Advanced Amplifiers AA-28G-2KW-PT Podręcznik użytkownika - Strona 10
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Drukuj stronęThe STANDBY button illuminates and the OPERATE button is extinguished. Front panel display
shows "Standby" on the status bar again.
Power TWTA Off:
After placing the TWTA in STANDBY press WARM UP button to power-down the TWTA.
If the TWTA was operating at high-duty the amplifier should be run in STANDBY an additional length
of time to allow the TWT to cool.
Reset:
If any monitored parameter falls outside the limits set in the processors, the Main processor interrupts
pulses and disengages the high voltage supplies in a fashion similar to STANDBY but latches the
system in RESET. The RESET button is illuminated and the front panel display status area shows the
word "Reset" and the Home screen lists the faults which triggered the RESET, together with values
latched at the moment the fault occured.
After the cause of the fault has been corrected press the RESET button to return the TWTA to
STANDBY.
TWT Temperature, cooling fans, cover Interlock, VSWR and Helix Current are all directly monitored
by the Main Control and will cause the Main Control processor to place the TWTA in RESET if the
amplifier is in WARMUP, STANDBY or OPERATE.
Heater Voltage and Current, Drive Voltage, Collector Voltage and Current, Body Voltage and Cathode
Current are all directly monitored by the RF Control. Collector Voltage and Body Voltage will not
trigger a fault until the TWTA is in operate. Heater Current and Heater Voltage will not trigger a fault
during a specified time after the unit was turned on.
Grid Voltage and the RF Control Board +9V supply are handled uniquely; they are monitored by the
RF Control processor but will initiate a Flashing Reset.
Flashing Reset:
FLASHING RESET indicates a fault which needs the Main Control board to turn the unit off to prevent
serious damage.
The following events will trigger the Flashing Reset.
Grid voltage out of range or the RF Control Board +9V supply too high. High +9V supply or high grid
voltage (absolute value) will cause a FLASHING RESET at any time while low grid voltage will cause
a FLASHING RESET only in WARM UP or STANDBY. Low grid voltage in OPERATE will not cause
a fault.
When there is an unexpected behavior of Main Control Board or RF Control Board firmware which
trigger a watchdog to reset the microcontroller. After such a reset, the unit will immediately go to
FLASHING RESET.
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