Acom 700S, Operating Manual, Page: 20 / 30

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At the second level (SOFT FAULT) the amplifier reverts to Stand-by mode for four seconds or permanently
depending on whether the “AUTO OPERATE” option had been activated. A respective message is
shown on the screen, for example “Excessive Reflected Power”, “Excessive Drain Current”, and others,
as well as with a sound alarm (unless the sound had not been muted – S. 5-4).
Unlike those for a WARNING, the SOFT FAULT messages remain on the screen and persist until the
operator pushes any button - in order to confirm that the message is read - or until the OPERATE mode
will be resumed automatically when the AUTO OPERATE is active – S. 5-4)
SOFT FAULT’s call for fast and simple correcting actions by the operator, such as, for example, reducing
the drive power, improving of load SWR through retuning the antenna tuner, antenna change, etc.
c) The third and most serious protection level is a HARD FAULT. The amplifier will be turned
off automatically to avoid possible further damages.
When the protection trips off, the data about the fault is stored in the memory and the front panel screen
is blanked. There is also a sound alarm - a series of CW letter F.
If the reason for tripping the protection is not obvious, you can try to turn on the amplifier. If the amplifier
allows it after the fault, a fault message will appear with information about the reason for the latest
automatic shutdown (for example, overheating of the power supply unit or of the PA stage).
After pushing any button, the fault message will disappear, and if there are no current problems (for
example, the overheated unit has already cooled down), the amplifier operation will be restored. In
the event a parameter maximum is exceeded again, a new message will appear on the screen, or the
protection will trip again immediately after the recovery attempt.
If the problem persists, contact your dealer – S. 1-2.
At each “HARD FAULT” shutdown the amplifier stores data, concerning the controls and values, the trip
time, and others. Your dealer or his service may ask you to read this data out from the amplifier screen
or by RS232 interface and store it in a computer file – see menu FAULTS LOG, Sections 5-5 and 7-4.
5. MENUS – SETTINGS AND OPTIONS
By pushing the MENU button (the rightmost) the user invokes the menu selection screen (Fig. 5). Each
menu can be selected by the ITEM (up and down) buttons and SELECT.
The items in each menu are selected and controlled by the same six buttons as in the basic screen,
but they have new functions.