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W450769A 01/14
3.7.11 Sensor Baseplate Assembly
The Sensor Baseplate Assembly supports both the extension and angle sensors and connects the
sensors, the Two-Block switch signal to the slip-ring, and the signal cable to the system computer.
Electrical or mechanical failure of either the angle sensor or the extension sensor potentiometers may
not be field-repaired. The angle sensor pendulum is factory set on the potentiometer shaft, and the
extension potentiometer gear contains a protection clutch which is not field-repairable. If either item
fails, replace the whole sensor baseplate assembly.
The terminal block (TB1) provides wiring connection for all internal parts of the Reeling Drum and the
signal cable connecting the reel to the system computer. Electrical diagnoses of the boom sensors may
be made at this terminal block.
Figure 3.7.11 - SENSOR BASEPLATE ASSEMBLY
SIGNAL
BOOM
POSITION/
ACTION
VOLTAGE
VOLTMETER CONNECTION
MIN
MAX
RED (+)
BLACK (-)
SENSOR
DRIVE
-
+4.7V
+5.3V
TB1/4 - RED
TB1/1 - BLUE
ANGLE
SENSOR
OUTPUT
0 degrees
0.4V
0.6V
TB1/2 -
GREEN
TB1/1 - BLUE
EXTENSION
SENSOR
OUTPUT
0 ft. FULL
RETRACTED
0.15V
0.35V
TB1/3 - WHITE
TB1/1 - BLUE
TWO-BLOCK
DRIVE
A2B WEIGHT
DOWN
5.5V
7.5V
TB1/6 -
BLACK
TB1/1 - BLUE
A2B WEIGHT
UP
9.5V
10.5V
TB1/6 -
BLACK
TB1/1 - BLUE
TWO-BLOCK
SIGNAL
A2B WEIGHT
DOWN
5.5V
7.5V
TB1/5 -
BROWN
TB1/1 BLUE
A2B WEIGHT
UP
0V
2V
TB1/5 -
BROWN
TB1/1 - BLUE
Terminal Block TB1
Angle Sensor
Potentiometer
Shaft Mounting Collar
and Set Screw
Extension Sensor
Gear and Clutch
Extension Sensor
Potentiometer
Angle Sensor
Pendulum