Panel redesign: Switching from ac to dc controls

Those involved in control systems design may remember when dc power was no where to be found in a control panel. If you're considering a switch from ac to dc, here are some considerations.

07/03/2008


St. Charles, IL – Those involved in control systems design may remember when dc power was no where to be found in a control panel; most ac controls operated on 120 V ac, which was provided by a control power transformer (CPT) converting primarily 480 V ac to 120 V ac, according Puls Power Supplies in newsletter available on its site. If you're considering a switch from ac to dc, here are some considerations.

Puls ML100.200


- As power demands have increased throughout the world, certain problems have been encountered in the control panel due to ac power surges and brown outs. Fluctuations on the extreme high or low side can cause a control power transformer to produce unwanted voltages on the secondary side, affecting the operation of the applications.
- Safety measures have also been increased by many agencies for the protection of personnel and equipment. These changes make ac controls not as straight forward to install as in years past because of the need of additional protective devices.
- Because of these ac power and safety issues , many design engineers are switching to dc components in the control panel; dc power supplies can offer better output regulation over a wider ac input range than a transformer can.
Puls explains what questions to explore when contemplating the change from ac to dc controls. Read more in “The PULS Advantage, Issue 6: ML100.200 - The Perfect Solution when Changing from AC to DC Control (PDF 524 kB).”
Converting? Puls ML100.200 converts the ac voltage of a typical 3-phase system into a regulated dc voltage,
For more help in this area, Control Engineering cover story:

Electrical Design Software

.

– Edited by  Mark T. Hoske , editor in chief
Control Engineering System Integration eNewsletter
Register here and scroll down to select your choice of eNewsletters free .





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Save energy with automation; Process control system upgrades; Dispelling controll myths; Time-sensitive networking; Control system integration; Road to IANA
Additive manufacturing advancements; Machine vision enhances robotics; Fieldbus evolution; Process safety; Advice from System Integrators of the Year; Road to IANA
Salary and career survey: Benchmarks and advice; Designing controls; Remote data collection, historians; Control valve advances; Hannover Messe; Control Engineering International
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
click me