Xantrex XPD 120-4.5 Operating Manual page 46

Section 3. Local Operation
Using Multiple Supplies
Positive-negative supply To obtain a positive-negative supply, connect the
negative output terminal of one supply to the positive terminal of the second supply.
The positive output terminal of the first supply now provides a positive voltage
relative to the common connection. The negative output terminal of the second
supply provides the negative voltage. The current limits can be set independently of
each other. The maximum current available in split operation is equal to the rated
output of the supplies.
Figure 3.5 Split Supply Operation of Multiple Supplies (Positive-negative Supply)
Note
slave unit. In this arrangement, one-knob control of both supplies is possible
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Postive Sense
Positive Output
Terminal
Negative Output
Terminal
Return Sense
Power Supply 1
Postive Sense
Positive Output
Terminal
Negative Output
Terminal
Return Sense
Power Supply 2
Split supply operation requires the use of an isolated analog interface card on the
Load Lines
Use the largest gauge and
shortest length possible
Positive Load
Terminal
Common Load
Terminal
Negative Load
Terminal
Load
Operating Manual for XPD Series Power Supply