Brooks FireTracker FT2GAS, Руководство по эксплуатации и техническому обслуживанию, Страница: 24 / 58

FT2GAS
Gaseous Extinguishing System
Rev No. 1.3
24
2.6.2 PSU Supervision
The system constantly monitors the mains power supply, battery charger voltage and batteries and will
initiate a PSU fault if the voltage of the charger or batteries exceeds the limits as in Table 13.
Table 13 Power Supply Supervision Characteristics
Characteristics Threshold
Secondary Low Fault 24V, Measured on the battery terminals
Battery Automatic Cut Off 20.7V, Measured on the battery terminals, when the mains is not available.
Main Power High Fault
30.5V, Measured on the main power source output terminals
Main Power Low Fault 22.1V, Measured on the main power source output terminals
Secondary Charging
Voltage Low Fault
24.3V, Measured on the battery terminals
Automatic Battery Test
The system automatically runs on battery only for one hour every 70 hours and
closely monitors battery voltage during this period. The test terminates
automatically should any power supply fault or alarm condition was detected.
2.6.3 PSU Current Calculations
The following shall be calculated according to the application requirements of the related current
standards, such as AS7240.2, AS1670.1, NZS4512 and AS4214.
1. Battery capacity calculation
2. AC/DC power supply current capacity requirement
The typical system current consumptions are listed below.

Quiescent Current, I
Q
= 75 mA

Alarm Current, I
A
= 250 mA
The alarm state current is measured when two zones are in high priority alarm conditions, all the outputs
are activated. The quiescent state current is measured when all the common condition relays except the
common fault relay are de energized. No power output current has been included.
WARNING : The current consumption data above does not include any current supplied to the external
devices. The actual current consumption shall be re-calculated based on the actual system
configurations. Refer to the power and battery calculation spreadsheet in Appendix D on page 39.