Instruction Manual
6X Series Liquid-Cooled Transmitter Chapter 4, Circuit Descriptions
Instruction Manual, Rev. 0 4-3
4.2 Power Controller/AC Distribution Assembly, Boards
4.2.1 Button Board (1311306)
The Button Board provides the front panel accessed push button switch which is
illuminated by multicolored LEDs. The switch lit Blue indicates normal operation.
When lit Red, indicates a malfunction has occurred. Pushing the button will cause
the front panel LCD on the system controller tray to display the operating
parameters of the selected power controller and/or the malfunction which has
occurred.
4.2.2 Power Supply Line Monitoring Board (1311312)
The power supply line monitor board monitors the voltage and current on each of the
incoming three phase AC lines from the input power connection. The measured
values are connected the power supply control board. The power supply line
monitoring board also has a 600V solid state relay mounted on it that drives the coil
of the power contactors.
4.2.3 Power Supply Control Board (1312059)
The power supply control board is mounted behind the front panel of the power
controller/AC distribution assembly. The power supply control board monitors
signals that deal with the transmitter’s power circuitry. The three incoming AC lines
voltage and current are monitored along with signals that pertain to the power
supplies. The power contactors are controlled from this board. The board contains a
local 5 VDC power supply that powers the logic contained on the board.
4.3: Power Amplifier Tray, Boards
4.3.1 (A1) Fan Power Supply Board (1312004)
The Fan Power Supply Board contains three power supplies, two identical +12 VDC
fan power supplies and a +32 VDC pre driver power supply. All three of the power
supplies are current mode flyback topology DC-DC type. The power supplies are all
short circuit protected. The fan power supply board is connected to the main +42V
Buss rail through a 3 Amp fuse. This fuse protected +42 VDC is also wired to the
Phase/Gain Board. There are clips containing two "spare" 30 Amp fuses located on
the Fan Power Supply Board which can be used to replace the fuses to the amplifier
pallets, if needed.
+5 VDC from the phase/gain board connects to the fan power supply board at J9-2.
The +5 VDC is connected to a 3.3V regulator IC U11 that takes the +5V input and
generates the regulated +3.3VDC labeled +3.3V that connects to rest of the board.
The Green LED DS1 is lit if the +3.3VDC is present on the board. The +5 VDC is
split on the board and connected out of the board at J6-3, which is cabled to the
bottom combiner board, at J5-3, which is cabled to the front panel button board, and
at J7-3, which is cabled to the bottom splitter board.
The board contains two PIC microprocessors, PIC 1, U7, for Fan 1 and temperature
and PIC 2, U9, for Fan 2 and the +32 VDC pre driver power supply, which monitor
the power supplies and communicate with the tray on Serial Data Line connections at
J5-2, J6-2, J7-2 and J9-1. The system controller for the transmitter monitors these
samples and determines if a power supply needs to be shut down. J8 is a