Toshiba 1600EP Series Protection Item, Internal Overheat, DC Circuit Overvoltage, Dc-Ov, Dc-Oc

Built-In UPS Fault Protection Functions (cont’d)

Protection Item	Internal Overheat	DC Circuit Overvoltage	DC Circuit Overcurrent
LCD Message	OVERHEAT	DC-OV	DC-OC
Cause	Fan failure;	Chopper malfunction	Inverter/chopper fault
	High ambient temperature
Operation Mode	Shutdown – No output	Bypass operation – Chopper and inverter are stopped
After Fault		Inverter OL – Transfer to bypass
Audible Alarm		Yes – Continuous buzzer
Visible Alarm		Red Fault LED on
Relay Contact		Fault relay closed
Alarm		Bypass relay closed
Auto-retransfer		No

1600EP Series Instruction Manual 43