APC SU042-1 3000 VA User Manual download pdf (Page 19)

Redundant Switch - Applications Guide March 22, 1999

Application #6. Smart-UPS Bypass

Configuration

Power to

Redundant Switch

Redundant

Switch

Power

to Load

communications

Surge Arrest

Rackmount

EPO

Emergency

Power Off

Function

StatusSelect

To UPS BAC SourceTo UPS A

Level

Source selectedBright

Source OK, but not selectedDim

Source not OKOff

To Server

Redundant Switch

Goals and objectives

Redundant Switch can be used with a single Smart-UPS unit to provide bypass functionality. Redundant

Switch allows the user to service or upgrade the Smart-UPS in the application without interrupting power

to the load (no need for scheduling downtime).

The Surge Arrest Rackmount Unit provides surge filtering to the loads when you select power from source

B at the Redundant Switch front panel. A surge could effect load operation and functionality when

Redundant Switch is in bypass mode and an APC Surge product is not in the bypass path. For this reason,

APC’s Equipment Protection Policy does not apply to a bypass configuration without an APC Surge

product in the bypass path.

Redundant Switch Function Settings

Use the factory preset settings (defaults).

Installation

Smart-UPS unit: Follow the instructions and procedure given in the Smart-UPS User’s Manual or Smart-

UPS Rack Mount Supplement.

Redundant Switch: Redundant Switch mounts in the front or the rear of a standard 19” cabinet, occupying

1U of rack space.

Follow the Redundant Switch User’s Manual Initial Start-Up instructions.

Power the critical loads that you will need to keep up during Smart-UPS maintenance or a Smart-UPS

upgrade through Redundant Switch. Power non - critical loads directly from the Smart-UPS unit.

Operation

The Smart-UPS unit communicates directly with the server, The Smart-UPS units provides power to the

server through Redundant Switch, Source A. Redundant Switch has Source A set as the preferred source.

To bypass the Smart-UPS unit, switch the preferred source to source B (at the Redundant Switch front

panel). When the service or upgrade tasks complete, switch the preferred source back to source A (at the

Redundant Switch front panel). Refer to the Redundant Switch User’s Manual.

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APC SU042-1 3000 VA User Manual Page 19

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