Eltek Delta OP - Appendix: Technical Features; HDFA Detection Line and Fire Brigade Output; DELTA Net Communication System

5 Appendix
User’s Guide '(/7$23 35
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In today’s modern, software-based systems, if the microprocessor stops and the
internal ZDWFKGRJ electronics do not manage to start it again, the system will not
function satisfactorily.
In order to avoid this — and other communication faults on the network or
detector loops — the '(/7$ modules have built-in galvanically insulated
electronics for hardware detection of fire alarms. Thus the '(/7$ modules
conform to the (XURSHDQ6WDQGDUG(13DUW
'(/7$1HW
'(/7$1HW communication — between '(/7$23 and '(/7$'$ modules —
consists of two twin cables, where one of them is used as HDFA detection line and
the other twin cable as H%XV communication line.
The HDFA function will be able to report a fire alarm from the '(/7$'$
modules even if:
 The microprocessor in '(/7$23 stops
 The microprocessor in '(/7$'$ stops
('LVFRYHU\ detectors only)
 Communication on the '(/7$'$ detector loops does not work
('LVFRYHU\ detectors only)
 There is a break or short circuit in network communications
(all types of detectors)
In such situations the HDFA function in the relevant '(/7$'$ module will be
activated. Any fire alarm signals will be detected by the '$ module’s HDFA
function, which will send the message on to the main '(/7$23 panel via the
HDFA detection line.
HDFA DODUPV will be shown as a fire alarm indication
8
and will activate the fire
brigade remote output in the main '(/7$23 panel.
8
A HDFA alarm is indicated by LED and buzzer, it is not displayed on the graphic display.
Example: '(/7$1HW with HDFA Detection Line
Technical Room
Discovery Discovery
H%XV Line
24VDC
Reception Area
0DLQ

SDQH
O
'(/7$

2
3
'(/7$

'$
220 VAC
'(/7$

'$
Discovery Discovery
HDFA Detection Line
'(/7$

'$
Discovery Discovery
Laboratory Building
220 VAC
H%XV
Line
Tele
+')$:
+ardware 'etection
of )ire $larm