NV30/NV40 Operations and Maintenance Manual Description
Issue 3.3 2014-12-10 Page 1-3
LVPS modules
See Figure SD-1 (A, B or C). LVPS modules A (U3) and B (U4) convert the ac input voltage to the
regulated low voltage dc supplies. The +5 V, +15 V and -15 V regulated outputs of the supplies are
ORed together at the control/interface PWB (A1) and applied throughout the transmitter.
+12 V power supply modules
See Figure SD-1 (A, B or C). +12 V power supply modules A (U1) and B (U2) convert the ac input
voltage to the regulated +12 V dc supplies. The +12 V outputs are ORed together on the power
supply distribution PWB (A7) and a common +12 V supply is applied to the control/monitor stage.
Power supply distribution PWB
See Figures SD-1 (A, B or C) and SD-3. The power supply distribution PWB (A7) interfaces between
fan power supply modules U7 and U8 and the cooling fans for RF power modules 1 through 16 and
reject loads A, B and C. The fan voltage (+48 V) is applied via power rectifiers CR1 and CR2 to the
transmitter's cooling fans. A nominal 47 V is applied as Fan V Sample A and B to the control/monitor
stage for metering and fan PS fault detection.
The power supply distribution PWB also interfaces between SBC/AUI power supplies U1 and U2
and the control/monitor stage. +12 V is applied via power rectifiers CR3 and CR4 to the control/
monitor stage. A nominal +12 V is applied as +12V Sample A and B to the control/monitor stage for
metering and supply fault detection.
Control/monitor stage
See electrical schematics SD-4 and SD-5 and Figure 1.1 on page 1-4. The control/monitor stage
monitors critical samples and status/alarm signals from the ac-dc power stage, RF drive stage and RF
power stage. For example, RF power monitoring and RF power stage status information is applied to
the control/monitor stage. Based on the value and status of each input, the control/monitor stage
produces the appropriate control signals for the RF power stage to ensure the proper operation and
protection of the transmitter. The control/monitor stage also provides the remote control/monitor
interface for the transmitter.
The control/monitor stage comprises a control/interface PWB (A1), a remote interface PWB (A2),
an LCD touch monitor (U5) and a single-board computer (U6).
U5 is a 17-inch, colour LCD screen that is mounted on the front of the transmitter. It provides an
advanced user interface (AUI) for the transmitter. The AUI can be controlled by touch screen and is
also available as a flash graphic on any web-interfaced PC or handheld device via the internal NV web
server. See “Using the AUI” on page 2-2 for detailed information on AUI functionality.
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