Alpha OutBack Power Radian Series Operator's Manual page 48

Troubleshooting
Symptom Possible Cause
Unusual voltage System neutral and ground
on hot or neutral may not be bonded.
output line.
Input neutral is not connected
Unusual and
correctly. The inverter also
different voltages
may not connect to the AC
on AC hot input
source. Loads may behave
lines.
unusually.
Inverter has not synchronized
with input source.
Erratic AC source voltage.
Inverter set to Search
(Search mode).
Loads drop out or
crash during
transfer.
Loads sensitive to inverter's
transfer time. UPS mode not
in use on the appropriate
input.
Loads too large.
Undersized battery cables.
48
Table 5 Troubleshooting
Possible Remedy
Test L1 O
UT
voltmeter. (See page 45.) 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.)
Test L1 input and neutral connections with AC voltmeter.
Test L2 input and neutral connections with AC voltmeter.
(This can be on G
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.
System display only: The AC In reading accessed by the
<Inverter> soft key may be erratic or inaccurate after initial
connection until the inverter has synchronized with the AC
source. This may require a short time.
Check AC voltage on the inverter's input test points. (See
page 45.) If not consistent, the problem is external.
System display only: AC source voltage may have dipped or
hovered at a low enough point to crash a sensitive load
before the inverter could take over. This can happen if the
inverter's Grid AC Input Voltage Limits or Gen AC Input
Voltage Limits were turned down to accommodate a
problematic AC source. To make the inverter respond
sooner, raise the lower limit setting in the appropriate menu.
(If this setting was intentional, then no action is required.)
The unit will take a moment to come out of Search mode after
transferring.
System display only: If constant power is required, set to ON
with the INVERTER hot key. (If this setting was intentional,
then no action is required.)
System display only: Most of the input modes feature a small
but noticeable response time during transfer. Certain loads
(such as highly sensitive computers) may not respond well.
The UPS mode has a faster response time. Select this mode
for the appropriate input. (See page 16.)
The unit can transfer more power than it can invert. If loads
are oversized, the unit will falter or crash when switching to
batteries. Reduce the size of the loads.
Battery cables smaller than recommended will cause a
significant voltage drop when switching to batteries, acting
like either an overload or a low-battery condition. Size all
cables correctly.
, L2 O , and N O test points with AC
UT UT
or G input, depending on where the
RID EN
900-0161-01-01 Rev B