TM 9-4940-568-20
5-4
5-3.
DESCRIPTION AND DATA (Continued)
(3) OVERLOAD SHUTDOWN SYSTEM
SENSORS.
(a)
BOOM LENGTH SENSOR. The
boom length sensor is a length
potentiometer that measures and
sends a signal to the
microprocessor on how far the
boom is extended.
(b)
BOOM ANGLE SENSOR. The
boom angle sensor measures and
sends a signal to the
microprocessor on what angle the
boom is at.
(c)
TENSION LOAD CELL. The
tension load cell is a strain gage
that sends a signal of the load
exerted on the hoist at its pivot
point. It sends the signal to the
microprocessor which uses the
information to determine if an
overload condition exists. It works
in conjunction with the boom length
and boom angle sensors to initiate
an overload lockout signal.
(d)
HOIST LAYER SENSOR. The
hoist layer sensor is a proximity
switch that sends an ON/OFF
signal to the microprocessor
indicating the amount of cable that
has been spooled off of the hoist. It
will cause the microprocessor to
use a different calibration factor to
determine the actual load exerted
on the tension load cell.
