User’s Manual 7
The front part of the board is made by a polycarbonate panel, oil- and solvent-resistant with the
identifying symbols and inscriptions. There are two slightly different front panels. The
DST4600A front panel is the standard one. The DST4600A/P front panel is used mainly for
switchboard for parallel application; the boards with the DST4600A/P panel have different part
number.
“/P” version assigns a special meaning to the followings signals:
“ALARM 1” signal means “EXTERNAL SHUTDOWN”
“ALARM 2” signal means “AUX ALARM”
“MAINS VOLTAGE” signal means “MAINS VOLT./SIM. STATUS »
Substantially, the panel is divided into the three operational areas as described below.
This area can be functionally further divided in two different areas.
It corresponds to the right bottom part of the front panel. It groups all the available control units.
It includes:
A button (“START”) for the manual starting of the generator set engine. The manual start
can be executed only with the key selector on MAN. This button, alone or combined with
the others, can also take other meanings during some particular procedures not directly
related with the management of the generator set (programming, calibration, etc.).
A button (“STOP”) for the manual shutdown of the generator set engine. The manual
shutdown can be executed only with the key selector on MAN. By pressing this button
with the key selector in other working positions (AUTO or TEST) the engine shutdown
will be executed through the emergency procedure (see the faults management). This
button, alone or combined with the others, can also take other meanings during some
particular procedures not directly related with the management of the generator set
(programming, calibration, etc.).
A button (bearing the symbol of a siren, from now on called “MODE / ACK”) for the faults’
acknowledgement and the consequent muting of the audible alarm and to reset the
alarms, too. This button, alone or combined with other buttons, can also have other
meanings.
Two buttons (bearing the symbols of two arrows, from now on called “F1” and “F2”) used
to select what to show on the display “MULTIFUNCTION” (see par.2.1.2). These
buttons, alone or combined with other buttons, can also have other meanings.
A key selector allowing to select the board’s controlling mode of the generator set’s
operation: OFF/RESET - PROGRAMMING - MANUAL - AUTOMATIC
– TEST. The key
can be extracted only in the positions OFF/RESET and AUTOMATIC. Here follows a
short description of the operating modes:
a) OFF/RESET: in this mode the board is on, but all the functions for the control and
the running of the generator set are disabled. It is used in all the cases in which
the intervention of the generator set is not required (i.e. in order to prevent
unnecessary automatic interventions during the closing periods of a factory etc.)
and above all as a safety position during the maintenance. Actually, when the
selector is on OFF/RESET, the control device is completely disabled and
therefore the generator set cannot intervene in the event of mains voltage failure.
The mains contactor is forced at work therefore the users are powered by the
mains (if it’s present). The monitoring of the mains status, of the engine and of
the generator are anyway enabled and the indicators belonging to the “functional
