UPS Protection System (cont'd)
41
Protection Item
DC voltage
unbalance
Built-In UPS Fault Protection Functions (cont'd)
Cause
LCD Message
Operation Mode
After Fault
UPS fault,
connection of a halfwave rectifier load
Yes; see page 24 "Audible Alarm
Functions"
Audible Alarm
Visible Alarm
Relay Contact
Alarm
Auto-retransfer
Protection Item
Built-In UPS Fault Protection Functions (cont'd)
LCD Message
DC circuit
overvoltage
DC circuit
overcurrent
Internal overheat
Fan failure;
high ambient
temperature
Chopper
malfunction
Inverter/chopper
fault
Operation Mode
After Fault
Bypass operation;
chopper and inverter are stopped
Visible Alarm
Audible Alarm
Cause
Relay Contact
Alarm
Auto-retransfer
No
Fault relay closed;
bypass relay closed
Yes; continuous buzzer
RED fault lamp "on"
Fault relay
closed
No
TOSHIBA
System Protection Functions (cont'd)
DC-OV
DC-OCOVER HEAT
DC UNBALANCE
Shutdown; no output
RED fault LED "on"
General
Safety
Inspections &
Precautions
Connections
Equipment
Equipment
Specifications
EquipmentDisplay
Screens
Manual
Run/Stop
Protection
System
Maintenance
& Options
Dimensions &
Weights
Index
Reference
Operations
Key Functions
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