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1600XP Series Installation and Operation Manual
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 Action
BYPOH Bypass Overheat – Overheating
condition occurred.
Check unit for blocked or in-operable fan. Lower am-
bient 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 shut-
down and call for service.
BYPOL Bypass Overload – UPS is over-
loaded.
Shut down excess equipment to reduce load.
CHRGOV Charger Overvoltage – Charger
overvoltage condition occurred.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
CLMT Current Limit – Load on UPS out-
put exceeds unit specications.
Reduce load on UPS output.
DCIB DC Bus Imbalance – DC voltage
imbalance occurred.
Possible causes are UPS fault are connection of half-
wave rectier load. Check load and try restarting. If
condition persists, call for service.
DCOC DC Bus Overcurrent – DC overcur-
rent condition occurred.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
DCOV DC Bus Overvoltage – DC over-
voltage condition occurred.
UPS is possible faulty, input wiring error, input over-
voltage or connection of a motor load. Try restarting. If
condition persists call for service.
DCUVBS DC Bus Undervoltage during
Boostup Mode – DC Bus under-
voltage condition occurred.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
DCUVC DC Bus Undervoltage During
Charging Mode – DC Bus under-
voltage condition occurred.
UPS is possibly faulty. Check the UPS operation
conditions at time of fault. Not advisable to restart the
UPS. Call for service.
DVCOH Device Overheat – Overheating
condition occurred.
Reduce equipment load to 100% or less and try
restarting.
FSOPEN Fuse Open. Replace fuse.
INVOLNR Inverter Overload (Not Reset-
table) – Output overload condition
occurred.
Reduce equipment load to 100% or less and manually
restart the UPS.