Data redazione: 05/08/04
R.V.R. Elettronica S.r.l. (BO)
VJ32000-TE - R.F. Tube Amplifier
39
In case of DELTA configuration isn’t necessary the neutral connection while for STAR
configuration the neutral connection is necessary too.
The three phases connection cables must have minimum section of 25 mmq for a voltage of
380/415 V and must have minimum section of 35 mmq for a voltage of 208/240 V.
The ground connection must be executed by a cable with a section of 35mm2.
The main switch (monophase) present on the front panel switch off only the power supply of
the services with small energy absorption but not the completely high power line.
WHEN THE EQUIPMENT IS CONNECTED TO THE MAINS VOLTAGE IT’S
NECESSARY TO BE VERY CAREFULLY BECAUSE THE INTERNAL PARTS OF
EQUIPMENT CAN CAUSE THE DEATH OF THE OPERATOR FOR FULGURATION.
After the connections to the mains voltage it’s necessary to realize a small checking.
Looking at the equipment in the rear part of the power supply rack (at the height of the knee)
it’s possible to see a three phases controller with led indicator ON.
If this led is OFF there is the possibility to have one of the following two anomalies: the first
is that is absence the mains voltage, the second is that one phase version isn’t correct.
For this last case is sufficient to change the position of two phases wires.
With the mains voltage present, you must switch on the main switch on the front panel for
few seconds and then switch off again the main; during these few seconds check the rotation
verse of the blower.
If the rotation isn’t correct, it’s necessary to inverte the position of two of the power supply
wires placed on the main metre of the blower.
When you have ended these operations, the connection to the mains voltage is completed.
3.5 TUBE INSTALLATION
Only when the equipment is correctly connected to mains voltage it’s possible to install the
tube inside of the RF cavity of the amplifier.
The power supply is necessary to allow to the tuning meter to move some mechanical parts,
but it’s necessary to switch off the main blower before
to start the operation on the RF cavity.
On the front panel of the right rack, open the panel that allows the inspection of the
electronic cards, the fuses and the protection switch of the blower.
Place on OFF position the protection switch of the main blower (on the top position in the
right side). Open the cover panel of the R.F. cavity placed on the top of the left rack
(fig.9A). It isn’t necessary to open other panels of the cavity. Switch on the power supply
by the main switch placed on the front panel of the right rack. Move one of the four tuning
commands (on the top in the right side) so that the grounded bridge (plate tuning) inside of
the RF cavity reaches the highest position possible.
Realise the plate tuning pipe clamp placed on the top of the RF cavity. With hands push up
the plate tuning pipe until it’s inserted in the grounded bridge. The pipe must be pushed up
until remains free a sufficient space to insert the tetrode inside the socket (fig.9B).
When the pipe is on the top position, clamp the clip of the pipe so that is fixed in this
position. Take the tube from one of the other packing paying more attention to: don’t touch
with free hands the ceramic parts of the tube, and don’t cause damages with big crashes.
Now, insert the tube inside the relative socket, and check if the position is correct inside the
fingers of the socket. When the position is correct, realise the clip of the pipe until the
position of the antenna coupling capacitors are parallel both in vertical and radial position.
