Installation
Sorensen DCS Series 3kW Supplies
2.7
2.7.1
Load
Connection
This section provides recommendations for load wiring and connecting as they apply to both
single and multiple load configurations.
Load
Wiring
When connecting load wiring to the power supply, you must consider the following factors:
•
the current carrying capacity of the wire,
•
the maximum load wiring length for operation with sense lines, and
•
noise and impedance effects of the load lines.
Current Carrying Capacity
As a minimum, load wiring must have a current capacity greater than the output current rating of
the power supply. This ensures that the wiring will not be damaged even if the load is shorted.
The table below shows the maximum current rating, based on 450 amps per square centimeter,
for various gauges of wire rated for 105 degrees C operation. Operation at the maximum current
rating results in approximately a 30-degree temperature rise for a wire operating in free air.
Where load wiring must operate in areas with elevated ambient temperatures or bundled with
other wiring, larger gauges or higher temperature-rated wiring should be used.
AWG Maximum
Current AWG Maximum
Current
16
7
4
106
14
11
2
170
12
18
1
209
10
23
1/0
270
8
39
2/0
330
6
67
3/0
350
Load Wiring Length for Operation with Sense Lines
For applications using remote sensing, the voltage drop across each load line must be limited to
1V or less.
shows the maximum allowable wire length that may be used for a given
load current and wire size to ensure that this limit is not exceeded.
2-10
Operation Manual
