System Fault Messages - Toshiba 4300 series Installation And Operation Manual

12.20

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.
Display Meaning
BYPOH Bypass Overheat – Overheating
condition occurred.
CL Current Limit – UPS not within
specifications.
COV Charger Overvoltage – Charger
overvoltage condition occurred.
DCOC DC Bus Overcurrent – DC overcur-
rent condition occurred.
DCOV DC Bus Overvoltage – DC over-
voltage condition occurred.
DCUB DC bus unbalanced.
DCUVBS DC Bus Undervoltage during
Boostup Mode – DC Bus under-
voltage condition occurred.
DCUVC DC Bus Undervoltage During
Charging Mode – DC Bus under-
voltage condition occurred.
DOH Device Overheat – Overheating
condition occurred.
OOC Output Overcurrent – UPS is over-
loaded.
PHBRER Bypass phase rotation error.
4300 Series Installation and Operation Manual
TABLE 12.5 - SYSTEM FAULT MESSAGES
Check unit for blocked or in-operable fan. Lower ambi-
ent temperature if it is greater than 104 °F (40 °C).
Bypass operation will also cease if overheat condition
is not corrected within 1 hr. of inverter shutdown. Try
restarting. If condition re-occurs plan for total shutdown
and call for service.
Contact the nearest Toshiba authorized representative
for service.
Contact the nearest Toshiba authorized representative
for service.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
UPS is possible faulty, input wiring error, input over-
voltage or connection of a motor load. Try restarting. If
condition persists call for service.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
Reduce equipment load to 100% or less and try re-
starting.
Shutdown excess equipment to reduce load.
Bypass phase rotation is reversed. Switch any two
input cable connections: A and B, B and C, or C and A.
Action
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