Toshiba 1600XP UPS Protection System, System Protection Features, System Protection Functions

22. UPS Protection System

22.1 System Protection Features

The following schematic shows the electrical locations of the protection devices on the UPS.

MCCB

Input	Line Filter
Power
	Surge
	Absorber

Input

Abnormal

Overheating		Overcurrent	Current Limit
			Overload
Bypass	*Static Switch
			Isolation
Input		Output	Transformer
Fuse		Fuse	Output
Rectifier/		Inverter
Chopper			Power
Batteries	+	* Switches are
	–
		solid state	Power Flow
Negative		devices.

	Bus	Overvoltage/
Low Battery
		Undervoltage
Level

22.2 System Protection Functions

The following charts show the built-in system fault protection functions on all the UPS models.

BUILT-IN UPS FAULT PROTECTION FUNCTIONS

Protection Item	Output Overvoltage		Output Undervoltage	Output Overload
LCD Message	OUT-OV		OUT-UV	OVERLOAD
Cause	Control malfunction;		Control malfunction;	Overload – Short circuit at load
	EEPROM error		Fuse opened; Load issue
Operation Mode	Bypass operation – Chopper and inverter are			Inverter OL: Transfer to bypass;
				Bypass OL: Inverter, chopper
After Fault	stopped
				stopped
Audible Alarm	Yes – Continuous buzzer			See Audible Alarm Functions on
				page 33
Visible Alarm	Red Fault LED on			Inverter OL: Fault lamp off
				Bypass OL: Fault lamp on
Relay Contact	Fault relay closed			Fault relay open;
				Inverter OL: Bypass relay closed
Alarm	Bypass relay closed
				Bypass OL: Bypass relay open
Auto-retransfer		No		Inverter OL: Yes if bypass is OK
				Bypass OL: No

46 1600XP Series Installation and Operation Manual