Elliott Digger Derrick, Operation & Maintenance Manual, Page: 309 / 376

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W450321A 09/12
6.4 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.