Nautel XL12, Технические инструкции

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12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 3-14
01 January 2002
Table 3-1 Control/Monitor Panel Controls and Indicators (Continued)
PANEL MARKING/
REF FIG NOMENCLATURE FUNCTION
DES NO. USED IN TEXT
A1A3S15 MD-3
♦
STATUS CONTROL -
ALARM RECALL
Push button switch that activates the alarm recall feature
when held depressed (integral lamp will turn on while held
depressed). Enables alarms that are no longer active but
which were latched into memory as the result of the
problem that forced the protection circuits to take the last
corrective/protective action. The
bi-color display
associated with the latched alarm will turn red.
A1A3S16 MD-3
♦
STATUS CONTROL -
METER ON/OFF
Push button switch that controls and indicates the on/off
status of the control/monitor panel's meters. When the
integral lamp is turned on, the meter selection circuits are
enabled.
A1A3S17 MD-3
♦ CONTROL - RF POWER - 4
Push button switch that controls and indicates the status
of preset RF power level #4. When its integral lamp is
turned on (by pressing and releasing the switch), it
indicates
RF POWER 4
has been selected. The forward
power level should be the preset level for this selection.
A1A3S18 MD-3
♦
CONTROL - RF POWER - 5
Push button switch that controls and indicates the status
of preset RF power level #5. When its integral lamp is
turned on (by pressing and releasing the switch), it
indicates
RF POWER 5
has been selected. The forward
power level should be the preset level for this selection.
A1A3S19 MD-3
♠
Exciter Control
Three position slide switch that controls whether exciter 'B'
can be enabled as the main exciter or as the standby exciter.
It is normally set to
SINGLE
in single exciter transmitters
that do not have the exciter 'B' assemblies installed.
When switch is set to
SINGLE
, the
CONTROL - EXCITER B
switch will have no influence.
It is normally set to
DUAL
in dual exciter transmitters that
utilize a normal main-standby exciter configuration.
It is normally set to
AUTO XFR INHIBIT
in dual exciter
transmitters when the automatic exciter transfer mode is to
be inhibited for maintenance purposes.
A1A4E1 MD-3
♠ RF PWR ON
Bi-position selector circuit that allows the user to configure
the
RF PWR ON
input to accept either an open ended or a
differential remote control input.
A differential input is selected when shorting shunt post E1
shorts pins 1 and 2 of 3-pin header XE1.
A single ended input is selected when shorting shunt post
E1 shorts pins 2 and 3 of 3-pin header XE1.