SECTION III
OPERATION, CONTROLS, AND INDICATORS
3.1 Control Cabinet
3.1.1 Cabinet Circuit Breaker
CB-1 is located behind the control panel on the left. To open the
panel, press on its right-hand edge.
3.1.2
Front Panel Pushbutton Switches
TRANSMITTER ON: Pressing the transmitter ON button turns
on the transmitter. The exciter is unmuted and all main controller
functions are enabled. Cabinet ON signals are sent to the slave
controllers in the amplifier cabinets, which will in turn activate
the cabinets. The ON button is illuminated green to indicate ON
command given.
TRANSMITTER OFF: Depressing the red transmitter OFF but-
ton starts the shut down sequence. The exciter is muted and
cabinet OFF signals are sent to the SLAVE controllers in the
amplifier cabinets.
LOCAL: Activation of the LOCAL switch disables the remote
control system’s commands. Status and analog information will
continue to be made available. The yellow lamp will be illumi-
nated if LOCAL mode is activated. Pressing the switch a second
time will re-enable remote control and extinguish the indicator.
POWER RAISE/LOWER SWITCHES: Pressing the raise or lower
buttons will affect the visual or aural power output of the trans-
mitter by adjusting the exciter power output.
3.1.3
Fault Status Indicators
During normal operation, none of the fault and interlock lamps
should be on. In the event of malfunction or interruption of an
interlock the lamp will turn on.
EXCITER FAULT: Indicates an exciter fault or exciter switcher
fault.
VSWRFAULT:IfVSWR foldbackisenabledtheVSWRFAULT
logic in the Main Controller is disabled and the VSWR fault
detection in the RF modules will protect them from damage. If
a VSWR condition causes VSWR foldback
to activate, the FOLDBACK ACTIVE fault
indicator will light and the power output of
the transmitter will be reduced. If the
VSWR condition exceeds the VSWR over-
load setpoint, the VSWR FAULT light will
flash on for 3 seconds indicating the over-
load setpoint has been passed even if the
foldback has reduced the transmitter out-
put.
SUPPLY FAULT: Indicates one or more of
the 50 volt power supplies has failed.
CONTROL FAULT: Indicates one of the
slavecontrollershasfailedand notrespond-
ing to busrequest from the monitor fordata.
AIR LOSS: Indicates one or more of the
amplifier cabinets has lost air supply.
VISUAL DRIVE CHAIN FAULT (op-
tional): Indicates a visual driver has failed
in the parallel driver chain.
DOOR INTERLOCK: Indicates one or
more of the amplifier cabinet doors is open.
If the amplifier cabinet was previously on,
it will return to normal operation approxi-
mately two seconds after the door is closed.
FAILSAFE INTERLOCK: If opened, the
failsafe interlock will mute the exciter’s
visual and aural RF outputs. Therefore, a
MUTE indication should appear on the ex-
citer LED display in addition to the FAIL-
SAFE INTERLOCK light. Normal
operation will resume when the failsafe in-
terlock circuit is closed. This interlock is
Figure 3-1. Main Control Panel
Rev. B: 1/11/1999 888-2365-001 3-1
WARNING: Disconnect primary power prior to servicing.
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