Powerware 9335 User Manual download pdf (Page 34)

5-4 Powerware 9335 (80 kVA and 120 kVA) Installation and Operation

164201396 REV A 071103

5.2.1 Normal Mode

Figure 5–2 shows the path of electrical power through the UPS system when the UPS is

operating in Normal mode.

Battery

Charger

RectifierInput Filter Booster

Inverter

Battery

Breaker

Breaker Contactors

Closed

Open

Battery

IA2

IA1

Switches

Main Power

Trickle Current

Energized

De-Energized

Normal Mode

Figure 5–2. 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 contactor K1 (and externally protected utility feed). “Load Protected”

appears on the LCD display 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, regulated DC voltage to the inverter.

A separate internal battery charger is used to maintain the proper charge level on the

battery during normal operation. The battery charger derives its input from the booster

output and provides regulated DC voltage and charge current to the battery. The battery

charge condition is monitored by the UPS and, when abnormal, reported by the status

indicators located on the LCD display. The battery is always connected to the UPS and

ready to support the inverter should the utility input become unavailable.

Static Switch

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Powerware 9335 User Manual Page 34