Diagnostics
Stator Control
The X-ray tube’s anode must rotate whenever the system generates X-rays to prevent damage to the anode. System software
rotates the anode by applying start and run voltages to the stator winding on the X-ray tube. It also removes the run voltage from
the stator winding when there have been no inputs to the system for five minutes, and places a message in the
Generator
Events
log when this occurs. Software monitors a stator sense line to make sure the anode is turning when it should be, and
displays an error message if it is not.
Heat Calculations
Software performs regular checks on the X-ray tube anode and X-ray tube housing to prevent damage from high temperatures.
This monitoring occurs both during and after X-rays. Software calculates anode temperature based on technique and duty cycle,
and monitors a hardware thermistor on the X-ray tube housing. Since anode temperature cannot be measured directly and must
be calculated, it is possible to “fool” the software under certain circumstances by removing and reapplying system power while
the anode temperature is high. This may result in miscalculation of anode temperature and subsequent overheating.
Management Functions
System software manages several C-Arm functions, as described in the following paragraphs.
Disable X-Rays
Software monitors the state of the
X-Ray Enable Keyswitch
and several other parameters to determine when to disable X-rays.
When X-rays are disabled, software generates a message describing the reason why on the C-Arm Control Panels.
Perform Technique Lock
System Software asserts Technique Lock to prevent changes to kV, mA, and CCD Camera gain. Technique Lock also disables
ABS servo. Disabling Technique Lock causes the software to begin automatic adjustment of kV, mA, and Camera Gain while in
Auto Fluoro mode.
15
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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