APC AP9606 Specifications download pdf (Page 19)

Chapter 2. APC hardware and software background 11

2.2.1 Symmetra Masterframe/Miniframe

The Symmetra is an uninterruptible power array system, designed for large-scale

loads. It provides conditioned, reliable AC power to load equipment, and provides

protection from power blackouts, brownouts, swells, sags, surges and

interference. The Symmetra Power Array system comprises either a Miniframe or

a Masterframe, and a variable set of modules (see 2.2.1.4, “VA ratings” on

page 12). Both battery modules and power modules are available.

A battery module contains 4-12 batteries to increase the run time of a Symmetra

Power Array. A power module has a main intelligence module (2.2.1.2, “Control”

on page 12) and some power supplies that provide power to the battery charger

and the MIM. You can use two or more battery modules, but you must use one

power module. The small modules are Miniframes and the larger modules are

Masterframes.

A Miniframe system can be configured to deliver a maximum output of 8 kVA, and

a Masterframe system can deliver a maximum of 16 kVA.

Figure6. SymmetraMasterframeandMiniframe

The power processing system delivers conditioned AC output power with a

low-distortion sine wave. Under normal operating conditions, power is received

from the AC main (utility) power source, conditioned by the power processing

system, and delivered to the load equipment. In the event of an AC main power

source failure, the power processing system receives power from the battery

source (battery modules), converts it to conditioned AC, and delivers it to the load

equipment. When the AC main power source is present, the power processing

system also maintains the battery source at full charge.

The power processing system in Symmetra is comprised of one or more power

modules. Each power module contains the electronic components for a complete

4 kVA UPS, including the rectifier, charger, and inverter. When two or more power

modules are present, they operate in parallel, sharing the load equally. By

configuring the system with at least one more power module than is required to

power the load (a redundant power module), Symmetra can sustain a power

module failure and still deliver full power to the load equipment. When the failed

module is identified by the control/user interface system, an alarm is initiated to

notify the user of the module failure. The hot-swappable module can be replaced

by the user, without the need to power down the load equipment.

A Symmetra Miniframe provides bays for up to three power modules, and a

Masterframe provides bays for up to five. This affords the full system capacity

(8 kVA and 16 kVA respectively), plus one redundant power module.

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APC AP9606 Specifications Page 19