Maintenance and Troubleshooting
6–4975-0131-01-01
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 determine the cause of the ground fault.
To replace a ground fault protection fuse:
1. Remove the wiring box and front panel covers (described on page2–23 and
page 3–2). The ground fault protection fuse is located on the left side of the
LCD panel, behind the front panel cove r (Figure 6-1).
2. 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).
3. Replace the front panel and wiring box covers (described on page 2–23 and
page 4–3).
WARNING: Shock and fire hazard
Fuses should only be replaced by qualified service personnel. 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 circuit s connected to
the inverter. Internal capacitors remain charged for five minutes after disconnecting all
sources of power.
WARNING: Shock hazard
Dangerous voltages can ex ist inside the inverter. If there is leakage curr ent from the
POSITIVE PV lead to ground at the array, touching t he NEGATIVE PV lead could cause
a life-threatening shock even with the disc onnect switch turned off. Ungrounded negative
DC current on the PV NEGATIVE (–) wire presents an extreme shock hazard.
When the fuse has blown due to a fault, in correct handling can be life-threatening. Use an
insulated fuse puller.
If possible, cover PV arrays with an opaque material during this procedure.