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150-409-115-05, Issue 5 Ground Faults
EDU-409 List 1 January 26, 2000 19
GROUND FAULTS
G
ROUND FAULT DETECTION
The EDU-409 List 1 has ground fault detection (GFD) circuits. When used
with HiGain line units, ground faults occurring at any point along any span
are immediately detected. Ground fault conditions shut the HiGain circuit
down. The line unit periodically tries to apply power to the first span to
determine whether the fault condition is still present. As long as the condition
exists, the power cycling and ground fault protection continues. To
discontinue the ground fault protection, locate and repair the fault in the
cable.
Circuits containing both the EDU-409 List 1 and older doublers without a
GFD circuit also support this new ground fault detecting feature, provided the
doubler nearest the ELU is an EDU-409 List 1.
The operation of the ground fault circuit requires that the
doubler enclosure ground plane is properly connected to
earth ground.