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Replacing the Ground Fault Protection Fuse
975-0400-01-01
5–3
Replacing the Ground Fault Protection Fuse
The ground fault protection fuse blows 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 the ground fault protection fuse:
1. Remove the wiring compartment cover, as described on page 2–5.
The ground fault protection fuse is located behind the wiring terminals.
2. Remove the blown fuse and replace it with a new AC/DC midget cartridge,
rated 600 Vdc, 1A (Littelfuse KLKD 1 or equivalent). Be careful not to
damage the fuse clips, circuit board and surrounding components.
3. Replace the wiring compartment cover.
The LCD shows “Ground
Fault” and the unit has
stopped operating.
A ground fault has caused
the ground fault protection
(GFP) fuse to blow. A
severe leakage between the
PV array and earth ground
has occurred.
See “Replacing the Ground
Fault Protection Fuse”.
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 power from the XW SCC, wait four minutes before attempting any
maintenance or cleaning or working on any circuits connected to the unit. Internal
capacitors remain charged for four minutes after disconnecting all sources of power.
WARNING: Shock hazard
•
Dangerous voltages can exist inside the XW SCC. If there is leakage current from the
ungrounded conductor to ground at the array, touching the grounded lead could cause a
life-threatening shock.
•
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
insulated tools.
Table 5-1
PV Charge Control Problems
Problem
Possible Cause
Solution
Summary of Contents for XW-MPPT60-150
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