System Wiring; Battery Backup Wiring Installation; Battery Back-Up Wiring - Vodavi STARPLUS Triad XTS Installation Manual

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System Wiring

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:

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.

PSU

24VDC

Red

Figure 3-32: Battery Back-Up Wiring

Table 3-22: System BackUp Duration

Ports

20AH

5.5 Hours

3.5 Hours

2.25 Hours

Blue

Battery

12VDC

Battery Capacity

40AH

11.0 Hours

7.0 Hours

4.5 Hours

Chapter 3 - System Installation

3-59

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