Selenia User Guide
Appendix B—The Mobile Selenia
MAN-03270 Revision 003 127
Appendix B
Appendix B The Mobile Selenia
This appendix provides information about Selenia systems installed in a mobile
environment.
B.1 General Information
B.1.1 The Vertical Position Override Switch (VPOS)
The Mobile Selenia has a Vertical Position Override Switch (VPOS) on the back of the
Gantry. This switch can start the Selenia if the C-arm is lower than its normal operating
position after rough-road travel.
Figure 84: Location of Vertical Position Override Switch (VPOS)
B.1.1.1 Background
Switches located in the Gantry limit the C-arm vertical travel to a pre-defined range.
When the C-arm reaches its highest or lowest point of normal travel, the switches engage
to stop further motion. If the C-arm should travel past the Limit switches (in the event of
switch failure or other electrical malfunction), a second switch engages that removes
power from the system. A Field Engineer would normally be contacted to repair and
restart the Selenia.
In a mobile environment (during transport), it is possible for the C-arm to 'creep'
downward and beyond the two Limit switches. If this occurs, the Selenia would be
disabled—the lower limit switch would engage, preventing the system from normal
start-up. This is not a failure condition that would require a Field Engineer's attention.
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