Powerware 650825 kVA operation manual AC Input, Rectifier Input Breaker, Bypass Input Breaker

UNDERSTANDING UPS OPERATION

To UPS	To UPS	AC Input	AC Input
Rectifier	Bypass
Input	Input
	RIB		MBP
	BIB
		MIS
	Output
	from
	UPS
		MAINTENANCE
		BYPASS PANEL
		(Provided by Others)
			Backfeed
			Contactor
	Static
	Switch		K5
			Output	K3
			Contactor
				UPS
			Battery
			Breaker

BATTERY SYSTEM

CRITICAL LOAD

DISTRIBUTION UNIT

RIB:	Rectifier Input Breaker
BIB:	Bypass Input Breaker
MIS:	Maintenance Isolation Breaker
MBP:	Maintenance Bypass Breaker

NOTE If installing a maintenance bypass, a minimum of two separate feeds with upstream feeder breakers, or a single feed with two upstream feeder breakers, must be provided: one for the UPS or rectifier input breaker (RIB) (if installed) and one for the maintenance bypass input. DO NOT use a single feed or a single feeder breaker to supply both the UPS or RIB and the maintenance bypass. If a bypass input breaker (BIB) is installed in the maintenance bypass and a single−feed UPS is being installed, a single feed to the maintenance bypass is acceptable for supplying both the UPS and the bypass.

Figure 6-17. Simplified Dual−Feed UPS with Maintenance Bypass Panel

6−20 EATON Powerware® 9395 UPS (650–825 kVA) Installation and Operation Manual S 164201725 Rev 2 www.powerware.com