WXR SYSTEM - ANTENNA FUNCTIONAL DESCRIPTION
The CPU in the WXR R/T controls and monitors the antenna operation.
The WXR R/T uses attitude inputs from the ADIRU for antenna stabilization. The CPU uses the attitude inputs to calculate and control the scan and elevation movements. It sends the scan and elevation drive signals to the antenna.
The antenna power supply gets 115v ac from the WXR R/T. The antenna power supply sends 26v dc power to the antenna motor driver. The motor driver sends 26v dc power to the scan and elevation stepper motors. The motor driver also sends power to the antenna position monitors.
The antenna has one scan motor and one elevation motor.The scan motor drives a geartrain which moves the antenna horizontally. It moves the antenna 90 degrees from the centerline of the airplane. The elevation motor drives a gear train which moves the antenna vertically. It moves the antenna up and down |40 degrees. This elevation range includes 15 degrees for the manual tilt.
Antenna Position Feedback
There are two zero and two incremental monitors in the antenna assembly. Each stepper motor has one zero monitor and one incremental monitor. The zero monitors read the zero or center position of the stepper motor. The incremental monitors count the number of steps the motor moves from the center position. The monitors send antenna position data to the WXR R/T.
Antenna Position Compare
The WXR R/T CPU uses the position information from the
monitors to compare the actual antenna position with the
desired antenna position. When the two are not the same, the WXR R/T sets the antenna fault.
The disable switches are on the antenna pedestal. The scan disable switch disconnects the scan motor from the motor drive. The elevation disable switch disconnects the elevation motor from the motor drive. Because the motors disconnect from the motor drives, the antenna does not move.
CAUTION: AN OPEN DISABLE SWITCH DOES NOT STOP RF TRANSMISSION FROM THE ANTENNA.
WXR SYSTEM - WXR R/T BITE - FUNCTIONAL DESCRIPTION
The CPU in the WXR R/T controls the operation of the BITE module. These are the functions of the BITE module:
· Gets status information from the interface components
· Gets internally monitored data
· Does a self-test when it gets a command from the WXR CP
· Sends a test pattern to the DEUs to show on the ND
· Sends system status data to the DEUs to show on the ND.
Date: 2016-01-14; view: 371