National Crane Published 03-18-2019 Control # 582-04 3-15
NBT30H-2 OPERATOR MANUAL CONTROLS AND OPERATING PROCEDURES
RATED CAPACITY LIMITER
RCL System Description
The Rated Capacity Limiter (RCL) is an operational aid that
warns the operator of an impending dangerous condition that
could result in death or injury to personnel and/or damage to
equipment and property.
The RCL is not a substitute for good operator judgment,
experience, and safe operating procedures. The
responsibility for safe crane operation remains with the
operator.
The Manitowoc RCL system consists of an operator’s
console, anti-two block switch, length sensor, angle sensor,
slew potentiometer, four outrigger length sensors and two lift
cylinder pressure transducers. The maximum load/actual
load is displayed on the operator screen and the load part
number is displayed on the error codes screen. When a load
is picked, the RCL compares the actual conditions with the
load chart. If an overload condition is sensed, audible and
visual warnings are generated and the Boom Down,
Telescope Out, and Hoist Up controls are disabled. These
are the functions that worsen the overload condition.
Components:
• RCL display is mounted on an adjustable arm that can
be positioned to either the passenger-side or the driver-
side of the operator’s control console.
NOTE: The RCL display is not intended for frequent
removal as damage may occur to the electrical
connector. Removing the display will result in a
check engine light illuminating in the truck dash.
• Length/angle sensor with cable reel mounted on the
under side of boom.
• Lift cylinder pressure transducers located inside the
turret.
• Anti-two block (A2B) switch on the boom nose.
• Slew sensor inside the frame mounted to the bearing.
• Outrigger length string potentiometer mounted inside
each outrigger beam.
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