ADC EDU-409 GROUND FAULTS, GROUND FAULT DETECTION

150-409-115-05, Issue 5 Ground Faults

GROUND FAULTS

GROUND 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.

EDU-409 List 1 January 26, 2000 19