Product Manual

Troubleshooting
54 900-0161-01-01 Rev B
Disconnect Messages
Disconnect messages explain why the inverter has disconnected from an AC source after
previously being connected. The unit returns to inverting mode if turned on. The
Last AC
Disconnect
screen is viewed using the
AC INPUT
hot key on a MATE3-class system display.
One or more messages will display
Y
(yes). If a message says
N
(no), it is not the cause of the
disconnection. The system display may generate a concurrent event and warning message
following the disconnection. (See page 52.) If the AC source is removed, the warning will be
blank, but the cause of the last disconnection will remain.
Disconnect messages only display the reason for the disconnection; they cannot correct it. It is
usually the result of external conditions, not an inverter fault. If the condition is corrected, the
inverter will reconnect. A few settings can be changed to accommodate AC source problems.
The reasons shown in the
Sell Status
menu for ceasing to sell power (see next page) may be
the same as disconnect messages. If the
Grid Interface Protection
settings are exceeded
(see page 15), the inverter will disconnect from the utility grid.
Table 10 shows the primary seven reasons for disconnection. An eighth field may be visible,
but it can feature several different messages which vary with conditions. A list of these
messages and their definitions is featured on the OutBack website at www.outbackpower.com.
Table 10 Disconnect Troubleshooting
Message Definition Possible Remedy
Frequency Too
High
The AC source has exceeded
acceptable frequency levels.
Check AC source. If it is a generator, reduce speed.
Frequency Too
Low
The AC source has dropped below
acceptable frequency levels.
Check AC source. If it is a generator, increase speed.
Voltage >
Maximum
The AC source has exceeded
acceptable voltage levels.
Check AC source. The inverter’s acceptance range
is adjustable.
NOTE
:
Adjusting the range may accommodate a
problematic AC source, but it will not fix it.
Voltage <
Minimum
The AC source has dropped below
acceptable voltage levels.
Check AC source. The inverter’s acceptance range
is adjustable.
NOTE
:
Adjusting the range may accommodate a
problematic AC source, but it will not fix it.
Backfeed Usually indicates that another AC
source (out of phase with the inverter)
was connected to the AC output.
Can also occur if an out-of-phase AC
source is connected to the AC input.
Disconnect the
AC
O
UT
wires. Check the wires (not
the inverter) with an AC voltmeter. If an AC source is
present, shut it off. (This is more often accompanied
by an
AC Output Backfeed
error.)
Check input source and wiring. This can be caused
by a source with phase problems.
Phase Lock The unit cannot remain in phase with
an erratic AC source.
Check AC source. This can be caused by a generator
with a poorly regulated output. Some generators
perform this way when low on fuel. Use the
Generator
input mode if necessary. (See page 12.)
Island Detect The grid seems to be present but
normal grid conditions are not
detected. This can occur if the
Radian’s input is powered by another
inverter instead of the grid. It may be
the result of an open main disconnect.
Check all input disconnects or circuit breakers for an
open circuit. Check for any other inverters installed in
the system and disable them.
This may (rarely) occur with a generator. Use the
Generator
input mode if necessary. (See page 12.)