TOSHIBA
23
7.0 Troubleshooting
Procedures
Faults are those abnormal conditions that can occur and cause the unit to shutdown normal
operation. The faults are detected by the protection circuitry (See System Protection Features
Section 5.2) in the unit. The UPS FAULT lamp will light red whenever a fault condition has been
detected. “Troubleshooting” involves monitoring the OUTPUT/BATTERY level meter lamps on
the front panel and then interpreting the readout by using the fault mode display charts.
7.1
Non-Fatal Fault Mode
Non-fatal faults may or may not cause the unit to shut down; non-fatal faults normally will
cause the UPS to transfer to bypass mode. Use System Reset procedures (See Section
5.10). Use the following chart to decode the display.
Non-Fatal Fault Mode Display Chart
Fault
Display Status
Problem Cause
Corrective Action
Output low
voltage
Red and
Green
LED flash
alternately
Inverter fault or short
circuit in UPS output
Remove cause of
short circuit. If none is
found, contact your
Toshiba service
representative.
Output
overvoltage
Red and
Green
LED flash
alternately
Resonance with load
equipment
Remove load
equipment one piece
at a time.
DC
undervoltage
Red and
Green
LED flash
alternately
Chopper fault
Contact your Toshiba
service representative.
Cooling fan
overheating
Red and
Green
LED flash
alternately
Cooling fan outage or
closed cooling airflow
path
Check for airflow
restriction. If none is
found, contact your
Toshiba service
representative.
Battery
problem
Red and
Green
LED flash
alternately
Battery damaged or
something wrong in the
battery circuit (battery not
connected)
Contact your Toshiba
service representative.
