SORENSEN DCS SERIES MANUAL INSTALLATION and OPERATION
2-7
2.6 Standard Operation
Reliable performance of the DCS power supply can be obtained if certain basic precautions are taken when
connecting it for use on the lab bench or installing it in a system.
To obtain a stable, low noise output, careful attention should be paid to factors such as conductor ratings, system
grounding techniques and the way in which the load and remote sensing connections are made.
2.6.1 Load Conductor Ratings
The table below lists the maximum allowable load wiring length (in feet) for a specified wire gauge and power
supply model operating at full rated output. The lengths indicated are based on PVC insulated wire with a
maximum operating temperature of 105 degrees C. To overcome impedance and coupling effects which can
degrade the power supply performance the use of leads of the largest gauge and shortest length possible is
recommended.
WIRE SIZE (AWG)
MODEL 2 4 6 8 10 12 14 16 18
8-125 19 12 - - - - - - -
20-50 30 30 30 23 - - - - -
33-33 30 30 30 30 22 14 - - -
40-25 30 30 30 30 30 18 - - -
50-20 30 30 30 30 30 23 13 - -
60-18 30 30 30 30 30 26 16 10 -
80-13 30 30 30 30 30 30 22 20 -
150-7 30 30 30 30 30 30 28 26 -
300-3.5 30 30 30 30 30 30 30 30 -
600-1.7 30 30 30 30 30 30 30 30 30
2.6.2 Load Connection and Grounding
Proper connection of distributed loads is an important aspect of power supply application. A common mistake is to
connect leads from the power supply to one load, from that load to the next load, and so on for each load in the
system. In this parallel power distribution method, the voltage at each load depends on the current drawn by the
other loads and DC ground loops are developed. Except for low current applications, this method should not be
used.
The preferred way to distribute power is by the radial distribution method in which power is connected to each
load individually from a single pair of terminals designated as the positive and negative distribution terminals.
The pair of terminals may be the power supply output terminals, the terminals of one of the loads or a distinct set
of terminals specially established for distribution. Connecting the sense leads to these terminals will compensate
for losses and minimize the effect of one load upon another.
2.6.3 Inductive Loads
To prevent damage to the power supply from inductive kickback, connect a diode rated at greater than or equal to
the supply’s output voltage and current across the output. Connect the cathode to the positive output and the anode
to return. Where positive load transients such as back EMF from a motor may occur, connect a transorb or a
varistor across the output to protect the power supply.
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