120 20195-100 Preliminary
Paragon4 – UHF, 700, & 800MHz User Manual
13
3.1.5 Power Supply Modules (T809)
Figure 9 - Dual T809 Power Supply Module (black front plate)
Two horizontally mounted switched-mode pulse-width modulated T809 power supply modules are used
but not connected in parallel.
Both power supply units have an ON-OFF switch* and one LED indicator on the front panel plus an out-
put voltage adjust potentiometer (13.8 VDC nominal, 13.5 to 18 VDC) accessed via the back panel.
*
To remove voltage from the power supply PCB, disconnect the main power cords.
Their circuit protection features are:
•
Inrush current limiting
•
Over-current (short-circuit)
-
37 to 48A constant current limiting
-
Reset = auto recovery
•
Over-voltage
-
18 to 21 VDC = shutdown
-
Reset = Power OFF and ON
•
Over-temperature
-
shutdown of output voltage
-
auto recovery with temperature reduction
-
temperature sensed on transistors and diodes
Front Panel Indications
Power Switch
Illuminates when the unit is connected to AC power and
voltage is available
ON LED
- Lights bright green when voltage output is normal
- Lights faint green when module has entered over-
current mode
- Green LED is OFF, but power switch is ON indicates
module has shut down due to over-temperature or over-
voltage conditions.
Dual Power Supply Module
Power
Power
ON
ON
