Toshiba t1000 Installation And Operation Manual page 58

TABLE 16-1: UPS FAULT PROTECTION FUNCTIONS (CONT'D)
Protection Item Ambient Overheat
LCD Message
Cause High internal ambient
Operation Mode
Shutdown – No output
After Fault
Audible Alarm
Visible Alarm
Relay Contact
Alarm
Auto-retransfer
UPS will attempt two sequential Auto-retransfers before requiring manual transfer.
48
AOH
Fan failure;
Chopper malfunction
temperature
Bypass operation – Chopper and inverter are stopped
Continuous buzzer
Red Fault LED on
Fault relay closed
Bypass relay closed
T1000 Series UPS Installation and Operation Manual – 91074-002
DC Circuit
Overvoltage
DCOV
Inverter/chopper fault
Inverter OL – Transfer to bypass
No
DC Circuit
Overcurrent
DCOC