Energy, Power

Energy, Power January 1, 1998

The Benefits of Personal Computer-BasedControl Systems

PCs have become more useful as part of open architecture control systems.

By Dave Gee, Steeplechase Software
Energy, Power January 1, 1998

SCADA Systems ‘Dampen’ Infrastructure Problems

The southern tip of California's Marin county is separated from the city of San Francisco by the most famous mile-long strip of steel and concrete in the world. Yet, within a 10-minute walk of the Golden Gate's Marin terminus begins a county-wide network of California Wildlife Service signs warning against mountain lion attacks.

By Jon Mandell and Bob Cook, Marin Muncipal Water District; Brenda Riconscente, Cal Tech Controls; Read Hayward, DST Controls
Energy, Power January 1, 1998

Connect to the Benefits of Digital Industrial Networks

More users, system integrators, and manufacturers of control hardware and software are realizing the benefits of digital networks at the sensor, device, and fieldbus levels.In this kickoff of the "Year of the Network" series, Control Engineering asked leaders associated with 12 major industrial networks to reveal growth projections, ideal applications, views on standards, and future out...

By Mark T. Hoske, Control Engineering
Energy, Power January 1, 1998

Road to Engineer’s License is Both Difficult and Worthwhile

Many professions involve some certification procedure whereby practitioners can demonstrate competency. For lawyers, it's the bar exam. For accountants, it's the CPA. For engineers, it's the P.E.—the Professional Engineer's license.A P.E. license entitles practitioners to advertise themselves as "engineers" and offer engineering services to the public.

By Vance J. VanDoren, P.E.
Energy, Power January 1, 1998

Advanced Control Software Goes Beyond PID

PID loops control a majority of the automated processes in industrial facilities. The proportional-integral-derivative (PID) algorithm is both simple and reliable, and has been applied to hundreds of thousands of control loops over the last 50 years.However, not all industrial processes can be controlled with PID loops.

By Vance J. VanDoren, Control Engineering
Energy, Power August 1, 1997

Ground Loops and Their Cures

The National Electrical Code (NEC) defines a ground as ‘a conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.’ A ground loop can be defined as any objectionable current flowing in a circuit’s ground or return path. Here is a short guide that will help identify possible sources of ground loops in your electrical systems and how to solve them. The simplest ground loop involves connection between two different earth grounds as shown in the top figure. With earth ground #1 at one potential, and earth ground #2 at a different potential, a ground loop current will flow in the loop as indicated.

By William L. Mostia, Jr. PE, Amoco Chemicals
Energy, Power July 1, 1997

Intrinsic safety protects your plant against explosions

Explosions can be prevented by limiting the amount of electrical energy available in hazardous areas or by containing the situation using bulky, heavy devices called ‘explosion-proof enclosures.’ Limiting excess electrical parameters such as voltage and amperage (current) requires the use of energy-limiting devices known as ‘intrinsically safe (IS) barriers.’ Explosion-proof enclosures prevent or control explosive situations with brute force. They are heavy containers designed to hold an explosion inside. Electrical devices within explosion-proof enclosures can operate at normal power levels.

By Henry M. Morris
Energy, Power May 1, 1997

AS-i bus cuts cycle time in half for cleaning equipment manufacturer

BUS OF THE MONTH: AS-i Bus

By Control Engineering Staff
Energy, Power April 1, 1997

Simplicity and low cost attract users to Seriplex

Bus of the month

By Control Engineering Staff
Energy, Power March 1, 1997

Profibus Provides Fast, Reliable Communications for Coal Mining

BUS OF THE MONTH: Profibus-DP

By Control Engineering Staff