Resolving Grounding Issues With Switch-Mode Power Supplies - As the plant landscape evolves, the rules are changing

摘要

Today, 80% of all input/ output (I/O) devices in automation applications are supplied with 24VDC power. The second most popular voltage is 120YAC, which is used on 15% of all I/Os. Over the past decade, the industry has seen a transition of power supply development from linear regulated designs to primary switch-mode (nonlinear) designs, and the corresponding installation and grounding requirements for the switch-mode power supply are worthy of review.