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• Upper and lower fiberglass head carriage tracks.
• A drive motor that is within the cable end support.
• Motor belt reduction pulleys and pneumatic solenoid head separation clutch that is
within the cable end support.
• An upper and lower system of head drive belts and supporting idlers and pulleys.
• A belt tension adjustment where the drive belts connect to the upper and lower head
carriages.
Head movement monitoring and control
The scanner is equipped with various switches that monitor and control head movement. Table 5-1 lists
the switches and their functions. These switches are mounted to the upper and lower beams.
Switch
Present
Limit
Crash
Emergency
stop (E-Stop)
Figure 3 Head Drive system (scanner 4022)
Provides a permanent fixed reference to the motor
controller software to update the head position. Identifies
pproximate mid-beam position of head movement.
a
Alerts you if a head exceeds the horizontal-movement
limit. The heads should not come within pproximately
14.0 in (355.6 mm) of the cable or motor end supports
Stops all scanning and alerts the computer that a head has
passed a limit switch and come within aproximately 12 in
(304.8 mm) of the end supports
Disables the scanning motor controller and disables
sensor activation (where applicable) when pushed by an
operator.
Function
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