Apex Digital Hera, Руководство пользователя, Страница: 26 / 32

26
Function 6.4: Manual compensation setting
This option is used to manually enter the compensation. The
actual compensation in decibel is shown on the LED display.
Turn the rotary encoder to adjust it. Press ‘enter’ to confirm
and ‘undo’ to cancel.
Adjustment range goes from -20 to +20 dB per tenth of dB step.
OPERATION SET-UP
Function 7: Adjust threshold
Function 7.1: Selecting threshold mode
The limit threshold can be either constant or can vary following
a weekly list. You can choose between ‘Always xxx dB’ or
‘follow list’. Select by turning the encoder and then pressing
‘enter’.
Function 7.2: Threshold by default
This option enables you to set the threshold when you have
chosen the option ‘Always xxx dB’. Select by turning the
encoder to the desired value and then press ‘enter’.
Adjustment range is from 70 to 110 dB.
Function 7.3: Editing the weekly list
The weekly list allows the 7-day week to be sliced into 4
daily time periods, making a total of 28. The threshold can
be different for each of these periods. The beginning of one
period marks the end of another.
Press ‘enter’ and the Hera will display the following message:
This shows the first period, which begins Monday at 3 a.m. and
ends at 8 a.m. Using the rotary encoder you can adjust the
threshold for this period. This will be shown on the LED display
at the left of the Hera front panel.
Only the time shown on the first line can be changed on this
screen. It can be changed using the ‘next’ and ‘exit’ buttons,
‘exit’ to increase the time in hourly intervals and ‘next’ to
decrease it by the same amount. The end time, shown on the
second line, indicates the start time of the next period. The one
period’s end time cannot overlap the next period’s start time.
To go to the next time period, press ‘enter’, change the start
time using the ‘next’ and ‘exit’ buttons and change the threshold
using the rotary encoder.
To go back to the preceding period press ‘undo’.
When the start times for all periods have been set, Hera
requires a few moments to store the new list.
Function 8: Logic outputs
Relay outputs are triggered on time-averaged sound level
value. Time-averaged sound level is also called equivalent
continuous sound level (Leq) . It is nothing more than an
averaging of each RMS sample values measured over a
certain period of time (each sample being taken every 125 mS).
This Leq value is then compared with the actual threshold and
relays are switched on or off as explained bellow.
Function 8.1: Logic outputs mode
With this function you can choose from the following mode:
• Disabled: the outputs will never be activated
• Traffic-light: see the ‘Traffic-light mode’ section earlier in this
manual
• Warning & cut-off: see the ‘Warning & cut-off’ section earlier in
this manual
Function 8.2: Reconnecting the AC mains supply
This option resets both relays and thus re-establishes the AC
electric supply and switches off the warning lamp.
This is the only way to reconnect the AC supply if function 8.5
has been set to ‘Manual’.
Function 8.3: Warning time-averaged period
This function allows you to set up the time-averaged period
before the ‘alert relay’ signalisation is set. As soon as the
actual threshold is exceeded once, this period starts counting
and the average sound level is computed. If this average is
then higher than the threshold, the ‘alert relay’ will be switched
on and the ‘cut’ time-averaging begins. If the average is below
the threshold, nothing happens.
Adjustment range is from 10 sec to 60 sec by 10 sec steps.
Function 8.4: Cut-off time-averaged period
Enables adjustment of the averaging period before the ‘alarm/
cut relay’ operates. If the average sound level over this period
is higher than the threshold, the ‘cut relay’ is activated and the
AC supply is cut off. If it is lower than the threshold, both ‘alert’
and ‘cut’ relays are deactivated.
Adjustment range is from 1 min to 20 min by 1 min steps.
Function 8.5: Recover after period
This option is used to configure the averaging period before the
AC supply can be recovered. If the equivalent sound level over
this period is below the threshold, both ‘warning’ and ‘alarm/
cut’ relay will be reset. If not, this period starts running again.
By choosing the ‘Manual’ option you can opt for manual reset.
In this case the PIN number must be known to enable access
to the installer menu. Function 8.2 should then be used to bring
the AC supply back on line.
Adjustment range is from 1 min to 60 min or manual recover.