TOSHIBA

6.0 UPS Protection System

6.1System Protection Features

The preceding one-line schematic illustrates the electrical locations of the protection devices on all UPS models.

Input

Abnormal

MBS

Overheat

Isolation

Transformer

Model

Input

Power

Bypass

ConverterInverter

MCCB

Chopper

Overcurrent

Overload

Output

Power

Over-voltage/

Under-voltage

Low Battery

Batteries

6.2System Protection Functions

The following chart shows the built-in UPS fault protection functions on all models.

Built-in UPS Fault Protection Functions

 

Protection Item

 

Inverter Over-voltage

Inverter Under-voltage

 

UPS Overload

 

 

 

(IVOV)

(IVUV)

 

 

 

 

 

 

 

 

 

LCD Message

INVERTER

INVERTER

 

OUTPUT OVERLOAD

 

OVERVOLTAGE

UNDERVOLTAGE

 

 

 

 

Overload or short circuit at the load.

 

Cause

Control Malfunction;

Feedback Error

 

Operation Mode

 

 

 

Inverter Overload: Transfer to bypass; Inverter

 

Bypass Operation; Chopper and Inverter Stopped

 

stopped.

 

after Fault

 

Bypass Overload: Inverter, Chopper, and Bypass

 

 

 

 

 

 

 

 

 

 

stopped.

 

Audible Alarm

 

Yes: See Audible

Alarm Functions

 

Visible Alarm

Red Fault Lamp “on”

 

Inverter OL: No Fault Lamp

 

 

Bypass OL: Fault Lamp “on”

 

 

 

 

 

 

 

Relay Contact

 

 

 

Inverter OL: Bypass Relay closed

 

Fault Relay closed; Bypass Relay closed

 

Bypass OL: Bypass Relay open and Fault relay

 

Alarm

 

 

 

 

 

closed

 

 

 

 

 

 

 

Auto-Retransfer

 

No

 

Inverter OL: Yes, if bypass ok

 

 

 

Bypass OL: No

 

 

 

 

 

 

 

Protection Item

 

Low Battery Voltage

Low Battery Voltage

 

Inverter Output Current Limit

 

 

 

(Level-1)

(Level-2)

 

 

 

 

 

 

 

 

 

LCD Message

Line-4 will read

DC UNDERVOLTAGE

 

OUTPUT OVERLOAD

 

“BATTERY LOW”

 

 

 

 

 

 

 

 

 

Cause

Battery Discharge

Battery Shutdown Level

 

Load Inrush current

 

reached

 

 

 

 

 

 

If Bypass ok, transfer to bypass; if not, current-limit

 

Operation Mode

Battery Discharge

Shutdown:

 

 

after Fault

No Output

 

mode

 

 

 

 

Audible Alarm

 

Yes: See Audible

Alarm Functions

 

Visible Alarm

Battery Lamp Flickers

NO

 

NO

 

Relay Contact

Low Battery Relay

 

 

Bypass Relay closed

 

Alarm

closed

 

 

 

 

 

Yes, if bypass ok

 

Auto-Retransfer

 

No

 

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Toshiba 4200FA user manual System Protection Features, System Protection Functions

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