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Battery backup (on batteries), Epo (emergency power off) function – Toshiba UNINTERRUPTIBLE POWER SYSTEM 1600XP User Manual

Page 38

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1600Xp Series installation and operation manual

Battery Backup (On batteries)

The following illustration shows power flow during the battery backup mode. When commercial AC power

failures occur, the UpS’s batteries instantly begin supplying dC voltage to the UpS’s main inverter circuit.

this circuit changes (inverts) the dC power into AC power. the AC power is available at the output of the

unit.

this back-up process will continue until the UpS’s battery voltage drops below a specific minimum level.

when this occurs, the batteries will stop supplying power to the load. this minimum level is the rated

minimum voltage (Vmin). the rated battery voltage chart on

page

28 shows (Vmin). the battery backup

time and discharge process is explained on

page

28.

EPO (Emergency Power Off) Function

these units are equipped with terminals for receiving an emergency power-off (epo) command via a

closed-contact switch at a remote location (see terminal block details on

page

13 and terminal block

location on

pages

65-66). this safety feature enables quick shut-down of the UpS’s AC output and

battery circuits.

Usually the emergency power off switch is installed in a central location that is easily accessible to

personnel concerned with the operation of the UpS unit and the load equipment connected to it. the epo

function is initiated by pressing the switch to the closed (shutdown) position.

the effect of using the epo switch is the same whether the UpS unit is in AC input mode, battery backup

mode, or the circuit bypass mode. The following figure shows the UPS condition after application of the

epo switch.

POWER FLOW IN BATTERY BACKUP FOR ALL MODELS

Output

Power

Line Filter

*Static Switch

Isolation

Transformer

Input

Power

Input

Fuse

Power Flow

Bypass

* Switches are

solid state

devices.

MCCB

Output

Fuse

Surge

Absorber

Batteries

+

Rectifier/

Chopper

Inverter

Negative Bus

POWER FLOW AFTER AN EPO COMMAND FOR ALL MODELS

Output

Power

Line Filter

Inverter

*Static Switch

Isolation

Transformer

Input

Power

Input

Fuse

Power Flow

Bypass

* Switches are

solid state

devices.

MCCB

Output

Fuse

Surge

Absorber

Batteries

+

Rectifier/

Chopper

Negative Bus