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4400 Series Installation and Operation Manual – 64527-008
12.21 System Fault Messages
A Fault message is generated when either a fault condition occurs, or a warning condition occurs three times within ten
minutes. The table below shows the possible fault messages and what actions need be taken.
If the input voltage is normal when the fault occurs then the UPS will switch immediately to the bypass mode to continuously
feed power to the load.
If the fault condition occurs while the input power is abnormal and the UPS is in Bypass mode the UPS will shut down the
output to prevent load equipment damage.
When a Fault condition exists, the red LED on the UPS display panel will illuminate until the fault is cleared.
TABLE 12.4: SYSTEM FAULT MESSAGES
System Fault Messages
Display Meaning Action
Display Meaning Action
COC CHOPPER OVERCURRENT Contact nearest Toshiba Authorized service representative.
DBUSAB DC CIRCUIT ABNORMAL Contact nearest Toshiba Authorized service representative.
DCOV DC OVERVOLTAGE UPS is possibly faulty, input wiring error, input overvoltage or connection of a
motor load. Try restarting. If condition persists, call for service.
DCUB DC UNBALANCED Contact nearest Toshiba Authorized service representative.
DCUV DC UNDERVOLTAGE UPS is possibly faulty, input wiring error, input overvoltage or connection of a
motor load. Try restarting. If condition persists, call for service.
DMYFLT DUMMY FAULT Used by Engineering to troubleshoot issues.
DOH OVERTEMPERATURE Reduce equipment load to 100% or less and try restarting.
EPOTR / EPO EMERGENCY STOP ACTIVATED Emergency stop activated. Restart UPS after Emergency cleared.
GVERR CONTROL POWER SUPPLY ABNORMAL Contact nearest Toshiba Authorized service representative.
INABNL INPUT CIRCUIT ABNORMAL Contact nearest Toshiba Authorized service representative.
INVABN INVERTER VOLTAGE ABNORMAL Voltage out of spec. Contact nearest Toshiba Authorized service representative.
INVBYP UPS CONTROL CIRCUIT ERROR Inverter voltage/Bypass Voltage is out of spec. Contact nearest Toshiba
Authorized service representative.
INVCER OUTPUT CIRCUIT ABNORMAL Contact nearest Toshiba Authorized service representative.
INVERR UPS CONTROL CIRCUIT ERROR Inverter voltage is out of spec. Contact nearest Toshiba Authorized service
representative.
INVOC INVERTER OVERCURRENT Contact nearest Toshiba Authorized service representative.
INVOV INVERTER OVERVOLTAGE Contact nearest Toshiba Authorized service representative.
INVUV INVERTER UNDERVOLTAGE Contact nearest Toshiba Authorized service representative.
IOC INPUT OVERCURRENT Reduce Load. If problem persists, contact nearest Toshiba Authorized service
representative.
LDABNL LOAD ABNORMAL Lower load below 96%. If condition persists, Contact nearest Toshiba
Authorized service representative.
NOCONN No connection established Contact nearest Toshiba Authorized service representative.
OCERR Current is more than rated output current Lower Load and restart UPS. If condition persists, contact nearest Toshiba
Authorized service representative.
OVABNL OUTPUT VOLTAGE ABNORMAL Contact nearest Toshiba Authorized service representative.
PCBER UPS CONTROL CIRCUIT ERROR Check Fault Code on history log and present it to the nearest Toshiba
Authorized service representative .
PCHGER PRECHARGE FAULT Contact nearest Toshiba Authorized service representative.
PHBRER BYPASS PHASE ROTATION ERROR Bypass phase rotation is reversed. Contact nearest Toshiba Authorized service
representative.
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