APC 6000 user manual UPS theory of operation, Unitary UPS

UPS theory of operation

Unitary UPS

The unitary MGETM GalaxyTM 6000	◗	rectifier-charger;	The load and Mains 2 operate at 50
UPSs are made up of five modular	◗	battery;	or 60 Hz.
sub-assemblies:	◗	three-phase inverter;
	◗	static switch;
	◗	maintenance bypass.

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.

static by-pass switch

Mains 2

rectifier-

chargerinverter

Mains 1

battery

load

Mains 1 power down

◗the inverter receives power from the battery and supplies power to the load;

◗the battery discharges.

Major overload

Mains 2

rectifier- charger

Mains 1

static by-pass switch

inverter

battery

load

◗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.

Maintenance

static by-pass switch

Mains 2

rectifier-

chargerinverter

Mains 1 load

battery

◗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.

Mains 2

rectifier- charger

Q1

Mains 1

Q3BP

static by-pass switch

Q4S

inverter

Q5N

load

QF1

battery

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