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Azf description, Azf supervisory current, Overload protection – Honeywell NOTIFIER IFS-2600 User Manual

Page 16: Zone overload self reset

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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.