POWER SUPPLY COMMON GROUNDING
Whether logic and digital outputs are powered together or separately; the DC common (“-“) connections on all
power supplies should be connected together. One of the power supplies should have its DC common connected
to ground. Avoid connecting more than one power supply DC common to ground because this can lead to
unintended grounding loops. Figure 14 and Figure 15 show single and separate power supply connections
respectively and their DC common connections and grounding connection.
FIGURE 14 – S I N G L E POWER SUPPLY CONNECTION WITH DC COMMONS TIED TOGETHER AND TO GR OUND
FIGURE 15 - D U A L POWER SUPPLY CONNECTION WITH DC COMMONS TIED TOGETHER AND TO G R O U N D
This document assumes the user is aware of power requirements for the application and
that the user and/or installer have properly sized 24VDC power supplies and wiring based
upon all applicable codes and standards. This document also assumes installation will
follow proper equipment grounding practices. “DC common or -”on all power supplies
should always be connected to ground. Improper power supply sizing and/or improper
grounding practices may produce unexpected results.
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