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

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 60