By Roger Hope, Dave Harrold, David Brown
Regulate process strength and grounding is in all likelihood the one most crucial point to make sure a regulate approach does not adventure unidentified ''gremlins'' all through its existence. the subject is suitable to each regulate method area, together with programmable common sense controllers, strategy regulate structures, robotics, imaginative and prescient structures, and so forth. chronic and grounding is well-known by way of a huge criteria association, ISA, in ongoing criteria efforts. keep watch over Engineering and a number of other strength and grounding specialists have built this keep watch over process strength and grounding source. whilst utilized in conjunction with keep an eye on method producer deploy documentation, clients can count on powerful, trustworthy keep an eye on approach deploy; person who is still freed from ''phantom'' difficulties as a result of strength and grounding system defects. - offers readability for manufacturer's imprecise procedure documentation - the single unmarried resource keep watch over approach energy and grounding consultant on hand. - information easy methods to considerably increase reliability up to the mark structures, saving important time and cash.
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Extra info for Control System Power and Grounding Better Practice
Figure 2-9 shows line, neutral, and ground connections for multiple, grouped, bulk power supplies. AC to DC Controller and I/O Power Supply From AC Power Distribution Ground (G) Neutral (N) Line (L) Figure 2-7 AC to DC Controller and I/O Power Supply Input Connections 2-12 Isolation Transformer L N Distribution Panel G L Bulk AC to 12 or 24 VDC Power Supply N G AC to DC L N G 1 DC Return Ground 12 VDC or 24 VDC 12 VDC or 24 VDC Return (–) 2 AC Ground Isolated Local Ground Reference 2 DC and Enclosure Ground Control System Ground (CSG) Grounded Steel Column Dedicated Plant Ground Grid Notes: 1 Power supply chassis is grounded through the mounting enclosure.
Refer to Chapter 7 for information about soils and earth grounds. Testing an earth ground per the procedure described in Chapter 7 is highly recommended. 4-13 Shield Grounds Proper field-wiring shield grounds help ensure proper system operation by reducing electromagnetic interference in signal wiring. A proper shield ground path is to ground the shield at one end only. Grounding at both ends can cause ground loops. The preferred end is at the carrier shield bar. If field transmitters or final control elements are well-grounded four-wire units, shield wires can be grounded to the units instead of the carrier shield bar.
Figure 4-14 shows typical grounding requirements for a control system using an intrinsically safe (IS) I/O system. The shield bar is connected to the enclosure frame. The carrier is connected to either an isolated local reference point or the isolated common reference point (shown). These grounds provide the electrical ground required for the I/O cards and the IS power supply. Power leads to the supply are connected from a 24 VDC bulk power supply. The negative (–) output terminal is grounded at the bulk power supply output (as shown in Figure 4-11).