R.V.R. Elettronica VJ2000, Руководство пользователя

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VJ2000
7 / 44 USER MANUAL Rev. 4.0 - 26/02/01
load tuning: the two led indicators signal respectively the stop for the plate tuning at 87.5
MHz (9 Fig.1) and at 108 MHz (10 Fig.1), while the three selectorsare used rispectively for to
enable the engines of tuning (8 Fig.1), for the plate tuning (11 Fig.1) and for the load tuning
(12 Fig.1).
Then there are three led indicators that signal alarms: for an excess of S.W.R. (13 Fig.1), for
insufficient fan pressure (15 Fig.1) and for an excess of grid current (14 Fig.1).
The following are present on the front panel: an HT indicator (16 Fig.1) which signals that the
high voltage supply is active; a switch to activate the HT supply, or put the unit in stand-by (19
Fig.1); an on-off switch (18 Fig.1) and corresponding indicator (17 Fig.1); an hours counter
(20 Fig.1) to show the total number of hours that the unit has been operational.
4.4 Pritection System
The VJ2000 features protection against: excess VSWR, excess grid current, opening
of panels with the unit active, and insufficient ventilation.
Under abnormal conditions the unit will be automatically disactivated; after 90 seconds the
protection system will re-activate the unit if the condition has returned to normal, unless a
panel is still open or the cooling system lacks sufficient pressure.
In this event, the procedure is repeated four times, after which the unit will remain disactivated
for 15 minutes.
If, after 15 minutes, the condition is still present, four more switch-on attempts are made,
after which the unit is shut down indefinately.
Should, during these cycles, the fault condition dissappear and the protection system succeed
in re-activating the unit for more than 15 minutes, the fault condition counter will be reset to
zero.
N.B. The times indicated above are approximate and may vary considerably.
4.5 Specifications
Please refer to Table A for the electrical specification and Table B for dimensional and
environmental specifications.