CUSTOM TRUCK LOAD KING 25-92, Installation Manual

Page: 123 / 171

6.3 Sensor Baseplate Assembly
The sensor baseplate assembly supports and connects the extension and angles sensors. It also
supports the two-block switch signal and signal cable to the computer.
Electrical or mechanical failure of either the angle sensor or the extension sensor potentiometers
cannot be repaired in the field. The angle sensor pendulum is factory set on the potentiometer shaft
and the extension potentiometer gear contains a protection clutch which is difficult to replace in the field.
In the event of failure of either item, replace the entire sensor baseplate assembly.
The terminal block (TB1) mounted on the assembly provides wiring connection for all internal parts of
the reeling drum and Reel-to-Computer cable. Most electrical diagnoses of the boom sensors can be
made at this terminal block.
If problems occur with the two-block alarm operation, angle, or extension sensor, refer to the following
chart. Follow the Boom Position/Action column before performing any voltage checks. Measure all
voltages with a digital voltmeter set to DC volts range.
SIGNAL
BOOM
POSITION/
ACTION
VOLTAGE VOLTMETER CONNECTION
MIN MAX RED (+) BLACK (-)
SENSOR
DRIVE
- +4.7V +5.3V RED BLUE
ANGLE
SENSOR
OUTPUT
0 degrees 0.4V 0.6V GREEN BLUE
EXTENSION
SENSOR
OUTPUT
0 ft. FULL
RETRACTED
0.15V 0.35V WHITE BLUE
TWO-BLOCK
DRIVE
A2B WEIGHT
DOWN
5.5V 7.5V BLACK BLUE
A2B WEIGHT
UP
9.5V 10.5V BLACK BLUE
TWO-BLOCK
SIGNAL
A2B WEIGHT
DOWN
5.5V 7.5V BROWN BLUE
A2B WEIGHT
UP
0V 2V BROWN BLUE