5-8 Published 3-23-2020, Control # 654-04
SET-UP AND INSTALLATION GRT655/655L OPERATOR MANUAL
Checking Before Operation
Check the following electrical connections before operating
the crane to make sure the Rated Capacity Limiter (RCL)
system is properly connected for the crane configuration.
Cranes with Main Hoist Only
If the crane is operated only with the boom and without boom
extension, no additional connections are necessary. It must
however be made sure that the A2B switch weight is
correctly mounted on the main boom hoist rope. With even
numbers of rope lines, the lifting limit switch weight shall be
attached to the “dead end” of the hoist rope. With odd
numbers of rope lines, the lifting limit switch weight shall be
attached to the rope line with the lowest operating speed.
If the crane is operated with a main boom extension, the
connecting cable must be mounted between the distributor
socket on the extension, and the distributor socket on the
main boom. The main boom A2B switch weight must be
disconnected and mounted on the extension or fly section
A2B switch.
Cranes with Main and Auxiliary Hoists
If the main boom extension or fly section is not used, then the
bridging plug must be plugged into the distributor socket on
the main boom and the lifting limit switch weight must be
mounted on the main boom.
If the crane is operated with a main boom extension and the
main boom is equipped with a hoist rope, then the
connecting cable must be mounted between the distributor
socket on the extension or on the top section and the
distributor socket on the main boom. In addition, weights
must be fitted to both the A2B switch of the main boom and
the extension or fly section.
If the boom extension is in working position and if the main
boom is not equipped with a hoist rope, then the A2B switch
on the main boom must be placed into its locked position.
After electrical connections have been checked to make sure
the system is properly connected for the respective crane
configuration, the following checks must be made:
1. Check electrical wiring connecting various parts of the
system for physical damage.
2. Check A2B switches and weights for free movement.
3. Inspect RCL cable drum for smooth running, initial drum
tension, and correct cable winding.
Check A2B switch warning light and acoustic alarm as
follows:
1. Position boom over front of crane.
2. Manually raise weight fitted on the A2B switch. As soon
as weight is raised, the acoustic alarm should sound and
the A2B warning should display (refer to Figure 3-5).
3. Using the main hoist, pull hook block slowly against the
A2B switch weight. As soon as the hook block raises the
weight, the acoustic alarm should be triggered, the A2B
warning should display, and the main hoist should switch
off. Lower the hook block slightly to eliminate this
condition.
4. Slowly lower the boom to bring about a potential two
block situation. As soon as the hook block raises the
weight, the acoustic alarm should sound, the A2B
warning should display, and boom lower should switch
off. Lower the hook block slightly to eliminate this
condition.
5. Slowly extend (telescope out) the boom to bring about a
potential two block situation. As soon as the hook block
raises the weight, the acoustic alarm should sound, the
A2B warning should display, and the telescoping
function should switch off. Lower the hook block slightly
to eliminate this condition.
6. If crane is equipped with a boom extension, the
inspection procedure must be repeated for the A2B
switch of the extension.
WARNING
The following tests must be performed with care to
prevent personnel injury or crane damage. Proper
functioning of the Crane Control System (CCS) requires
successful completion of these tests before starting work.
If the operator cannot see the hook block approaching the
boom nose, this task must be assigned to an assistant.
The crane operator must be prepared to stop the crane
immediately if the CCS is not working correctly, that is
when the warning indicators do not display, the acoustic
alarm does not sound, and the crane movements such as
raising, extending and luffing are not disabled.
WARNING
If warning indicators and audible alarm do not function as
described and crane movements are not switched off, the
system is not working properly. The malfunction must be
corrected before starting work.
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