Honeywell NOTIFIER IFS-2600 - Manual (Page 16)

Page 12 IFS-2600 Installation & Programming Manual
P/N 10069 ECN08-0066
AZF DESCRIPTION
The AZF's on the IFS-2600 are monitored and scanned by custom thick film hybrids. These hybrid IC's
significantly reduce the possibility of false alarms and improve product efficiency and reliability.
The total Alarm Zone loop resistance is the sum of the end of line resistor (EOLR 4K7) plus all the parallel
connected detector loads.
AZF SUPERVISORY CURRENT
The supervisory current flows through the external terminal AZF+, through the field cable and to the end of line
resistor (EOLR), returning to the panel at AZF- terminal. Parallel connected, across the 2-wire pair field cable,
are a number of the previously listed detectors. During the quiescent state there is essentially an open circuit
across the + and - terminals of the detector base. The maximum number of detectors that can be installed on
each AZF is dependant on the type of detector and is listed in the IFS-2600
ActivFire ® listing.
In an alarm state, a 560-ohm resistor is connected across the detector base causing additional loop current to
flow. This is sensed by the AZF to produce an alarm output. Removal of the E.O.L. resistor (in a non alarm
state) or the interruption of the supervisory current will produce a fault signal in the AZF.
As described above, the level of current is used to define the status of the alarm zone: -
I = 3.5 mA and below FAULT
I = 4.0 - 5.0mA at 24V QUIESCENT
I = 16 mA to 40 mA (current limited) ALARM
The zone current is used by the hybrid IC to determine the condition of the zone as above. This information is
then transferred to the microprocessor for processing.
OVERLOAD PROTECTION
Panel Supply Fuse F1 M205 5A
Battery Charger Fuse F2 M205 3A
Battery Protection Fuse F3 Polyfuse 3A
External Supply Fuse F4 M205 7A
Door Holder Fuse F5 M205 3A
Aux Power Output Fuse F6 M205 1A Slow Blow
Bell Fuse F7 M205 1A
Warning System Fuse F8 M205 1A
ACF Fuse F9 M205 1A
AZF Circuits Current Limited 40mA
ZONE OVERLOAD SELF RESET
If a zone is overloaded by an accidental short to earth on an AZF circuit, the zone will automatically shut down
and produce a fault. Once this happens the panel will automatically recheck the zone every 60 seconds and
once the overload is removed, restore power and the fault will clear.