Seagate ST31230N/ND Guia de Instalação descarregar pdf (Página 43)

Installing the power supply 5-3

Power supply description

Standard 1.0 Option 11 EC Installation and Maintenance Guide November 1999

Power supply description

Introduction

The power for the EC 11 comes from a purpose-designed AC

power supply. This unit provides the +5 V, +12 V, and -12 V

needed by the EC 11.

The NTDK35AA power supply accepts 120 VAC/240 VAC

for use in North America. The NTDK35BA power supply

accepts 220 VAC only, and meets CISPR-B regulatory

requirements for use in some parts of Europe. The units are

functionally identical, and can be connected to external

battery backup for commercial environments.

The first slot on the far left side of the EC 11 cabinet contains

the EC 11 power supply. AC and DC backup battery input

connectors are on the bottom of the unit.

The front plate has two LED indicators:

• The DC indicator lights up to show that all outputs are

normal (that is, power is being supplied to the cards in

the EC 11).

• The Batt indicator lights up to show that a DC source

within the correct operating range is connected to the

battery connector. It is extinguished when the backup

battery is disconnected or is not present.

Front panel circuit

breaker

The power supply consists of an AC-to-DC board with

provisions for an external battery backup unit floating across

the output of the board, and a DC-to-DC board.

To remove AC power from the AC board and DC power from

the DC board, switch off the AC breaker on the front plate of

the power supply. When the breaker is off, power is removed

from the cards in the EC 11.

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Seagate ST31230N/ND Guia de Instalação Página 43