3. Check for continuity (ohms). It should be zero or 1-2 ohms. If the meter indicates no
continuity, then a ground fault likely exists.
4. If the fuse is blown, replace it with a like fuse rated at 600VDC and 1A. DO NOT
insert the new fuse until there is no ground fault present.
5. Check the DC voltage between the grounded terminal of the array and earth ground.
The voltage should be less than 25 volts with the GFI fuse removed. If the voltage is
higher than that, check the array wiring (there may be a ground fault). For the best
results, perform this test with the DC disconnect ON and OFF. If you are not com-
fortable conducting this test, DO NOT ATTEMPT IT.
6. Make sure the grounded leg of the PV array is not broken in the DC disconnect.
5.3 Displayed Fault Codes
The vacuum fluorescent display (VFD) provides the codes shown in Figures 5-1 and 5-2
when a fault has occurred.
Fault 1000 0400
AC Voltage High
Screen 1
0 Watts
1400 kWh
Screen 2
267 VAC
300 VDC
Screen 3
Figure 5-1 Faulted
PVP 3500
Start in 269 sec
Screen 1
Fault 1000 0400
AC Voltage High
Screen 2
0 W
1400 kW-hr
Screen 3
240 VAC
300 VDC
Screen 4
Figure 5-2 Starting Up From a Faulted State
22
Summary of Contents for 1100
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