Page 81
©
2017 Sensata Technologies
Maintenance and Troubleshooting
5.5 Removing/Replacing the GFDI Fuse
WARNING:
Dangerous voltages can exist inside the controller. Disconnect all PV and
battery circuits to the PT controller before removing or installing the GFDI fuse. The PT
controller has internal capacitors that remain charged after disconnecting all sources of
power. Wait at least 5 minutes for these capacitors to discharge before servicing the unit.
WARNING:
Performing service or maintenance on the controller can be life-threatening,
if done improperly. Service on the controller (including replacing fuses) must only be
performed by authorized personnel, these are quali
fi
ed electricians and technicians who
are familiar with PV system wiring and safety practices.
CAUTION:
For continued protection against risk of
fi
re, replace only with the same type
and rating of fuse.
The fuse used in the GFDI circuit opens when severe leakage occurs between a current-carrying
conductor in the PV system and an equipment grounding conductor or grounded surface/device.
Before replacing the fuse, it is important that the ground fault is located and corrected.
To remove and replace the GFDI fuse:
1. Remove the access cover (see Section 2.3.1).
2. Locate the GFDI fuse holder (see Figure 5-1).
3. Use an insulated standard
fl
at-blade screwdriver to remove and replace the GFDI fuse.
Info:
The fuseholder is spring-loaded, so it will need to be pushed in before turning.
Push-in and turn the cap on the fuseholder Counter Clock-Wise (CCW) to open/remove
the cap and Clock-Wise (CW) to close/replace the cap (see Figure 5-1).
Info:
The GFDI fuse is a 0.5 amp/300-volt DC rated fuse in a 5x20mm case made by
Schurter Inc. It can be purchased from Digi-Key (www.digikey.com), the Digi-Key Part
Number is 0001.2501-ND.
4. After the fuse has been replaced, reattach the access cover.
Figure 5-1, GFDI Fuse Location (Access Cover Removed)
Inside wiring compartment view, under access cover.
GFDI
fuseholder
The fuseholder is
spring-loaded.
Push in prior to
turning.
CLOSE/RESTORE
(CW)
OPEN/REMOVE
(CCW)