Powerware 9330 operation manual Normal Mode

6.2.1Normal Mode

Figure 6---2 shows the path of electrical power through the UPS system when the UPS is operating in Normal mode.

NORMAL MODE

		STATIC
MAINTENANCE	K5	SWITCH
BYPASS SWITCH

RECTIFIER	BOOST	INVERTER
	CONVERTER
CB1 K1		K3
		MAINTENANCE
		BYPASS SWITCH
CHARGER	K2
		Main Power Flow

Breakers Contactors
Closed	CB2
Open

BATTERY

Trickle Current

Energized

De--Energized

Figure 6 ---2. Path of Current Through the UPS in Normal Mode

During normal UPS operation, power for the system is derived from a utility input source through the input breaker CB1 and contactor K1. ”Normal” appears on the front panel and indicates the incoming power is within voltage and frequency acceptance windows. Three phase AC input power is converted to DC using a full---wave, six---pulse, solid---state rectifier block which supplies unregulated DC voltage to a boost converter which in turn supplies a higher and regulated DC voltage to the inverter. The battery is not charged directly from the unregulated rectifier. Instead, a separate battery charger is used to maintain the proper charge level on the battery during normal operation.

6--4	Powerware 9330 (10 kVA--40 kVA) Installation and Operation
	164201300 REV. G 061502