Elenos T30000, Руководство пользователя

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Hand Book T30000 -
10
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USER INTERFACE AND LOGIC OF OPERATION
The display of all controls and operational parameters are situated on the unit's front panel. Any
suspension of operation, whether temporary or indefinite, results in the thermionic tube's HT anode
supply being shut down and the disabling of the modulator's supply. The shutting down of the
equipment as a result of a fault condition will be refer hereafter as the protection state. The most
frequent causes of each anomaly indicated are also displayed, assuming the unit is not faulty.
Four of the five meters simultaneously display the following operational parameters:
1) the RF power output (P.W.R.) 25KW f.s.d.
2) the reflected RF power present at the radiating system connector (S.W.R.), 2.5KW f.s.d.
3) the thermionic tube's anode current (I.A.) 5A f.s.d.
4) the thermionic tube's grid control current (I.G.) 2A f.s.d.
The fifth meter (TEST) can be switched to five different functions via a rotary selector switch situated
above it:
1) (V.C.) calibration of all meters. With the selector in this position, all the meters will display full
scale deflection (f.s.d.) to allow the operator to calibrate the scales and identify a faulty meter.
Adjustment of the meters is via 5 pre-set potentiometers located on the card E20131.x behind the
front panel (see circuit diagrams).
2) (V.HT) selects the reading of the anode supply voltage, 10KV f.s.d. DC.
3) (V.BIAS) selects the reading of the cathode/grid bias voltage of the thermionic tube, 200Vdc f.s.d.
4) (C.AIR) selects the reading of the temperature of the amplifying cavity's hot air exit, 100
°
C f.s.d.
5) (V.F.) selects the reading of filament voltage, 10V f.s.d. AC
The lever switch located above the rotary selector, described above, allows operation to be suspended by
the operator (ST.BY) or restored (H.T.). In the ST.BY position, the thermionic tube's anode voltage is
removed and the modulators supply is cut as in a "protection state".
The ST.BY indicator light identifies the position of the switch described above.
The RESET switch allows the operator to disable the automatic shutdown of the transmitter which follows
when the maximum number of automatic resets has been reached (8) for various parameters being
monitored: reflected power, anode current, grid control current and amplifier cavity cooling air exit
temperature. The number of resets that have taken place is displayed on the front panel alphanumeric
display (PROTECTION COUNTER). When the electronic logic has reached the limit of automatic
resets permitted, the unit will shutdown indefinitely and the front panel LOCK indicator will light. The
attempts at automatic reset are cumulative and will increment the counter even if they result from
different causes.