Powerware 9330 operation manual Maintenance Bypass Mode, Input Rectifier

MAINTENANCE BYPASS MODE

			STATIC
MAINTENANCE		K5	SWITCH
BYPASS SWITCH
		RECTIFIER	BOOST	INVERTER
			CONVERTER
CB1	K1			K3
				MAINTENANCE
				BYPASS SWITCH

CHARGER K2

Main Power Flow

Breakers Contactors		Trickle Current
Closed	CB2
		Energized
Open
		De--Energized

BATTERY

Figure 6 ---7. Path of Current Through the UPS in Maintenance Bypass Mode

6.3Functional Description

The UPS is a true online unit with a series power train. An uncontrolled rectifier feeds a boost converter, which in turn powers the inverter. The bypass utilizes a static switch and a maintenance bypass switch is internal to the unit. The unit input is 3---wire in (plus ground) at the rectifier and 4---wire in (plus ground) at the bypass, and 4 wire output. The unit does not incorporate any galvanic isolation, input to output. The battery string comprises 144 cells (288 volts nominal) and is charged via a buck or boost converter powered from the raw DC IN from the input rectifier.

6.3.1Input Rectifier

The Input Rectifier is a full wave bridge uncontrolled rectifier, which produces an unregulated DC IN Bus. The raw DC at this point will be approximately 290 VDC. A pre---charge system pre---charges the DC IN Bus prior to the input contactor being closed.

6--12	Powerware 9330 (10 kVA--40 kVA) Installation and Operation
	164201300 REV. G 061502