900-00275-01-001 Rev A
83
Troubleshooting
Table 4
Troubleshooting
Symptom
Possible
Cause
LED Indicator
or Icon
Possible Remedy
Will not export
AC- coupled
power to the
utility grid
(See page 39)
Grid power
does not meet
requirements;
inverter will
usually
disconnect
Red/green LED
Red
grid icon
Verify grid voltage and frequency. Determine if they are within
the inverter’s approved limits. If not, the inverter is operating
correctly. Contact the utility company if necessary.
The inverter
has other
criteria which
must be met,
such as the
qualifying time
Gray
grid icon
Wait until qualifying timer expires.
All available
AC-coupled
power is used
by batteries
N/A
If the batteries need a full charge, this may consume all power.
Wait until charge is complete.
All available
AC-coupled
power is used
by loads
N/A
Reduce loads. (If loads are desired size, no action is required.)
GD inverter
problem
N/A
Confirm that the grid-direct inverter is operating correctly.
Unusual
voltage
on hot or
neutral output
line
System neutral
and ground
may not be
bonded
N/A
Using a handheld AC voltmeter, test the
N
,
L1
and
L2
L
OAD
terminals. (See page 80.) These measurements should give full
voltage. Test neutral and ground connections. This
measurement should read zero volts. Any other result means
neutral and ground are not bonded correctly. If this is the case,
the hot line often reads 60 to 75 Vdc and the neutral reads 45 to
60 Vdc with respect to ground. (If bonding is not required or is
prohibited by national or local codes, then no action may be
required.)
Unusual and
different
voltages on
AC hot input
lines
Input neutral is
not connected
correctly
Inverter may
also not
connect to
AC source
Loads may
behave
unusually
N/A
Test
L1
input and neutral connections with AC voltmeter.
Test
L2
input and neutral connections with AC voltmeter.
(This can be on
G
RID
or
G
EN
input, depending on where the
symptoms appear.) Test
L1
to
L2
input. From hot to neutral
should be approximately 120 Vac unless the output has been
adjusted.
L1
to
L2
should be approximately 240 Vac. If the two
outputs are different voltages but still add up to 240 Vac, the
neutral is not connected to the inverter.
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