Series XT-50, XT-80, and XT-100 Amplifiers Operation 3-3
Clearing Faults
Faults can be cleared in two ways:
1. Cycle High Voltage OFF then ON.
2. Momentarily set the Fault Reset control line low.
If the fault condition occurs frequently, maintenance action is required.
Control and Status Signals
Control Signals
• AC Power ON. Connect Pin a to Pin W (ground) to turn the power amplifier
ON.
• High Voltage ON/OFF. This control signal turns the high voltage ON (control
line set low) or OFF (control line set high). The High Voltage ON signal
enables TWT amplification by turning the TWT electron beam on or off.
• Heater Standby. This control signal reduces the voltage applied to the TWT's
heater (ON = control line set low). (See Heater Standby Section for details).
Turning high voltage on overrides the Heater Standby command and returns
the TWT's heater voltage to its normal operating value.
• Fault Reset. This control signal resets the High Voltage fault and Helix
Current fault (reset = control line momentarily set to low).
Turning the High Voltage OFF also clears faults.
Status, Digital
• Helix/Arc Fault Latched. Indicates there is a helix/arc fault within the
amplifier. Status line goes low when fault occurs. See Chapter 3, Fault Mode
for details.
• Helix/Arc Fault. Indicates there is a helix/arc fault within the amplifier.
Status line goes low when fault occurs.
The amplifier will try to reset itself in the event of a helix/arc fault.
This line will 'blink' during each reset cycle.
• Heater Timer Complete. Indicates Heater Delay status. Status line goes low
when heater delay cycle is complete.
• TWT Temperature Fault. Indicates there is a TWT Temperature fault within
the amplifier. This is not a latched fault. The amplifier turns itself ON when
the TWT cools to an acceptable temperature.
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