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TOSHIBA
44
UPS Protection System (cont'd)
System Protection Functions (cont'd)
Built-In UPS Fault Protection Functions (cont’d)
Protection Item
Internal Overheat DC Circuit
Overvoltage
DC Circuit
Overcurrent
LCD Message
Cause
Fan failure;
High ambient
temperature
Chopper
malfunction
Inverter/chopper
fault
Operation
Mode After
Fault
Bypass operation;
Chopper and inverter are stopped
Inverter OL: Transfer to bypass;
Audible Alarm
Yes; continuous buzzer
Visible Alarm
Red Fault LED “on”
Relay Contact
Alarm
Faulty relay closed;
Bypass relay closed
Auto-retransfer
No
Built-In UPS Fault Protection Functions (cont’d)
Protection Item
DC voltage
unbalance
LCD Message
Cause
UPS fault,
Connection of a halfwave rectifier load
Operation
Mode After
Fault
Shutdown; no output
Audible Alarm
Yes; see page 26 “Audible Alarm Functions”
Visible Alarm
Red fault LED “on”
Relay Contact
Alarm
Faulty relay closed
Auto-retransfer
No
OVER HEAT DC-OV
DC-OC
DC UNBALANCE