Powerware 650825 kVA operation manual Main Power Flow Open

UNDERSTANDING UPS OPERATION

Bypass Input	UPS Input
	UPS 1
Battery
	UPS 2
Battery
	UPS 3
Battery

UPS 4

Battery

Breakers

Closed

Main Power Flow

Open

Tie Cabinet

UPS 1 Output

UPS 2 Output

UPS 3 Output

UPS 4 Output

Output to

Critical Load

Figure 6-20. Path of Current through the UPSs in Battery Mode – Distributed Bypass

If at any time during the battery discharge the input power becomes available again, the rectifier begins to supply DC current to the inverter. At this point, the UPS returns to Normal mode. If at any time during the battery discharge the AC input power becomes available again, each rectifier turns on, assumes the inverter load from the batteries, and begins recharging the batteries. Depending on the total load and the duration of the battery discharge, battery and rectifier input current limit alarms may be seen for a short time due to the current required to recharge the batteries.

EATON Powerware® 9395 UPS (650–825 kVA) Installation and Operation Manual S 164201725 Rev 2 www.powerware.com 6−25