- Eaton UPS User's Guide

OPERATION

Eaton 9170

UPS (3–18 kVA) User's Guide S 164201393 Rev E www.eaton.com/powerquality

Off mode turns off the output and most internal circuitry. Within this

mode, Sleep mode turns off all internal circuitry when AC line is not

present and battery voltage drops to a low threshold. If AC input voltage

is not present in Off mode, the user can direct the UPS to enter Sleep

mode by selecting the Battery Protect (BP) feature (see “Removing

Input Power” on page 79). When AC input voltage returns in the Off

mode (caused by a low battery alarm condition), the UPS automatically

recovers and, if the Auto Restart parameter is enabled, switches to

Double Conversion mode. Auto Restart is enabled as a factory-default.

After a discharge and subsequent low-battery shutdown, the UPS

automatically recovers from Sleep mode if the Auto Restart parameter is

enabled.

Figure 53 shows the basic functional elements of the UPS.

Isolation

Transformer

(an option only

provided

on units

manufactured

before 2009)

Input

(utility)

Power

Input Power (boost)

Converter

Internal DC

Power Bus

DC/AC Power Inverter

Output Relay

Bypass Relay

Capacitor Bank

Battery Charger

Battery

Modules

(parallel)

Line/Battery

Relay

EMI/RFI

Filter

Figure 53. Eaton 9170+ UPS Functional Block Diagram