Elliott Digger Derrick, Operation & Maintenance Manual, Page: 313 / 376

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W450321A 09/12
7.1 WAD/ISS Overview (If Equipped)
The WAD/ISS (Work Area Definition/Integrated Swing Sensor) incoporates a sensor housed in the
swing drive of the crane that measures the angle of the upper structure of the crane relative to its
carrier. The sensor measures the angle by counting electronic pulses on the target gear relative from
the zero point (set by the operator) in either a positive or negative direction. The conditioning box
translates the signal so it can be processed by the computer and shown in the information window of
the display console.
WAD/ISS Conditioning Box
The advantage of the WAD/ISS over a typical swing potentiometer is the swing potentiometer is housed
in the collector column and maintenance and/or removal is difficult. The WAD/ISS is a small unit
mounted directly onto the swing drive and is easily accessible.
During normal operation, faults detected with the WAD/ISS will be shown on the display unit. During
such fault conditions the red “Overload” LED will flash accomapnied by an intermittent audible beep.
Additionally, the swing angle display will “ERROR” as well as the information window showing an error
condition message. All swing related operator alarms, work area alarms, etc, will be displayed.