T1X06000GA-N1-R3 datasheet(40/118 Pages) TOSHIBA

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T1000 Series UPS 5.6-6kVA Installation and Operation Manual – 91074-005

12. Operating Modes

12.1 Static-Bypass (Stop operation)

During power up the UPS starts up in Bypass mode except when:

•

Performing cold start operation.

•

Performing frequency conversion.

•

When input and output voltages are unequal causing bypass to be disabled.

If the UPS unit is severely overloaded or develops an internal fault, power flow is automatically switched

from the unit’s main circuit to the bypass circuit. Power flow through the bypass is shown in the following

illustration. This change-over occurs automatically in phase in less than one-quarter cycle of the input

waveform. The switching period is not long enough to cause interruptions to occur in most loads.

• If the power flow is transferred to the bypass circuit due to an internal fault the UPS will continue to

supply power to the load through the bypass and indicate a system fault message (see “16.3 System

Fault Messages” on page 49).

• If the power flow is transferred to the bypass circuit due to an overload condition (see “16.4 System

Warning Messages” on page 50), then the power flow will automatically transfer from the UPS’s

bypass circuit back to the inverter circuit after removing the overload if set to do so (Under

Setting >

Status Config & Ctl, set En AutoXfer to Enable).

NOTE: Bypass will be automatically disabled if the rated input and output voltages or frequencies are dif-

ferent.

12.2 On-Line (Run operation)

The following illustration shows circuit power flow when the UPS is operating normally in the Online Mode.

The UPS rectifier, including a boost chopper circuit, converts AC input power to DC power. The boost

chopper circuit maintains a constant voltage, with current limiting, for charging the batteries. The inverter

section generates a high quality sinusoidal output voltage. The unit’s batteries are always maintained in a

constantly charged state when the UPS is in the run operation mode.

FIGURE 12-1: POWER FLOW IN BYPASS FOR ALL MODELS

Output

Power

Line Filter

Inverter

*Static Switch

(Optional)

Auto-

Transformer

Input

Power

Input

Fuse

Power Flow

Bypass

* Switches are

solid state

devices.

MCCB

Output

Fuse

Batteries

–

Rectifier/

Chopper

Negative Bus

MOV Over-

current

Protection

Output

Power

Line Filter

Inverter

*Static Switch

(Optional)

Auto-

Transformer

Input

Power

Input

Fuse

Power Flow

Bypass

* Switches are

solid state

devices.

MCCB

Output

Fuse

Batteries

–

Rectifier/

Chopper

FIGURE 12-2: POWER FLOW IN ONLINE MODE FOR ALL MODELS

Negative Bus

MOV Over-

current

Protection

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