APC MGETM GALAXYTM 6000 User Manual download pdf (Page 18)

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UPS theory of operation

Unitary UPS

The unitary MGE

TM

Galaxy

TM

6000

UPSs are made up of five modular

sub-assemblies:

◗ rectifier-charger;

◗ battery;

◗ three-phase inverter;

◗ static switch;

◗ maintenance bypass.

The load and Mains 2 operate at 50

or 60 Hz.

Mains 1 power up

◗ the inverter receives power from

the rectifier-charger and supplies

power to the load. There is no

direct connection between Mains

and load;

◗ the battery is charged or the

charge maintained.

Mains 1

rectifier-

charger

battery

inverter

load

static by-pass switch

Mains 2

Mains 1 power down

◗ the inverter receives power from

the battery and supplies power to

the load;

◗ the battery discharges.

Mains 1

rectifier-

charger

battery

inverter

load

static by-pass switch

Mains 2

Major overload

◗ Mains 2 supplies power to the

load via the static switch;

◗ the inverter is shut down;

◗ the inverter starts-up

automatically as soon as overload

is removed;

◗ power is transferred without

affecting the load.

Mains 1

rectifier-

charger

battery

inverter

load

static by-pass switch

Mains 2

Maintenance

◗ Mains 2 supplies power to the

load via the maintenance bypass;

◗ the rectifier-charger and inverter

are shut down and disconnected

from all sources of power.

Q1

Q5N

QF1

Q3BP

Q4S

Mains 1

rectifier-

charger

battery

inverter

load

static by-pass switch

Mains 2

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 37 38

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