Elenos T30000, Руководство пользователя

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Hand Book T30000 -
12
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transformer sensor detects that normal temperatures have been restored. The most probable causes of
this anomaly are excessive ambient temperatures, or inefficient air filters.
The flashing UNDER PRESSURE light indicates that the pressure of cooling air within the amplifying
cavity is insufficient. The amplifier is in the protection state. The protection logic attempts a reset
when the pressure sensor detects that normal pressures have been restored. In this protection state, the
power amplifier will disable the filament supply as indicated by the ERRATIC VF light. The principle
cause of this fault is the inefficient condition of the cooling air filters or an insufficient circulation of
air in the room where the equipment is located. When the cooling fan is damaged or not incorrectly
powered, this protection state can arise sporadically.
The flashing ERRATIC VF light indicates that the filament voltage at the thermionic tube's socket is
incorrect. The amplifier is in the protection state. The protection logic resets operation when the value
returns to within a 5% tolerance. In the first phase of switching on, it is normal for this indication to
remain lit for up to ten seconds; this is due to the time taken for the filament power supply to reach its
operating value. This indication remains active if the UNDER PRESSURE indicator is lit at the same
time. When the filament voltage is at normal levels, the timer is activated to ensure a period of 300-
400 seconds elapses before the anode supply and the RF EXCITER supply are restored. In the event of
a loss of power lasting more than 1.5 seconds, the protection logic puts the transmitter into the
ERRATIC VF protection state and repeats the preheating cycle (TIMER ACTIVITY) before restoring
normal operation. The principle causes of anomalies can be related to problems of air pressure within
the amplifying cavity (see relevant paragraph) or caused by brief losses of power from the line supply.
The flashing ERRATIC T.P. LINE light indicates that the protection mechanism connected to the anode
power supply has intervened. The amplifier is in the protection state. The protection logic will not
automatically reset the unit; operator intervention is necessary. The principal causes of this anomaly
are short circuits, temporary or permanent, to any part of the anode supply circuit or chassis. In many
cases, it is a sign that the thermionic tube is at the end of its life or defective. Another cause of this
fault is high line voltage or an unbalanced three phase supply.
The flashing FAN PROTECTION light indicates that the protection mechanism connected to the main
amplifying cavity cooling fan has intervened. The amplifier is in the protection state. The protection
logic will not automatically reset the unit; operator intervention is necessary. The principal cause of
this fault is high line voltage or an unbalanced three phase supply.
The flashing ERRATIC BIAS light indicates that the cathode/grid bias voltage is incorrect. The amplifier
is in the protection state. The protection logic will not automatically reset the unit; operator
intervention is necessary: the only way to clear this fault and its effect is to remove electrical power
from the unit for at least ten seconds. The principal causes of this anomaly are short circuits,
temporary or permanent, to any part of the anode or cathode supply circuit or chassis. In many cases, it
is a sign that the thermionic tube is at the end of its life or defective.
The TIMER ACTIVITY light indicates that the timer is counting down during the pre-heating phase
required by the filament before the anode supply is enabled and RF excitation is applied to the input.