SECTION 6 – ELECTRICAL
6-2 USTC January 15, 2001
the cable while permitting smooth cable extension
and retraction.
The counterweight suspension chain will have to be
adjusted according to the number of parts of lines
being used.
ELECTRICAL SYSTEM
The electrical system consists of a main electrical
box located at the rear of the pedestal. Power enters
the crane electrical system from the battery. A power
solenoid turns power to the crane functions on and
off. Usually, a signal wire from the PTO switch
ground operates the power solenoid through a relay.
This can vary, depending upon the type of PTO
installed.
Stacked terminal strips distribute power between the
various components located in the main electrical
box.
OVERLOAD SYSTEM
The overload system includes an optional shut-down
function on some models. The shut-down function
operates by activating a solenoid valve that dumps oil
to the reservoir.
The overload system monitors the pressure difference
between the extend and retract ports. If the machine
is overloaded, the system will not allow the machine
to boom down, boom up, telescope out or hoist up.
An override switch is provided to allow the boom up
function to operate, which may be needed in certain
situations.
LOAD MOMENT INDICATOR
Some models may be equipped with an additional
Load Moment Indicator (LMI). The LMI provides
load information such as load weight, load radius and
boom angle. Refer to the LMI documentation for
additional information.
Courtesy of Crane.Market
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