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WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.7 Control System Description
The control system is a micro-controller based master/slave system. It monitors
over 100 operating functions in the transmitter and can make intelligent operating
decisions based on operating conditions. It has the standard parallel remote
connections. The microprocessor control system allows fast and efficient
monitoring of the entire transmitter offering a level of protection and diagnostics not
available with a simple logic controller. It also makes changes and upgrades a
simple matter of changing the firmware.
The Controller consists of the following boards:
• Master Controller Board
• PA Controller #1
• PA Controller #2
• Power Supply Controller #1
• Power Supply Controller #2 (Optional)
• Life Support Board
• Display/Backplane Board (motherboard)
All of these boards are located directly behind the transmitter control panel and plug
into the Display/Backplane Board. The entire assembly is considered the “System
Controller”.
The Controller functions include:
• Transmitter Control Functions
• Automatic Power Control, or APC
• VSWR Monitoring and Overload Protection
• Power Supply Monitoring and Protection
• Power Amplifier Monitoring and Protection
• Automatic power foldback for VSWR, Over-temperature and Over-current con-
ditions.
• AC Restart
• System Calibration and Configuration
• Detailed Status, Metering, Configuration and Fault Diagnostics display screens.
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