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Troubleshooting
36 900-0114-01-00 Rev A
Error Messages
An Error message is caused by a critical fault. In most cases when this occurs, the unit will shut down
and the inverter’s ERROR LED (see page 11) will illuminate. See the system display manual for
instructions on viewing errors. One or more messa
ges will display
yes
. If a message says
no
, it is not
the cause of the error.
Error screens can only display errors; they cannot clear them. It is possible to clear an error by
resetting the inverter. The inverter must be turned off, and then on, to reset it. Other possible
remedies are shown below (although it is still necessary to reset the inverter).
Table 5 Error Troubleshooting
Message Causes Possible Remedy
low ac output
voltage
Inverter’s AC regulation cannot be
maintained under high load conditions.
Check loads and measure current draw. Remove loads as
necessary.
stacking error
detected
Programming problem among stacked
units. (Often occurs if there is no
master.) Can also occur when
ac output
backfeed
occurs.
Check stacking programming and designation of master. (See
page 24.)
Check for output backfeed from an ex
ternal source. Disconnect
output if necessary.
inverter
overtemp
Inverter has exceeded its maximum
allowed operating temperature.
Allow the inverter to remain off for a short time to reduce the
temperature, or add external cooling.
This error can occur without shutting off the inverter, if the
inverter is in Sell mode. (This error turns off the inverter’s
output, but not the input.) It may be necessary to manually
shut the inverter off. If an extra inverter is added to the system,
this will distribute the sell current more widely and allow each
unit to run cooler.
low battery
voltage
DC voltage is below Low Battery Cut-Out
(LBCO) set point.
This error can be triggered by other
causes. It can appear along with
low AC
output voltage, AC output shorted
, or
ac output backfeed
errors.
If this error accompanies other errors, treat those conditions as
appropriate.
If it occurs by itself: Recharge the batteries. The error will clear
automatically if an external AC source is connected and the
inverter’s charger comes on.
phase loss
error
A slave was ordered to transfer to AC by
the master, but no AC is present. The
unit continues inverting. This is the only
“Error” that is not accompanied by a
shutdown.
Check the AC voltage on the inverter input terminals. If AC
voltage is not present, problem is external. If AC voltage is
present, the unit may be damaged. Contact OutBack Technical
Support (see inside front cover of this manual).
high battery
voltage
DC voltage exceeded acceptable level
(specified on page 13).
Check the charg
ing source. This problem is usually the result of
external charging. This error will clear automatically if
conditions are removed.
ac output
shorted
Inverter exceeded its maximum surge
current due to severe overload.
Check the loads and wiring. This problem is more often the
result of a wiring error (a short).
ac output
backfeed
Usually indicates another AC power
source (out of phase with the inverter)
was connected to the unit’s AC output.
Disconnect the AC OUT wires from the inverter. Check the
wires (not the inverter) with an AC voltmeter. If an AC source is
present, shut it off.