Identifying Error/Fault Conditions and Solutions
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6–9
Identifying Error/Fault Conditions and Solutions
Most error or fault conditions will be identified by fault message screens on the
GT Inverter front panel LCD. These are described in the “Fault Mode” section on
page 5–8 of this manual. Most of these fault conditions are self-correcting and
require no user action to remedy.
See “Front Panel Display Screens and What They Mean” on page 5–2 for more
information.
Table 6-1 is intended to assist in determining fault conditions that may require
user action to remedy.
Table 6-1
Troubleshooting the GT Inverter
Problem
Possible Cause
Solution
The inverter’s LEDs and display are
blank and the inverter does not
operate in sufficient sunlight.
DC/AC Disconnect Switch is off.
Turn on DC/AC Disconnect Switch
and breakers in the sequence
described in “Startup Procedure” on
page 4–1.
The display reads “Inverter Offline”
and “AC Voltage Fault.”
Utility service panel breakers are
switched off.
AC grid voltage is not present or
incorrect.
Turn on utility panel breakers.
Check AC connections at the
inverter’s terminals. Ensure AC
voltage within the range specified in
“Output” on page A–2 is present.
The display reads “Inverter Offline”
with sufficient sunlight.
DC breakers are switched off (if
installed), or external DC fuses are
blown (if installed).
DC array voltage is not present.
Turn on any DC breakers and check
any DC fuses.
Check DC connections at the
inverter’s positive and negative DC
terminals. Check for incorrectly
wired PV arrays.
The display reads “Inverter Offline”
and “DC Voltage Fault” with
sufficient sunlight.
DC voltage is present but incorrect.
Check DC connections at the
inverter’s positive and negative DC
terminals. Check for incorrectly
wired PV arrays. Ensure a voltage
between 240 and 550 Vdc is present
at the inverter’s terminals.
Only the inverter RED LED is
illuminated and the display reads
“Ground Fault.”
Ground fault condition detected on
the PV array.
The PV system should be checked
by a qualified electrician and
repaired. See Table 5-8 on page 5–8.
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