2-16
RATED CAPACITY LIMITER (RCL)
A rated capacity limiter (RCL) is installed on the crane to assist the operator in estimating
loads and measuring load radii. Following, are some operating tips.
Always be aware that the RCL can stop boom movement at capacity load conditions and in
two-blocking conditions. Use good judgment in controlling the speed of boom movements to
prevent shock loads and swinging loads.
If the RCL system stops the crane movement, there are various remedies that may be used
to restart operation. If the hook is two-blocked, it should be lowered using HOIST DOWN, if
safe to do so. BOOM RAISE OR TELESCOPE RETRACT may be used if this is safer.
If the load is the maximum for the load line or attachment, the load should be set down in a
safe place using the HOIST DOWN control and the load or attachment changed.
TELESCOPE RETRACT, SWING LEFT, or SWING RIGHT may also be used, if safe. DO
NOT USE THE BOOM RAISE CONTROL as this may increase the overload.
If the load is at the maximum allowable load radius, the boom can be raised or retracted to a
safe radius, or the load may be lowered to a safe place using HOIST LOWER. If the boom
extension is at its lower angle limit, the boom must be raised or the load hoisted down.
If there is a malfunction of the RCL or Anti-Two-Block system that causes loss of boom
movement and cannot be remedied by the procedures above, the override button on the
RCL display may be required to move the boom. The override button will provide an amount
of time (and a countdown for that time), to the operator, to get the load into a SAFE
POSITION.
W A R N I N G
We recommend the emergency override button be used with discretion. Improper or
careless use of this button can cause damage to the crane and endanger people and
property. The operator who uses this override in an emergency should use good
judgment.
To Next Page
Loading...
