Pre-Operation Inspection and Calibration Verification
© Hirschmann Rev. E 11/12/08 190147_E
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6 PRE-OPERATION INSPECTION AND CALIBRATION VERIFICATION
Before operating the crane, the following electrical connections must be checked to ensure that
the system is properly connected for the crane configuration.
6.1 MACHINES WITH ONLY A MAIN HOIST
If the crane works only with the boom and without boom extension, no additional connections
are necessary. However, be sure the weight of the anti two-block switch is properly installed on
the main hoist load line. With even parts of hoisting line, the weight shall be attached to the
dead-end line. With odd parts of hoisting line, the weight shall be attached to the line of lowest
speed.
If the crane works with boom extension, the connecting cable shall be installed between the
junction box on the boom extension and the boom junction box. The weight attached to the main
hoist anti two-block switch shall be removed. In that case the anti two-block switch has to be
locked with the red Anti Two-Block Retainer, which is fixed with a red lanyard at the anti two-
block switch (described in the following pages). Then the weight shall be reattached to the
boom extension anti two-block switch.
Failure to re-position the anti two-block switch weight will prevent the overhoist
system from functioning properly. No weight shall be on the main hoist anti two-block
switch when the boom extension is being used.
6.2 MACHINES WITH MAIN AND AUXILIARY HOISTS
If the boom extension is not in the operating position, the by-pass plug shall be installed in the
main boom junction box. The weight of the main hoist anti two-block switch shall be installed.
If the boom extension is in the operating position, the connecting cable shall be installed
between the junction boxes on the boom extension and the main boom. Weights shall also be
attached to the anti two-block switches on both the main boom and boom extension.
If the boom extension is in the operating position and no load line is being used on main boom,
to prevent injury or damage to equipment, the weight shall be removed from main boom switch.
In that case the anti two-block switch has to be locked with the red Anti Two-Block Retainer,
which is fixed with a red lanyard (not shown) at the anti two-block switch.
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