ADC EDU-409 Manuel D’Utilisation

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.