Manitowoc GROVE RT890E Operator's Manual page 59

RT890E
The luffing jib ON/OFF switch must be in the ON position.
Push the luffing jib RAISE/LOWER switch to the LOWER
position and hold until the extension is lowered to the desired
position or a switch-off point is reached.
To lower the extension at the remote stations, press switch
2402 at the extension adapter or switch 2404 at the head of
the base section.
Operational Aids
WARNING
Electronic equipment on this crane is intended as an aid
to the operator. Under no condition should it be relied
upon to replace the use of capacity charts and operating
instructions. Sole reliance upon these electronic aids in
place of good operating practices can cause an accident.
Load Moment Indicator (LMI) System
The Load Moment Indicator (LMI) is an electro-mechanical
sensing system designed to alert the crane operator of
impending capacity when the system has been properly
preset by the operator. The control panel is mounted in the
front console of the operator's cab. When an overload
condition is sensed, the system provides the operator with a
visual and audible warning, and locks out the control levers
to prevent lowering the boom, extending the boom, or raising
the main or auxiliary hoist cables.
Three additional features are included within the LMI system:
• Swing Angle Set Limitation
• Work Area Definition
• Anti-two Block Device
Swing Angle Set Limitation allows left and right swing
angle to be preset. When the preset angle is reached, the
system will provide an audible warning.
Work Area Definition allows the crane operator to describe
the crane's working area by setting up "virtual walls". They
are referred to as virtual walls because they exist in the
system and are not real walls. The virtual walls represent
obstacles (i.e. buildings, towers, poles, etc.) in the crane's
working range. They are set by defining points along the
outer limits of the working area with the tip of the boom. Once
the working area has been defined, the system will provide a
visual and an audible warning if the boom approaches a
virtual wall.
CAUTION
When defining virtual wall(s), always allow a safe working
distance to any obstacles. Never work outside a safe
working area as defined by common practice, standards,
and manuals.
OPERATING CONTROLS AND PROCEDURES
There are no cutouts associated with the swing angle set
limitation or the work area definition features.
An Anti-Two Block Device is also incorporated into the
system to prevent the hook block or headache ball from
coming into contact with the boom nose or boom extension.
This condition will also cause a lockout of hoist up, boom
down, and telescope out, and also provide a visual and an
audible alarm.
Refer to the LMI Operator's Handbook for more detailed
information on the function of the LMI system.
Control Lever Lockout System
The control lever lockout system consists of hydraulic
solenoid valves (located in the directional control valves)
which are in series between the hydraulic remote control
valves in the cab and the pilot-operated directional control
valves. When the valves are actuated, they prevent pilot flow
between the hydraulic remote control valve in the cab and
the appropriate directional control valve. The valves are
activated in such a manner as to prevent worsening the
condition, i.e. boom down, telescope out, or hoist up. The
control lever lockout system is used with the anti-two-block
system or the load moment indicator (LMI) system.
Stowing and Parking
Never park the crane near holes, or on rocky or extremely
soft surfaces. This may cause the crane to overturn,
resulting in injury to personnel.
When parking the crane, do the following:
1. Park the crane on a stable surface.
2. Remove the load from the hook.
3. Stow the swingaway boom extension, if erected.
4. Fully retract the boom and position it in the normal travel
position.
5. Engage the swing brake and/or swing lock pin.
6. Retract all stabilizer cylinders and outrigger beams.
7. Apply the parking brake.
8. Put all operating controls in the neutral position.
9. Position the CRANE FUNCTION switch to OFF.
WARNING
WARNING
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