Chapter 4: General Information
5495975-1EN Rev.9 4-7
© 2013-2017 General Electric Company. All rights reserved.
System Interlocks
Your system has a series of interlocks that can place the system in an exposure hold state. When certain
conditions exist outside of normal operation, the red LED on the user interface becomes lit.
Grid Interlock
If the Grid interlock is activated, the Exposure Hold icon will appear on the OTS user interface and at the
Acquisition workstation screens. Select the Exposure Hold icon for detailed description on the inhibit con-
dition.
Automatic Exposure Control (AEC) Interlock
If the tube is not centered laterally and longitudinally on the center ion chamber, the Exposure Hold icon
may appear on the OTS user interface and at the Acquisition workstation screens. If the tube is not cen-
tered laterally and longitudinally on the center ion chamber, the Exposure Hold icon for detailed descrip-
tion on the inhibit condition.
OTS Position Interlock
When the X-ray field is outside of the receptor area and/or not in lateral or SID detents, the Exposure
Hold icon will appear on the OTS user interface and at the Acquisition workstation screens. Select the
Exposure Hold icon for detailed description on the inhibit condition.
Note: This interlock is no longer active when the tube angle is > +/- 10 degrees.
Tube Pivot Interlock
The Tube Pivot interlock LED illuminates when the tube pivot must be rotated to 0 degrees (normal posi-
tion).
Free Cassette Interlock
When in Free Cassette mode (using CR or film for Table top receptor) the detector drawer in the table
must be pulled out to release the optical sensor that recognizes that the cassette is in place, or the detec-
tor must be removed completely. If the Free Cassette mode is selected without releasing this optical sen-
sor, the Exposure Hold icon will appear on the OTS user interface and at the Acquisition workstation
screens. Select the Exposure Hold icon for detailed description on the inhibit condition.
Table Finger Pinch Interlock
The table is equipped with optical sensors beneath the edges of the table between the emergency stop
button and table lock button on each side. The sensor stops lateral and longitudinal movement of the
table top if fingers or other objects are beneath the table edges, as shown in Figure 4-6.
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