Appendix B – Power
asafeinstall_dgb, AutroSafe Interactive Fire Detection System, Release 4,
116-P-ASAFE-INSTALL/DGB, Doc-1004796-2, 2021-08-23, Autronica Fire and Security AS
Page 84
16.14 Battery Resistance Measurement
Every fourth hour, battery impedance measuring is conducted.
This is conducted by lowering the PSU voltage so that all loads are
powered from the batteries for a period of 60 seconds, then a built in
resistor is turned ON for 2 seconds. BPS-410 will then measure the
voltage increase between the resistor ON and OFF and thus calculate
the battery resistance. This measurement includes the wires to and
from the battery.
The battery high resistance fault is given when the total resistance of
the battery and battery cables is:
Resistance
• If such a fault is given, check the cable resistance or replace
the batteries.
16.15 Electronic fuses
16.15.1 Power outputs
Power outputs A1, A2, B1, B2, C1 and C2 are protected by both
electronic and regular fuses. The electronic fuses will trip if a current
between 3.5A and 7A is drawn. The electronic fuse will turn OFF power
within approx. 10ms of a short circuit. The BSF-400 will try to turn ON
power 3 times with ~50s interval between each try.
If an external fault is not resolved, BSF-400 will not try to re-power more
than 3 times. A reset on an AutroSafe panel or pushing reset button S1
will force the BSF-400 to retry.
IMPORTANT: To be safe, remove regular fuse before troubleshooting
external faulty equipment.
16.15.2 Battery Input
The battery input is protected by an electronic short-circuit detector and
a regular fuse. If a short circuit is detected, the battery relay will turn
OFF within approx 50ms. The AutroSafe AutroFieldBus system will then
report “Battery not connected”.
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