Document No: LT0255
F3200/NDU AS4428.1 Installation Manual
System Specifications
Issue 1.22
5 July 2016
Page 3-9
AZC SPECIFICATIONS (CONTINUED)
Min
Typ
Max
AZC current limit at 13.1V (note 1)
15.0mA
16.6mA
18.0mA
(14.0mA)
AZC current limit into short circuit
16.0mA
17.5mA
19.0mA
(15.0mA)
EOL & detector quiescent
11.95mA
EOL, no detectors
7.2mA
7.8mA
8.2mA
(7.0mA)
Fault threshold
4.4mA
5.75mA
6.8mA
Detector quiescent
0mA
4.0mA
Notes
1.
The minimum figures shown are for battery voltage greater than 22.5V. The figures
shown in brackets are for a battery voltage greater than the minimum Standby
(Battery Fail) level i.e. 21.5V. These figures allow temperature variation.
2.
Modes 1 & 2 have the same thresholds before the Alarm state is latched. For Mode
2 additional current is turned on once the Alarm state is latched (refer to Graph
3.4.2).
Mode 3 Only
Min
Typ
Max
Current into short circuit
34.3mA
Current into 800 Ohm (note 3)
14.2mA
14.8mA
15.3mA
Current into 2000 Ohm (note 4)
8.0mA
8.2mA
8.4mA
EOLR Current
2mA
Minimum current for EOLR & 2k circuit
1.64mA
Modes 3 & 4
Fault thresholds
0.85mA
1.28mA
1.59mA
Maximum allowable load or circuit leakage
0.5mA
Notes
3.
I.e. short at end of an 800 Ohm circuit (gives voltage band B2 alarm, ref. graph
3.4.1).
4.
I.e. short at end of a 2000 ohm circuit (gives voltage band B3 alarm, ref. graph 3.4.1).
MCP Zener Diode
For voltage band B3 operation
BZT03C15 3W, 15V.
Detector Alarm Currents
The current available to a latched detector is the AZC supply current at the detector "Alarm"
voltage minus the EOLR current and the remaining quiescent current at that voltage.
The following graphs show current/voltage characteristics for the various modes of
operation.
