Broderson IC-20-1J, Operation And Maintenance Manual

Page: 32 / 63

2-18
OPTIONAL EQUIPMENT
RATED CAPACITY LIMITER:
A rated capacity limiter may be installed on the crane to assist the operator in estimating
loads and measuring load radii. Please read the RCL Operation Manual and the
following information for complete instructions on operation of the system.
After starting the engine, always set up the correct Rated Capacity Limiter config-
uration. The operation of the RCL functions should be checked at the beginning of each
shift of operation, and it should be tested with a known load at least once a month as
described in the RCL Operation Manual.
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 the hoist
control, if safe. The boom raise and telescope retract may also be used if this is safer.
In some unusual circumstances it may be necessary to swing the boom before lowering
the load. If you are sure this will not cause an overload, you can swing the boom to a
safer position.
If the load is the maximum for the loadline or attachment, the load should be set down in
a safe place using the hoist lower control and the load or attachment changed.
Telescope retract may also be used and swing may be used, if safe, as described in the
preceding paragraph. 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 the hoist control.
If the boom is fully lowered until it stops, (about 0°) the RCL will show an overload
condition because the boom lift pressure sensors cannot read a useful pressure in this
condition. To remedy this, raise the boom slightly. On the other hand, if the boom is
fully raised, (about 75°) the RCL may show an overload condition because the pressure
in the boom lift cylinder is sensed to be an overload. To correct this condition, the
override key may be turned and held and the boom lowered just slightly. Then check for
other conditions before lowering further.
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 key on the
dashboard may be required to move the boom.
Courtesy of Crane.Market