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Ground Fault Protection
Ground fault protection is required when using either solar or wind
renewable energy input. Figure 3-1 shows the location of the ground fault
protection terminals and replaceable fuse.
When a grounding fault is detected, the ground fault protection fuse will
blow. The system must be shut down completely, the fault corrected, the
fuse replaced (see “Replacing the Ground Fault Protection Fuse”) and
then the system restarted.
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 DC wiring. Before replacing the fuse, it is important
to have qualified service personnel, such as a certified electrician or
technician, to determine the cause of the ground fault.
To replace the ground fault protection fuse:
1. Remove the five Phillips screws on the top of the inverter and lift off
the panel to expose the terminals, as shown in Figure 3-1.
2. Locate the PV ground fault protection fuse.
3. Using a slot blade screwdriver, remove the blown fuse and replace it
with a new Littelfuse 5mm×20mm fuse rated 1A 250 Vac slow blow
(or equivalent).
WARNING: Shock hazard
Troubleshooting a grounding fault should be performed by qualified personnel,
such as a certified electrician or technician.
WARNING: Energy and fire hazard
For continued protection against risk of fire, replace the ground fault protection
fuse only with the same type and ratings of fuse.
WARNING: Shock hazard
After disconnection both AC and DC power for the the system, 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.