R.V.R. Elettronica 4CX7500, Technical Manual

Page: 41 / 82

Date: 25/07/03 R.V.R. Elettronica S.r.l. (BO) VJ10000-TE - R.F. Tube Amplifier
41
3.4 EQUIPMENT SETTING AT WORK
To set at work the amplifier VJ10000 it’s necessary to execute the following operations:
1) The equipment is set for a mains voltage of 380 Vac (other on request), three phases with
neutral. It’s very important connect the neutral on the terminal marked N (blue), while for
the versus of the phases it’s necessary to respect the sequence R, S, T so that the MAINS led
is on, and since the blower is three phases type in any case to be sure the right rotation
version of the blower. For the connection of the exciter and driver use the apposite auxiliary
terminals (
FIG. 8
); to be sure to connect them to the relative terminals to avoid tube and
amplifier irreparable damages. After the tube mounting as showed in the previous
paragraph, connect again the mains voltage. All the panels owe being closed, or the tube
amplifiers doesn't start (safety condiction).
2) Set the exciter at the minimum power and place the ST: BY/H.V. ON on the ST. BY
position.
3) Place the driver ON/OFF switch to OFF position. Switch on the equipment through the main
switch and wait for the heating time. The number on the display shows the relative heating
time. This time can be set between four values by internal jumpers on the protection card as
described in the protection logic specifications.
NOTE : Pay attention to don’t broke the Interlock micro switches that stop the equipment.
4) Check with the multimeter that filament current is about 160 A.
5) Now, using the panel multimeter, verify that the filament voltage is 7V ±0.37 V; if the
correct sequence is follow starting the Timer for pre-heating previous to chenge in anodic
voltage.
If it doesn't work, follow the instructions to pag. 42 to verify the absence of signals on the
measures
card.
Ended to count of the Timer, the button is put in ON and must depart the electromagnetic
switch HT1 and HT2 if the electromagnetic switch departing HT1 is not turn the led: there is
a short circuit on the H.T.
Check to have installed the valve correctly.
Once starts the electromagnetic switchs HT1 and HT2 and the valve has been installed
correctly must be present an anodic current of 350-400 MA (it depends on the valve)
without pilotage. The valve has been installed correctly and that the amplifier is ready.
6) Switch on the exciter and when is lock to the set frequency, increase the power until 20-25
W.
7) Now, by the motorized tuning commands INPUT TUNE and INPUT LOAD moove the
motors of tuning, verify to obtain the minimum SWR readable on the exciter PWR meter; at
the same time, verify to obtain a plate current increasing.
8) Adjust the OUPUT TUNE command to obtain the maximum value of the output power and
execute the same sequence to OUPUT LOAD command.