Comtech EF Data HPCST-5000 - Manual (Page 131)

High-Power TWTA Satellite Terminals Controller for Single Thread Systems
Rev. 1 5–3
5.1.1 LOCAL Control Configuration
When the LOCAL control configuration is selected (switch is down), all HPC-1200 front
panel controls and indictors are enabled.
5.1.2 REMOTE Control Configuration
When the REMOTE control configuration is selected (switch is up):
•
The HV ON/OFF switch of the HPC-1200 front panel is disabled.
•
The HEATER STANDBY switch of the HPC-1200 front panel remains active.
Setting the HIGH VOLTAGE switch on overrides HEATER STANDBY.
•
All front panel status indictors and monitors are enabled.
5.1.3 Controls and Indicators
The HPC-1200 front panel controls, monitors, and indicators are summarized in
Tables 5-1 through 5-4 and pictured in Figures 5-3 through 5-6. Refer to the Chapter 4
for a description of TWTA operating modes.
Table 5-1. Monitor Point and Lamp Test Descriptions
Key
# Nomenclature Type Function
1 GND jack Pin Jack Common ground for monitor outputs.
2 +15 VDC jack Pin Jack +15 VDC at 100 mA available for external use.
3 HELIX CURRENT
monitor Pin Jack Voltage proportional to helix current. 1V output (DC)
equals 2 mA of helix current.
4 HV MONITOR
monitor Pin Jack Voltage proportional to cathode voltage applied to the
TWT (1000:1 ratio). 1V (DC) equals 1000V DC applied
to cathode.
5 TEMP ANALOG
monitor Pin Jack Voltage proportional to TWT collector temperature. See
Figure 5-7 for calibration.
6 LAMP TEST
switch Momentary toggle
switch When pressed UP, forces all front panel LEDs to light.