By Roger Hope, Dave Harrold, David Brown
Keep watch over method energy and grounding is in all probability the one most crucial aspect to make sure a regulate procedure does not adventure unidentified ''gremlins'' all through its lifestyles. the subject is acceptable to each keep watch over process area, together with programmable good judgment controllers, method regulate structures, robotics, imaginative and prescient structures, and so on. chronic and grounding is famous by means of an incredible criteria association, ISA, in ongoing criteria efforts. regulate Engineering and several other energy and grounding specialists have constructed this regulate process strength and grounding source. while utilized in conjunction with regulate method producer set up documentation, clients can count on powerful, trustworthy keep an eye on process install; person who is still freed from ''phantom'' difficulties brought on by strength and grounding system faults. - offers readability for manufacturer's vague approach documentation - the one unmarried resource keep watch over procedure strength and grounding consultant to be had. - info find out how to considerably enhance reliability on top of things platforms, saving important money and time.
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Only one input voltage is used; not both simultaneously. Figure 3-2 DC/DC Dual Power Supply Input Connections 3-3 Bussed Field Power Bussed field power is connected directly to the I/O interface carrier, as shown in Figure 3-3. For 24 VDC field devices, either bulk DC power supplies or DC plant power can be used. For 120 VAC or 240 VAC field devices, power from the AC power distribution system can be used. The AC distribution system used for bussed field power should not be the same one as used for the control system.
Table C-2 lists recommended wire sizes based on cable length. 5 mm) inch wide H Holes for lugs H Double-bolted lugs H Bus isolated from mounting bracket with standoffs 4-11 Isolated Mounting for Ground Bars Ground Bus Assembly Mounting Bracket (2) Grommet (2) 1 Note: 1 Isolate the assembly from the mounting bracket. 53) 4-12 DC Return Ground Wiring Ensure that DC return grounds are on separate wires from each power supply to the enclosure local ground reference point. The DC return ground connection at the power supply is the negative (–) DC terminal.
Figure 2-5 AC Distribution System Grounding 2-10 From Main Distribution Panel G N A B C 1 Circuit Breaker Panel A B C 2 2 2 2 Neutral Bus (Isolated from Breaker Panel) 1 Isolated Ground Receptacles Ground Bus (Isolated from Breaker Panel) Notes: 1 Conduit provides a safety ground connection for individual panels. If no conduit or non-metallic conduit is used, bond panels together with cable. See NEC table 250-122. 2 Circuit breaker as required by national codes and regulations. Figure 2-6 Single Circuit Breaker Panel Wiring for Isolated Ground Recept 2-11 AC Power Supply Connections It is recommended that AC power from a breaker be connected to a terminal block inside the enclosure, as illustrated in Figure 2-5.