TOSHIBA

7.0UPS Protection System

7.1System Protection Features

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

Input

Power

Input Abnormal

 

MCCB

Isolating

Converter

XFMR

 

MBS

Bypass

Inverter

Overcurrent

Overload

Output

Power

Overcurrent Low Batteryt

Overvoltage/

Charger/Undervoltage

Chopper

External

Batteries

7.2System 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

(IVOV)

(IVUV)

 

 

UPS Overload

 

LCD Message

INVERTER

INVERTER

OUTPUT OVERLOAD

 

OVERVOLTAGE

UNDERVOLTAGE

 

 

 

 

 

Cause

Control Malfunction;

Feedback Error

Overload or short circuit at the load.

 

 

 

 

 

Inverter Overload: Transfer to bypass; Inverter

 

Operation Mode

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

Fault Relay closed; Bypass Relay closed

Inverter OL: 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

 

 

 

 

 

 

Operation Mode

Battery Discharge

Shutdown:

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

 

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

 

 

 

 

 

Auto-Retransfer

 

No

Yes, if bypass ok

4200FA CT/XT User’s Manual

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Toshiba 4200FA CT/XT user manual System Protection Features, System Protection Functions

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