Nautel XL12, Technical Instructions

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12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 3-5
01 January 2002
Table 3-1 Control/Monitor Panel Controls and Indicators (Continued)
PANEL MARKING/
REF FIG NOMENCLATURE FUNCTION
DES NO. USED IN TEXT
A1A3DS6 MD-3
♦
RF POWER - SHUTBACK
Bi-colour display which indicates the on/off status of the
pulse duration modulation (PDM) pulse trains.
Display is green when PDM pulse trains are being
generated (RF power should be being produced).
Display is red when the PDM pulse trains are being
inhibited because the protection circuits have detected a
condition that would cause the RF power stage's RF stress
current thresholds to be exceeded (RF output is turned off
[shutback]).
A1A3DS7 MD-3
♦
RF POWER - CUTBACK
Bi-colour display which indicates the power level status of
the RF output.
Display is green when the pulse duration modulation
(PDM) on/off ratio is normal (RF output should be the
preset level for the selected RF power level).
Display is red when RF output has been automatically
reduced (cutback) because three or more RF shutbacks
(normally caused by high reflected power or high RF
current) have occurred within a three second period.
A1A3DS8 MD-3
♦
EXCITER - STANDBY
Bi-colour display which indicates the operating status of
the standby exciter.
Display is green when selected main exciter is providing the
RF drive and PDM information and the standby exciter is in
reserve.
Display is red when the standby exciter has been enabled
and is providing the RF drive and PDM information.
Indicates the selected main exciter has malfunctioned and
there is no reserve exciter.
A1A3DS9 MD-3
♦
LOW VOLTAGE POWER
SUPPLY - BATTERY
Bi-colour display which indicates the charge voltage status
of the batteries installed on system control PWB.
Display is green when the battery voltage is satisfactory
(more than 4.0VDC).
Display is red when the battery voltage is not satisfactory
(less than 4.0VDC). Indicates batteries are becoming
discharged and they should be replaced.