Technical Manual
FT420
– Iss 2.4
55
The CIE carries out an automatic battery load test every 72 hours for 60 minutes. During the
automatic battery test, the AC/DC power supply is disconnected and the CIE runs on batteries only.
Should any power supply related faults or an alarm conditions be detected, the automatic battery test
will terminate immediately and the CIE power supply fault indications would be signalled.
3.12.4 Power Supply Calculations
The following calculations should be carried according to the application requirements of the related
current standards, such as AS7240.2, AS1670.1, and AS1670.4.
1. Battery capacity calculation
2. AC/DC power supply current capacity calculation
WARNING:
The current consumption data used in this Chapter does not include any current supplied
to the external devices. The actual current consumption shall be re-calculated based on actual
system configurations. The following current consumption must be included in the power supply
calculations where appropriate.
•
ACF output
•
External Strobe output,
•
OWS Audio Amplifier if used,
•
Warning output to electronic sounders if OWS is not used,
•
OWS Dual Strobe output,
•
MDH power if supplied from CIE,
•
Backup power outputs,
•
Routing equipment current requirements (ASE),
•
Any other backup power supply outputs.
3.12.5 System Current Consumption
The current in alarm state is measured when two zones are in alarm condition, all the outputs are
activated and the Fire brigade TX indicator is activated. The quiescent state current is measured when
all the common condition relays except the common fault relay are de energised. No power output
current was included.
Typical current consumption for each module is listed on Table 36 and Table 37 with their respective
combination.
Table 36 Current Consumption of Function Modules
Type
Part No.
Quiescent Current, I
Q
Alarm Current, I
act
Basic System
SUB880, SUB881, SUB882
90 mA
231 mA
8 Zone Expansion Board
SUB883
72 mA
73 mA
8 Relay Expansion Board
SUB885
14 mA
138 mA
4 Supervised Output Expansion Board
SUB886
14 mA
54 mA
Zone Display Board
SUB884, SUB891
1 mA
2.1 mA
Basic OWS
SUB887, SUB888, SUB891
1 mA
18 mA
OWS Tone Selection Display Board
SUB889, SUB891
1 mA
17 mA
OWS PA Zone Control Display Board
SUB889, SUB891
1 mA
34 mA