Control System Power and Grounding Better Practice by Roger Hope, Dave Harrold, David Brown

By Roger Hope, Dave Harrold, David Brown

Keep an eye on 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 lifestyles. the subject is acceptable to each keep an eye on method area, together with programmable common sense controllers, technique keep an eye on platforms, robotics, imaginative and prescient platforms, and so forth. chronic and grounding is well-known through a huge criteria association, ISA, in ongoing criteria efforts. keep watch over Engineering and several other energy and grounding specialists have built this keep watch over approach strength and grounding source. whilst utilized in conjunction with keep watch over approach producer deploy documentation, clients can anticipate powerful, trustworthy keep an eye on method install; one who is still freed from ''phantom'' difficulties brought on by strength and grounding system defects. - presents readability for manufacturer's vague procedure documentation - the one unmarried resource keep an eye on method strength and grounding consultant on hand. - info how you can considerably increase reliability on top of things structures, saving precious time and cash.

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Similarly, cards 3 and 4 must use the same voltage level, although the level can differ from that of cards 1 and 2. However, it is recommended to supply the same field voltage to all cards on the same carrier. Figure 3-5 illustrates typical connections for adjacent I/O cards. Figure 3-6 illustrates typical connections for extending power from power supplies used for adjacent I/O cards. 3-5 Connection for Two I/O Cards AC DC DC AC N Return Return N L Supply Supply L Figure 3-5 Bussed Field Power Wiring (Non-Extended Power) Connection for Two I/O Cards DC Connection for Adjacent I/O Cards AC DC AC N Return Return N L Supply Supply L Add Jumper Wires to Extend Power Figure 3-6 Note ...

However, it is recommended to supply the same field voltage to all cards on the same carrier. Figure 3-5 illustrates typical connections for adjacent I/O cards. Figure 3-6 illustrates typical connections for extending power from power supplies used for adjacent I/O cards. 3-5 Connection for Two I/O Cards AC DC DC AC N Return Return N L Supply Supply L Figure 3-5 Bussed Field Power Wiring (Non-Extended Power) Connection for Two I/O Cards DC Connection for Adjacent I/O Cards AC DC AC N Return Return N L Supply Supply L Add Jumper Wires to Extend Power Figure 3-6 Note ...

To minimize EMI introduced by sources external to your control system, you should take the following precautions: H Use fiber-optic cable as much as possible in network communications systems, especially between buildings. Fiber-optic cable provides optimum protection from EMI and nearby lightning strikes. H Route network cables as far away from EMI sources (large motors, generators, transformers, and so on) as practical. H To minimize electrically induced noise on millivolt signals from thermocouples, resistance temperature detectors (RTDs), strain gauges, and pH electrodes, use individually shielded, twisted-pair cables specified for these devices.

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