User manual
15
TURNING ON
Hera does not have an on/off switch. It lights up when the AC
power is connected. At boot-up, the LCD screen will briey
display the unit’s rmware version. Contact an Apex-approved
dealer for any software updates which may become available.
STANDARD OPERATIONS
The LED indicator on the left side of the front panel displays
the sound pressure level in dBspl. This can be pre-selected to
show present, average or maximum value as follow.
RMS: present level
LEQf (fast): average value over 10 seconds
LEQn (normal): average value over 1 minute
LEQu (user): average value installer adjustable period
MAX: the peak value
The LED display mode is changed by pressing the ‘dB mode’
button. The selection is shown on the LCD dis¬play when in
‘clock’ mode.
In case the Leto deported display is used, it will mimic the LED
display.
COMMENT: if the sound pressure level falls below the
minimum measurable (55 dB) then the display will show
4 horizontal bars ‘- - - -‘.
The LCD screen in the middle of the front panel has three
different display modes:
• ‘clock’ mode
• ‘measure’ mode
• ‘error’ mode
These three modes are selected by pressing one of the three
switches labelled ‘clock’ ‘measure’ and ‘error.’ See below for
details about each mode.
Messages on this display can be in English, French, Dutch or
German. Language selection is made from the installer menu.
Principles of operation
The 4 LEDs located just above the push buttons have the
following functions:
• Red LED error: lights in the event of any fault.
This could, for example, come from the seal of the
Argos. If this happens, the message will be stored
in the list of errors (cf. ‘error’ mode). The LED will
go out a few seconds after the problem disappears.
• Green LED link: when the Hera is properly
connected to an Argos, this LED shows that the
connection is good. It should be lit up at all times
when the Argos is in use.
• Yellow LED warning: lights when the ‘alert’ relay
is triggered. This LED only functions when the Hera
is used in stand-alone mode.
• Red LED alarm: lights when the ‘cut’ relay is
triggered. This LED only functions when the Hera is
used in stand-alone mode.
LCD IN CLOCK MODE
This is the normal operation mode. In this case, the
displays will look something like this :
In the left upper corner you nd the actual time displayed
in the following format: HH:MM:SS. In the right upper
corner, the date will be displayed in the following format:
DD/MM. The second line indicates the LED display
MODE (RMS, LEQf, MAX, …), followed by the actual
threshold indicated in dBspl. Above this threshold level,
the Argos will begin to reduce the signal. In case the logic
outputs are enabled and if the equivalent continuous
sound level (LEQ) over adjustable period of time exceeds
the threshold, the logic outputs will be triggered. The
threshold can be adjusted from the installer menu.
In this mode the Data Encoder knob allows the LCD
back-lighting to be adjusted.