Comdial FX Series Dokumentacja Strona 29

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Using the Battery Backup
What the battery
backup does
Should the AC power to the system be interrupted, the external battery assembly
provides one hour of operation for a fully loaded system
During AC operation, the external battery assembly accepts re-charging current to
maintain the voltage potential of its batteries at an operational level. The battery
backup’s measured voltage is 34.5 volts when the batteries are fully charged.
Battery backup
components
The battery backup assembly includes the following items:
five, 6-volt, 10 ampere-hour batteries,
interface cable,
metal enclosure with wire harness, includes 6 AMP fuse.
How to
calculate
backup time
Calculate the minimum battery backup time provided by a battery backup
assembly to a fully configured FX II using the following formula:
T=
Ke
1 + [(0.084) (N)]
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 an FX II supporting 80 telephones and containing
one line board along with a battery backup assembly to provide back-up power.
T=
(.82)(10)
=
8.2
= 1.062 hours
1 + [(0.084)(80)] 7.72
NOTE: The external battery assembly requires a maximum of 10 hours to charge to full capacity
after it has been completely discharged and, in some cases, when initially installed.
Reviewing the Hardware – 25
General Description GCA40–242
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