User's Manual

Reserve power

Reserve power is available for both AC and DC systems. AC reserve power is

provided by a separate Uninterruptible Power Supply (UPS), installed in series

with the main system AC power feed. A UPS generally consists of a

combination battery charger (AC-DC converter) and inverter (DC-AC

converter), along with its associated batteries. The batteries may be internal or

external to the UPS unit itself.

DC systems use the “traditional” telecommunications powering method of an

external power plant consisting of rectifiers (AC-DC converters) continuously

charging a bank of batteries, while the system power rails “float” in parallel on

the battery voltage.

AC reserve power

There are a wide variety of UPS vendors and systems available. Some of the

factors to consider when choosing a UPS are:

Input and output voltage and frequency range

Number and type of output receptacles

Regulatory and safely agency approvals

Efficiency, crest factor, and other performance considerations

Alarm and status indications

Battery recharge time

Backup time required

-Existing batteries or other power equipment at the site

Planned system growth

Power engineering 553-3001-l 52