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Fault Display status Probable cause Corrective action
Remove cause of
Output low Inverter fault or short short circuit. If none is
voltage circuit in UPS output found, contact your
Toshiba service
representative.
Output Resonance with load Remove load
overvoltage equipment equipment one piece
at a time.
DC Chopper fault Contact your Toshiba
undervoltage service representative.
Check for airflow
Cooling fin Cooling fan outage or restriction. If none is
overheating closed cooling airflow found, contact your
path Toshiba service
representative.
Battery damaged or
Battery something wrong in the Contact your Toshiba
problem battery circuit (battery may service representative.
not be connected)
Output Capacity of load Review UPS rating
overload equipment to high or reduce load
equipment.
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. "Troubleshooting" involves monitoring
the bar graph 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. These faults normally will
cause the UPS to transfer to bypass mode. Use "System Restart" procedures (see
Section 5.10) to transfer the UPS back to On Line mode. Use the following chart to
decode the display. All non-fatal faults will cause the red Fault LED to flash.
Non-Fatal Fault Mode Display Chart
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