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Maintenance and Troubleshooting
6–4 975-0320-01-01
Replacing the Ground Fault Protection Fuse
The ground fault protection fuse will blow when severe leakage occurs between
the PV array and earth ground, or when the system has been installed with faulty
wiring. Before replacing the fuse, it is important to have qualified service
personnel, such as a certified electrician or technician, determine the cause of the
ground fault.
To replace a ground fault protection fuse:
1. Remove the wiring/disconnect box cover, as described on page 3–5.
2. Remove the display front panel cover (see Figure 6-2), located below the heat
sink. Use a Phillips screwdriver to remove the two external panhead screws
and washers and the two screws along the bottom edge of the cover.
The ground fault protection fuse is located to the left side of the LCD panel
(see Figure 6-1), and to the left of the DC interconnect board for positive
grounded units (marked with the “-POS” suffix).
3. Using an insulated fuse puller, remove the blown fuse and replace it with a
new AC/DC midget cartridge, rated 600 Vdc, 1A (Littelfuse KLKD 1 or
equivalent).
4. Replace the display front panel cover and tighten all four screws securely.
5. Replace the wiring/disconnect box cover.
WARNING: Shock and fire hazard
Fuses should only be replaced by qualified service personnel, such as a certified
electrician or technician. For continued protection against risk of fire, replace only with
same type and ratings of fuse.
WARNING: Shock hazard
After disconnecting both AC and DC power from the GT Inverter, wait five minutes
before attempting any maintenance or cleaning or working on any circuits connected to
the inverter. Internal capacitors remain charged for five minutes after disconnecting all
sources of power.
WARNING: Shock hazard
• Dangerous voltages can exist inside the inverter. If there is leakage current from the
ungrounded conductor to ground at the array, touching the grounded lead could cause a
life-threatening shock even with the disconnect switch turned off. Ungrounded DC
current within the inverter presents an extreme shock hazard.
• Cover PV arrays with an opaque material during this procedure.
• When the fuse has blown due to a fault, incorrect handling can be life-threatening. Use
an insulated fuse puller.