Installation
52
4.4 EARTH SYSTEMS
4.4.1 NEGATIVE EARTH
The typical wiring diagrams located within this document show connections for a negative earth
system (the battery negative connects to Earth)
4.4.2 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).
4.4.3 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).
4.5 TYPICAL ARRANGEMENT OF DSENET®
Twenty (20) devices can be connected to the DSENet®, made up of the following devices :
Device Max Number
Supported
DSE2130 Input Expansion 4
DSE2131 Ratio-metric Input Expansion 4
DSE2133 RTD/Thermocouple Intput
Expansion
4
DSE2152 Ratio-metric Output Expansion 4
DSE2157 Relay Output Expansion 10
DSE2548 LED Expansion 10
For part numbers of the expansion modules and their documentation, see section entitled DSENet
Expansion Modules elsewhere in this manual.
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