DSE Model 8620 AMF Controller Operators Manual
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4.3.8 3 PHASE 4 WIRE WITH UNRESTRICTED EARTH FAULT MEASURING
NOTE:- Unrestricted Earth Fault Protection detects earth faults in the load and in the
generator. Be sure to measure the natural earth fault of the site before deciding upon an earth
fault alarm trip level.
4.3.9 EARTH SYSTEMS
4.3.9.1 Negative Earth
The typical wiring diagrams located within this document show connections for a negative earth system
(the battery negative connects to Earth)
4.3.9.2 Positive Earth
When using a DSE module with a Positive Earth System (the battery positive connects to Earth), the
following points must be followed:
• Follow the typical wiring diagram as normal for all sections EXCEPT the earth points
• All points shown as Earth on the typical wiring diagram should connect to BATTERY
NEGATIVE (not earth).
4.3.9.3 Floating earth
Where neither the battery positive nor battery negative terminals are connected to earth the following
points must to be followed
• Follow the typical wiring diagram as normal for all sections EXCEPT the earth points
• All points shown as Earth on the typical wiring diagram should connect to BATTERY
NEGATIVE (not earth).
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