Alarms Management; Self-Diagnostics - Elkron HPA702L Installationshandbuch

1.1 ALARMS MANAGEMENT

After having correctly wired and closed both inputs (block function at power-on), the siren generates an alarm
only when both "TC" system status signal (signal present = deactivated system) and the "BL" alarm block
signal are missing.
The absence on only one of the two does not generate any alarm event; in order to block a current alarm, it is
enough to provide the block signal. If the block signal remains open for a long time, the timeout programmed
through suitable jumpers intervenes, and takes care of ceasing the sound. After having blocked the alarm, the
flash goes on blinking (approximately every 2.5 s). The siren remains in such alarm storing status till the TC
signal is provided (the system is turned off).
NOTE: In case of discharged battery (below the 11.5V threshold), the flash blinking is stopped to save
the remaining energy in favour of the acoustic alarm.
As completion of siren performance, two additional functions are available, through suitable jumpers:
Alarm Count and Scaffolds Function (For details about their operation, see paragraphs 3.5 and 3.6).
If the central unit has not a system status output, it is necessary to connect together the two BL and TC
signals, taking into account that in such a way part of provided performances are lost (alarm memory, alarm
count, scaffolds function).
NOTE: It is mandatory to connect the backup battery since, being the current absorption from central
unit limited, without it the siren is not able to sound.

1.2 SELF-DIAGNOSTICS

The HPA702L/N siren implement an innovative "active self-diagnosis" function that takes care of verifying the
integrity of battery, horn, flashlight and protection module (if present).
This test is performed once one minute after activation (or correct application of the BL and TC signals), and
then at every system activation (TC input opening) and lasts for 1 second; during this time interval, horn and
flash are stressed and a measure of battery voltage under load is performed, thereby providing possible
anomaly signals through the "failure" output.
The battery voltage in case of absence of power from the control panel is continuously monitored in order to
signal any faults in a timely manner. The battery is already loaded and no additional loads are added in this
condition.
In this way, the full siren functionality is always kept under control.
A similar test is also performed at every alarm start and end; differently from the previous one, this test is
instantaneous since the battery is already under load. The anomaly signalling is then updated only under
these three conditions.
Possible failures are also signalled through the local yellow LED (present on the flashlight module), that
however is visible only with a deactivated system (switching on is enabled only with TC present by displaying
only the first anomaly encountered in a chronological order).
NOTE: When a single command for BL and TC is used, the sound is delayed by 1 seconds.
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