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Site Manual
Alarm 2000 Iss 5
23
3.3.6 Power Supply Supervision Module:
General
The power supply supervision module has been designed to meet the requirements of
AS4428.5. The module provides additional power supply supervision not available in the
AS1603.4 CIE.
The module constantly monitors the power supply status and upon detection of a fault
condition will within one hour signal a power supply fault.
Power Supply Fault
The power supply fault, open collector output (LED indication) and voltage free contact will
be activated if one of the following occurs:

Charger high : charger voltage is higher than 28.2V

Charger low : charger voltage is less than 26.5V

50% Battery capacity : battery voltage less than 23.8V

Power fail : voltage less than 21V

Battery disconnected

Auto battery test fail (latching LED)
Note: once the supply fault is rectified or the power restored, the power supply fault
LED will clear unless the fault occurred during the auto battery test.
Power Fail
A set of voltage free contact is available if the mains power is lost and battery voltage
becomes less than 21V.
Test Inhibit Facility (Optional)
If an alarm occurred during the one hour auto battery test, the test will terminate to ensure
sufficient power to the fire panel and the ancillary equipment in full alarm condition. Two
terminals are provided on the power supply supervision board to connect normally open
alarm contact as shown in the data sheet.
Battery Present Test
A battery present test is conducted by disconnecting the batteries from the system for
approximately 100mSec. On startup, the battery test is carried out once every 15 seconds
for the first 250 seconds then once every one hour. If the batteries are missing, the power
supply fault is indicated.
Note: A battery present test is not performed if a charger fault exists.
Auto Battery Test
An auto battery test is conducted approx. every 71 Hours where the system quiescent load
will be disconnected off the system power supply and placed on the batteries.
The auto battery test will not be conducted and will be terminated if one of the following
conditions is exist:

Battery missing or disconnected

Battery low (50% capacity) or fail condition

Charger high or low fault

If the auto-test inhibit input is activated.