GREER Company
1918 East Glenwood Place
Santa Ana CA 92705
Page 21 of 44
MicroGuard
®
586 Operation/Setup Manual
W458200 REV C 10/29/02
3
Routine Checks and Maintenance
Extension Reel
The extension reel houses the reel-off cable to the boom tip, a cable from the extension reel to the computer,
and the boom angle sensor. The extension reel provides the following signals that are sent directly to the
computer via the extension reel computer cable.
•
Boom Extension Signal – generated within the extension reel, and controlled by the reel-off cable, as the
boom is extended or retracted. The extension reel measures the boom extension and provides a signal,
which enables the computer to calculate the operating radius of the crane, the weight of the actual load, and
the percent of rated capacity.
•
Two-Block Signal – transmitted from the boom head, through the reel-off cable, to the extension reel and
the extension reel cable to the computer. This signal becomes active when the anti-two-block switch opens,
indicating a two-block condition. When this signal reaches the computer, it causes an immediate display of a
flashing light and an audible alarm on the operator’s display console, and the motion cutouts are activated.
•
Boom Angle Signal – is generated within the extension reel, and designed to measure the angle of the
boom relative to the horizon.
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