Vodavi STARPLUS Triad XTS, Installation Manual

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System Wiring 3-59
Chapter 3 - System Installation
System Wiring
Battery Backup Wiring Installation
The system can be equipped to operate from external batteries if local AC power fails. The
backup batteries are connected to the strip connector on the front of the PSU as shown:
Figure 3-32: Battery Back-Up Wiring
The external batteries must provide 24 Volts DC. This is generally accomplished by
connecting two 12-volt batteries per Cabinet in a series arrangement. Operation on batteries
is controlled by the PSU. The PSU provides charging current to the batteries during normal
AC power operation at a maximum of about 1 amp. After connecting the batteries for
backup, ensure that you turn the BATT.SWITCH (located on the faceplate of the PSU) to the
ON position so that when AC power fails the batteries will automatically provide power.
During battery operation, the PSU discontinues battery operation if the AC power is
reapplied or the battery voltage is too low to maintain proper system operation. If a low-
battery cut-off occurs and a new battery must be installed, turn the BATT. SWITCH to the OFF
position, replace the battery, then turn the BATT.SWITCH to the ON position.
The length of time the system operates on the batteries is dependent on several elements
including: battery charge state, condition of the batteries, capacity of the batteries, and the
size of the system (number of station ports).
The following chart gives the approximate backup time for several system sizes and different
battery capacities in ampere-hours.
Table 3-22: System BackUp Duration
Ports
Battery Capacity
20AH 40AH
32 5.5 Hours 11.0 Hours
64 3.5 Hours 7.0 Hours
96 2.25 Hours 4.5 Hours
PSU
Battery Battery
+ - - +
Red
Blue
24VDC
12VDC
12VDC