RATED CAPACITY LIMITER NTC55 OPERATOR MANUAL
7-2 Published 9-26-2018 Control # 646-02
RCL SYSTEM DESCRIPTION
The Rated Capacity Limiter (RCL) is an operational aid that
warns the operator of an impending dangerous overload
condition that could result in death or injury to personnel and/
or damage to equipment and property.
The National Crane 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 RCL has the crane load
charts loaded into the RCL module and are displayed on the
screen as needed. 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 (main and auxiliary) controls are disabled. These are the
functions that worsen the overload condition.
Components:
• RCL display on the operators console.
• Length/angle sensor with cable reel mounted on side of
boom.
• Lift cylinder pressure transducers integral to lift cylinder
hold valve.
• Anti-two-block switch (ATB) on the boom nose.
• Four outrigger length sensors (one on each outrigger
beam).
• Slew sensor on the swivel.
WARNING
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 RCL is not a scale and should not be relied upon
solely to accurately weigh loads.
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