake is applied and the indicator
goes off when the swing brake is released.
The swing brake is automatically released when the swing
controller is actuated and the swing brake is automatically
applied when the superstructure stops rotating.
Brightness Sensor
A Brightness Sensor (9, Figure 3-5) is located immediately
below and to the right of the Rated Capacity Limiter Display
Module (RDM) screen and the Operator Display Module
(ODM) screen.
The Brightness Sensors sense the amount of light in the
operator cab. As the amount of light inside the cab changes,
the Rated Capacity Display Module screen and the Operator
Display Module screen will brighten and darken
automatically, making the screens easier for the operator to
see.
Internal Temperature Warning Indicator
An Internal Temperature Warning Indicator (10, Figure 3-5)
is located immediately below and to the right of the Rated
Capacity Limiter Display Module (RDM) screen and the
Operator Display Module (ODM) screen.
When the ignition key switch is turned to the I (RUN) position
and the internal temperature of either the RDM or the ODM is
below -30°C (-22°F), the related module’s Internal
Temperature Warning Indicator will come on (blue) and the
module’s screen will remain blank. When the ignition key
switch is turned to the I (RUN) position and the internal
temperature of either the RDM or the ODM is above 70°C
(158°F), the related module’s Internal Temperature Warning
Indicator will come on (red) and the module’s screen will
remain blank.
For the RDM and ODM screens to come on, their internal
temperatures must be between -30°C (-22°F) and 70°C
(158°F).
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