Section 6 - Fault Isolation
6-47
X-ray controller is not generating system timing interrupts
[E_INTERLOCK_INHIBIT_I]
Comment: There have been at least two consecutive system clock ticks (approximately
1/10 second) without any A/C line frequency interrupts from the X-ray
controller.
Action: Verify that the X-ray controller current fuse on the operator console is not
"popped". If it is, push it in. If it continues to pop, repair or replace the X-
ray tank. The E_EMERGENCY_STOP_I error also turns off power to the
X-ray controller and thus disables the A/C line interrupts. Follow the
procedure under E_EMERGENCY_STOP_I to clear this condition first.
Refer to the
No A/C Line Interrupts
header, page 6-17 in this section.
X-ray firing order is out of sequence [E_XRAY_SEQUENCE_I]
Comment: The X-ray pulse level reading from the C-arm did not match the expected
level (i.e., the C-arm driver has a "template" for each X-ray pulsing mode
and if the actual pulse level does not match the template for the given X-ray
mode, it generates this error).
Action: If the filter drum and X-ray generator are out of sync, it is often difficult to
determine which is at fault. Verify that the filter drum is synchronized with
the A/C line and that the X-ray modes are correctly defined in
SQDRIVER.INI. The set screw and/or the belts on the filter drum assembly
may need adjustment (in addition to the two drum pickoff segments). To
aid in diagnosing the problem, disable the filter drum and X-ray hi/lo
monitors in SQDRIVER.EXE (remember to re-enable them before you
leave the program). Another problem that may occur is that the X-ray
filament thermal overload has tripped. To check this, turn on X-rays in
SQDRIVER.EXE and verify that the
XraySignalLevel
readback is
changing (and does not read zero). If it reads as zero, wait 2-3 minutes for
the thermal overload condition to clear itself and then try again. To see if
the X-rays are pulsing properly, turn off the filter drum and then turn on X-
rays.
X-ray signal level (hi/lo) did not match the filter drum position
[E_XRAY_PHASE_I]
Comment: If the filter drum monitor is enabled and the filter drum is on, this error
indicates that the filter drum wheel readback did not match the expected
value (i.e., there must be six segment readbacks, there must be eight pulses
within each segment and the first four pulses in each segment are required to
be brass and the second four are required to be air).
Action: See the discussion under E_XRAY_SEQUENCE_I.
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