UNDERSTANDING UPS OPERATION

Bypass

Breaker

(CB4)

Bypass Input

Input

Breaker

Rectifier (CB1

Input

Rectifier

K1

Static

Switch

K5

Inverter

K3

Output

Breakers Contactors

Closed

Open

Battery

Converter

K2

Battery

Breaker

Battery

Main Power Flow

Trickle Current

Energized

De−Energized

NOTE On an UPS configured as an IOM, the bypass input, static switch, bypass breaker (CB4), and K5 are not present.

Figure 6-4. Path of Current Through the UPS in Battery Mode

6−6

EATON Powerware® 9395 UPS (650–825 kVA) Installation and Operation Manual S 164201725 Rev 2 www.powerware.com

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Powerware 650825 kVA operation manual Path of Current Through the UPS in Battery Mode