Comtech EF Data HPCST-5000 - Manual (Page 124)

TWT Amplifiers High-Power TWTA Satellite Terminals
4–6 Rev. 1
4.1.3.2 Digital Status
1. Helix/Arc Fault Latched.
There is a helix/arc fault within the amplifier. Status line goes low when the fault
occurs. See Section 4.1.2.5 for details.
2. Helix/Arc Fault.
There is a helix/arc fault within the amplifier. Status line goes low when the fault
occurs.
Note: In the event of a helix/arc fault, the amplifier attempts to reset. This line
“flashes” during each reset cycle.
3. Heater Timer Complete.
Heater Delay status indicator. Status line goes low when the heater delay cycle is
complete.
4. TWT Temperature Fault.
There is a TWT Temperature fault within the amplifier. This is not a latched
fault. When the TWT cools to an acceptable temperature, the amplifier
automatically powers ON.
5. A TWT Temperature fault may be caused by:
a. Air intake filter clogged
b. Cooling fins clogged
c. Fan failure
d. Fan power supply failure
6. High Voltage ON.
High voltage system status indicator. Status line goes low when high voltage is
ON.
7. Fan ON.
The amplifier’s main cooling fan is on. The main cooling fan is controlled by the
temperature of the TWT. The fan cycles on and off in cooler ambient conditions.
To maximize fan life, the fan usually operates below the nominal voltage design.
Status line goes low when the fan is on.
8. High Voltage Fault.
A high voltage fault exists within the amplifier. Status line goes low when the
fault occurs. A high voltage fault is typically an indication of a serious power
supply failure.