Meridian America 21 Benutzerhandbuch

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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.

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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