Battery Backup Mode; Epo (Emergency Power Off) Function; Operating The Ups - Toshiba UE3G2L036C61T Instruction Manual

Uninterruptible power system single phase – 3.6/ 6/8/10 /14/18 kva /1600ep series
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Operating the UPS

Operation Modes (Cont'd)

Battery Backup Mode

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 unit's output. 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 22 shows (Vmin). The battery
backup time and discharge process is explained on page 22.
MCCB
Input
Line Filter
power
Surge
absorber

EPO (Emergency Power Off) Function

These units are equipped with terminals for receiving an emergency power-off (EPO) "closed
contact" switch command from a remote location (see 'terminal block details' on page 13 and
terminalblock location on page 45-46). 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 the ac input mode (see page 24), battery backup mode (see page 25), or the circuit
bypass mode (see page 24). The following figure shows the UPS condition after application of
the EPO switch.
TRIPPED
MCCB
Input
Line Filter
power
Surge
absorber
TOSHIBA
Bypass
*Static
switch
Input
fuse
Rectifier/
Chopper
+
Batteries
_
Power flow in battery backup mode for all models
Bypass
*Static
switch
Input
fuse
Rectifier/
Chopper
OFF
+
*Switches are
Batteries
solid state
_
devices
26
Output
fuse
Inverter
Line Filter
*Switches are
solid state
devices
Output
fuse
Inverter
Line Filter
OFF
Isolation
Transformer
Output
power
Power flow
Isolation
Transformer
Output
power
(off)
Power flow

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