Maintenance and Troubleshooting

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 5–7.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 5–3for more information.

Table 6-1is intended to assist in determining fault conditions that may require user action to remedy.

Table 6-1Troubleshooting the GT Inverter

ProblemPossible CauseSolution

 

 

 

The inverter’s LEDs and display are

Utility service panel AC and DC

Turn on the breakers in the sequence

blank and the inverter does not

breakers are switched off.

described in “Commissioning

operate in sufficient sunlight.

 

Procedure” on page 4–2.

 

 

 

The display reads “Inverter Offline”

Utility service panel breakers are

Turn on utility panel breakers.

and “AC Voltage Fault.”

switched off.

 

 

AC grid voltage is not present or

Check AC connections at the

 

incorrect.

inverter’s terminals. Ensure AC

 

 

voltage within the range specified in

 

 

“Output” on page A–2is present.

 

 

 

The display reads “Inverter Offline”

DC breakers are switched off (if

Turn on any DC breakers and check

with sufficient sunlight.

installed), or external DC fuses are

any DC fuses.

 

blown (if installed).

 

 

DC array voltage is not present.

Check DC connections at the

 

 

inverter’s positive and negative DC

 

 

terminals. Check for incorrectly

 

 

wired PV arrays.

 

 

 

The display reads “Inverter Offline”

DC voltage is present but incorrect.

Check DC connections at the

and “DC Voltage Fault” with

 

inverter’s positive and negative DC

sufficient sunlight.

 

terminals. Check for incorrectly

 

 

wired PV arrays. Ensure a voltage of

 

 

195–550 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 5–7.

6–4

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