Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Page
3-1
Section 3 Operating Instructions
Issue 1.1
Vector-LP Radio Beacon Transmitter
TECHNICAL INSTRUCTION MANUAL
Section 3
OPERATING INSTRUCTIONS
3.1 INTRODUCTION
The following instructions are intended
primarily for persons involved in testing or
maintenance of the equipment.
3.1.1 Precautions
The Vector-LP transmitter contains many
solid state devices that can be damaged if
they are subjected to excessive heat or high
voltage transients. Ensure the circuits are not
overdriven and are not disconnected from
their loads while turned on.
3.2 EMERGENCY SHUTDOWN
If an emergency shutdown is necessary, no
special precautions are required. However,
the type of shutdown is dictated by the
reason for the shutdown. There are two
types of shutdown. The first turns off the RF
output by inhibiting the power stage. The
second turns off the RF output and disables
all of the internal power supplies by
disconnecting the ac and dc power sources.
3.2.1 Turn Off RF Output
When the cause of the emergency shutdown
is external to the transmitter or is in the RF
output portion of the transmitter, the following
will turn off the power produced by the RF
power module:
WARNING
The following will not remove the ac or dc
power source voltage from the
transmitter or inhibit any of the internal
low voltage dc supplies or the B+ power
supply. If the reason for the shutdown
requires all voltages be turned off,
proceed directly to paragraph 3.2.2
x
If in local or remote control, press the
RF
Off
switch on the transmitter’s front panel.
x
If in remote control, select
RF Off
at the
remote control site.
x
Open any external interlock switch.
3.2.2 Complete Shutdown
When the cause of the emergency shutdown
dictates the need for a complete shutdown of
the transmitter, do the following:
x
Switch the ac power switch on the back of
the transmitter to
OFF
.
x
If applicable, disconnect the dc power
source (battery).
3.3 EXTERNAL SAFETY INTERLOCK
The external electrical interlock circuit is a
protection circuit controlled by user
determined, serially connected, normally
open/held closed interlock switches. It inhibits
the RF output when it is not safe to produce
RF output.
When all of the external interlock switches are
closed and it is safe to produce an RF output,
the front panel's system diagram
External
Alarm
lamp will be off. The operator will have
full control of transmitter functions.
When any external interlock switch is open,
the RF output stage will automatically turn off.
The front panel's system diagram
External
Alarm
lamp will turn on (alarm state). It is not
possible to enable the RF power stages until
all of the external interlock switches are
closed.
