Using The Battery Backup - Comdial DXP Plus Manual

GCA40–130

3.11 Using The Battery Backup

What the battery Should the AC power to the system be interrupted, one external battery assembly
backup does
provides 1.0 hour of operation for a fully loaded system (for information on
battery backup time using expansion cabinets, see the section below, "How to
calculate battery backup time").
During AC operation, the external battery assembly accepts re-charging current to
maintain the voltage potential of its batteries at an operational level. The
measured voltage the battery backup is 34.5 volts when the batteries are fully
charged.
Battery backup You can only install one battery backup per system. The battery backup
components
assembly includes the following items:
•
•
How to
calculate
Calculate the minimum battery backup time provided by a battery backup
backup time
assembly to a fully configured DXP
T = Back-up time in hours
K = 0.85 (Constant)
e = 50 (ampere-hour capacity of battery backup assembly)
N = Total number of stations
Example:
Assume that you have installed a DXP Plus with three cabinets supporting 472
telephones and containing one line board along with a battery backup assembly to
provide back-up power.
T =
1 + [(0.084) (472)] = 40.65 =
NOTE: The external battery assembly requires a maximum of 10 hours to completely re-charge to full potential
after it has been completely discharged and, in some cases, when initially installed.
26 – Reviewing The Hardware
Batteries: Five 6-volt, 50 ampere-hour, (Comdial product code BT000-141),
charger unit and interface cables.
Metal enclosure with wire harness, includes combination circuit breaker,
on/off switch.
Ke
T =
1 + [(0.084) (N)]
(.82)(50) 41.0
DXP Plus General Description
Plus system using the following formula:
1.0 Hour