
3.10 Using The Battery Backup
What the
battery
backup does
Should the AC power to the system be interrupted, the external battery assembly provides 1.0
hour of operation for a fully loaded system.
During AC operation, the external battery assembly accepts charging current to maintain the
voltage of its batteries. The measured voltage of the battery backup is 34.5 volts when the
batteries are fully charged.
Battery
backup
components
The battery backup assembly includes the following items:
•
Batteries: Five 6-volt, 10 ampere-hour, charger unit, and interface cables.
•
Metal enclosure with wire harness, includes 10 AMP fuse.
How to
calculate
backup time
Calculate the minimum battery backup time provided by a battery backup assembly to a fully
configured FXT system using the following formula:
T = Back-up time in hours
K=0.85 (Constant)
e = 10 (ampere-hour capacity of battery backup assembly)
N = Total number of stations
Example:
Assume that you have installed a FXT System supporting 80 telephones and containing one line
board along with a battery backup assembly to provide back-up power.
NOTE: The external battery assembly requires a maximum of 10 hours to completely recharge to full
potential after it has been completely discharged and, in some cases, when initially installed.
General Description 3 – 11
General Description GCA40–215
T =
Ke
1 + [(0.084) (N)]
T =
(.82)(50) 8.2
1 + [(0.084) (80)]
=
7.72
=
1.062 Hour
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