Troubleshooting
60
900-0167-01-00 Rev A
Table 7
Troubleshooting
Symptom
Possible Cause
Possible Remedy
Inverter does not
perform the Offset
function when
expected.
Incorrect input mode.
Offset does not function in
Generator
,
UPS
, and
Backup
modes.
Specific mode only offsets
under particular conditions.
Support
mode will perform the Support function based on load.
This may appear as Offset without reaching the reference voltage.
GridZero
mode will perform Offset based on the
DoD Volts
setting. Other reference voltages are not used.
Unusual voltage on
hot or neutral output
line.
System neutral and ground may
not be bonded.
Test
AC HOT OUT
and
AC NEUTRAL OUT
terminals with AC
voltmeter. (See page 57.) 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 to75 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.
Inverter has not synchronized
with input source.
MATE3 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.
Loads drop out or
crash during transfer.
Erratic AC source voltage.
Check AC voltage on the
AC HOT IN
and
AC NEUTRAL IN
terminals. (See page 57.) If not consistent, the problem is external.
MATE3 system display only:
AC source voltage may have dipped to 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.)
Inverter set to
Search
(Search
mode).
The unit will take a moment to come out of Search after transfer.
MATE3 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.)
Loads sensitive to inverter’s
transfer time.
UPS
mode not
in use.
MATE3 system display only:
Most of the inverter’s input modes
feature a small but noticeable response time during transfer.
Certain loads (such as highly sensitive computers) may not respond
well. The
UPS
input mode has a faster response time. (See page 21.)
Loads too large.
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.
Undersized battery cables.
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.
Unit reads AC input,
even though no
source is present.
Internal transfer relay may be
damaged. May be
accompanied by
AC Relay Fault
error and shutdown.
Disconnect AC input wires and turn inverter on. Test the
AC HOT
OUT
and
AC NEUTRAL OUT
terminals with an AC voltmeter. (See
page 57.) If voltage appears there, the transfer relay may be
jammed. Contact OutBack Technical Support.
9
False reading due to noise.
Electrical noise can cause false readings on the metering circuits
when no voltage is present. The readings are usually less than
30 Vac. If this is the case, no action is required.
9
See inside front cover of this manual.
