Technical information

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3. A less likely cause is limited to multiple inverter installations, when
the positive and negative array strings are crossed. Crossed wires occur
when a positive or negative conductor from array 1 is connected with
wires in array 2. An example is if inverter A has the positive conductor
from array 1 and the negative conductor from array 2 connected.
4. If the fuse is open, then a ground fault condition exists.
• Check the DC voltage between the grounded terminal of the array
and earth ground.
• The voltage should be less than 25 VDC with the GFI fuse re-
moved. If the voltage is greater than this, check the array wiring as
there may be a ground fault. For the best results, perform this test
with the disconnect on and off. If you are not comfortable conduct-
ing this test, DO NOT ATTEMPT IT. (See Chapter 7, Service and
Replacement on page 39).
• If a ground fault condition is not present because it is now re-
paired or intermittent, replace the fuse with a similar fuse rated at
600VDC and 1A.
Note: ReplacetheGFIfusewiththesametypeandratingof
fuse.TheinverterusesLittlefuseKLKD11A/600VDC.
5. Make sure the grounded leg of the PV array is not broken in the
disconnect.
NOTE: TheGFIisalatchingcircuitwhichpreventstheinverterfrom
operatinguntilthefaultisrepairedandtheinverterisreset.
Theinverterwillnotoperate,evenifthefaultisrepaired,
unlessitismanuallyresetbyturningthedisconnectoffand
thenon.
6.2 Displayed Fault Codes
The vacuum uorescent display (VFD) provides the codes shown in
Figure 6-1 and Figure 6-2 when a fault has occurred.
Screen 1 Screen 2 Screen 3
Figure 6-1 Faulted