Advantech AWMT, Installation And Operation Manual

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AWMT
17
4.3.8 M
AIN
C
ONTROLLER
B
OARD
The
Main Controller Board contains a microprocessor controller that performs all of the
monitoring and control, input/output communication and the decision-making. The main
controller board provides:
1. Fault detection and indication from each module of the unit,
2. Mute control and indication (Tx and Rx),
3. Forward RF power indication,
4. Reflected RF power indication,
5. Redundancy control (Tx and Rx),
6. Frequency control (Tx and Rx),
7. Unit Gain control (Tx and Rx), and
8. All interfaces.
4.3.8.1 FAULT Detection and Indication
The Tx path of the unit will automatically go into a shutdown mode and send a message to all of
the external interfaces when any one of the following occurs:
1. The local oscillator within the up-converter module is out of lock.
2. The hotspot temperature exceeds 85
°
C.
3. Any of the GaAs FET devices failed.
4. Current of +12 VDC supply is out of range.
5. Load VSWR at RF output port (transmit path) exceeds 3.0:1.
The Tx path of the AWMT continually monitors the internal temperature and the current
consumption. It also has an automatic shutdown feature to prevent operation at excessive
temperatures. The unit will automatically restart when the hotspot temperature falls below 65°C.
The Rx path of the unit will automatically go into a shutdown mode and send a message to all of
the external interfaces if:
1. The local oscillator within the L/IF down-converter module is out of lock.
2. The LNX and L/IF down-converter current is out of range
.
4.3.8.2 Tx MUTE Control
The user can remove the RF output power for the Tx path remotely by: