Battery Back-Up Wiring Installation; System Back-Up Duration - Vodavi Starplus Triad 1/2/3 Installation Manual

3-24

Battery Back-up Wiring Installation

As indicated in
operation from external batteries if local AC power fails. The Back-Up
batteries are connected to the terminal block of the BKSU/EKSU1
cabinets.
The external batteries must provide 24 volts DC. This is generally
accomplished by connecting two 12 volt batteries in a series
arrangement. Operation on batteries is controlled by the BCU. This BBU
provides charging current to the batteries during normal AC power
operation at a maximum of about 1 amp.
During battery operation, the PSUs discontinue battery operation if the
AC power is reapplied or the battery voltage is too low to maintain
proper system operation. If a low-battery cutoff occurs and a new battery
is installed, it is necessary to reset the Battery Back-Up circuit in the PSU
manually by momentarily depressing the orange colored BATT RESTART
switch located on the face plate of each PSU. Note that the Battery
Back-Up circuit in both PSUs of a two cabinet system must be reset.
The length of time the system operates on the batteries is dependent on
several elements: battery charge state, condition of the batteries,
capacity of the batteries, and the size of the system (number of station
ports).
The following table gives the approximate backup time for several
system sizes and different battery capacities in ampere-hours.
Figure
Table 3-2: System Back-Up Duration
Battery
Capacity
20 amp/hr 4 Hour
40 amp/hr 8 Hour
3-2, the Triad 3 System can be equipped to provide
36 82
Ports Ports
1.5 Hour
3 Hour
Power Supply Unit Installation
132
Ports
1/2 Hour
1 Hour