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ORTHORALIX 9200
Service Manual
3.27.CHP. OVER CURRENT
The current passing through the power transistors mounted on the
converter board PQ1 is measured by a Hall sensor, connected to
the microcontroller of the converter board itself.
The relevant circuitry corrects the kV control loop and, in case of
excessive current, temporarily inhibits the converter electronics
and generates an alarm to the interrupt line of the microcontroller.
The microcontroller disables the converter electronics, and
communicates the alarm to the host board PC1; in consequence of
that, the X-ray emission is stop by disactivating the START_XRAY
line. It waits for a reset before starting a new exposure sequence.
Possible cause:
(1)
converter board PQ1 defective
(2)
tubehead defective.
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The alarm is captured and stored as soon as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
3.28.CONVERTER: INV.OVER CURRENT
The current passing through the power transistors mounted on the
converter board PQ1 is measured by a Hall sensor, connected to
the microcontroller of the converter board itself.
When the absolute maximum current limit has been exceeded, the
converter electronics are immediately and permanently inhibited
(latched condition) and a system OFF/ON sequence is required to
cancel the alarm.
During the error condition, the alarm message is displayed on the
display and the control panel is disabled.
Possible causes:
(1)
converter board PQ1 defective
(2)
tubehead defective.
W
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To reset the alarm, switch the system OFF and then ON again.
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3.29.BACK UP TIMER
The back-up time is counted by the microcontroller mounted on the
converter board PQ1.
The host board PC1 informs the microcontroller on the converter
board about the actual exposure time.
The microcontroller on the converter board sets itself to an exposure
time limit about 20 % longer.
When the DEAD_MAN line is on (exposure command by the
operator), the integration of the effective X-ray time is enabled, by
counting the time during which START_XRAY is on.
If the limit is exceeded, the microcontroller on the converter board
disables the converter electronics stopping the X-ray emission
and communicates the alarm to the host board.
The host board disactivates the START_XRAY line, resets the alarm,
and waits for the DEAD_MAN command to be released, before a
new exposure sequence is started.
Possible causes:
(1)
converter board PQ1 defective
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(2)
host board PC1 defective.
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The alarm is captured and stored as soon as it as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm (if expired).
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F-11
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