Power supply considerations: Size, application, environment

Are power quality and reliability among your concerns? Are you working on a power supply retrofit project? Here are considerations, large and small, for sizing, application, and integration, to ensure minimum project disruption. A power supply system can include: Signaling module, dc power supplies, redundancy module, dc uninterruptible power supply (UPS), battery backup, and electronic diagno...

05/01/2009


7 additional power-related articles

From Control Engineering and other resources.

Are power quality and reliability among your concerns? Are you working on a power supply retrofit project? Here are considerations, large and small, for sizing, application, and integration, to ensure minimum project disruption.

Fluke 289 Industrial Trending Digital Multimeter has useful features like ghost voltage detection, filters for variable-frequency drive output readings, and record/save ability for V ac, V dc, Ohms, capacitance, A ac and A dc.

Fluke 289 Industrial Trending Digital Multimeter has useful features like ghost voltage detection, filters for variable-frequency drive output readings, and record/save ability for V ac, V dc, Ohms, capacitance, A ac and A dc.

A power supply system can include: Signaling module, dc power supplies, redundancy module, dc uninterruptible power supply (UPS), battery backup, and electronic diagnostic module.

Beyond just a power supply, systems now provide integrated components. Previously, the end-user, machine builder, or system integrator had to make separate elements work together. Also now commonly included are multi-color LEDs for diagnostics, relay contacts for alarming or reporting signals to higher-level controls, and power security components.

“In the past customers had to come up with their own solutions or risk downtime or maintenance issues. Vendors provided 24 V power supplies and that was it,” says Kai Bronzel, product manager for product supplies, Siemens Energy & Automation Inc. Now automation suppliers can provide everything, avoiding any consideration of office-grade UPSs for critical plant-floor applications, Bronzel says.

As for sizing power supplies, Rockwell Automation advises: 1) Determine the “average” continuous current of the load and the typical inrush current, and 2) Select a power supply where the rated load is at/or below the current of the device and the peak current is less than the short-circuit rating of the power supply.

Supply, diagnostics, and backkup modules are in the Sitop DC Power Security System with DC UPS and Battery Backup from Siemens Energy & Automation Inc.

Supply, diagnostics, and backkup modules are in the Sitop DC Power Security System with DC UPS and Battery Backup from Siemens Energy & Automation Inc.

Power supply failures can be big and small. Even with 24 V protection on a line, 3-phase power coming into the building can disrupt operations. To avoid this, know where troubles originate, and what they can cost before making an investment. Energy assessments, before and after outages, can justify investments in energy saving and other electrical devices.

At Fluke’s site online, see the document, “Power Quality Troubleshooting” for detailed advice on power supply failure issues. Fluke also advises the following:

  • Know the cost of downtime: Quantify the cost attributed to power loss or power quality to help justify any project;

  • Troubleshooting, diagnostics: Handheld tools with on-screen diagnostics can help get your operation back online quickly;

  • Predictive maintenance: Detect and prevent power quality issues before downtime happens;

  • Quality of service: Check incoming power quality at the main and remember that 75% of power quality problems originate with wiring and grounding (Ask yourself: How’s your isolation?);

  • Long-term analysis: Find intermittent power issues and map the location, keeping all related records; and

  • Load studies: Before adding loads, verify electrical system capacity.

Mark T. Hoske, MHoske@cfemedia.com , editor in chief, Control Engineering.



7 additional power-related articles from
Control Engineering and others

ONLINE extra
- Ground Loops ;
- See the unseen: Power data diagnostics ;
- Power Quality Troubleshooting PDF from Fluke ;
- Fluke 289 True-rms Industrial Logging Multimeter with TrendCapture ;
- Balluff calculator determines power supply size ;
- Carlo Gavazzi interactive Power Supply Selection Guide ; and
- Sizing a power supply, from Rockwell Automation .





No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Strategic outsourcing delivers efficiency; Sleeve bearing clearance; Causes of water hammer; Improve air quality; Maintenance safety; GAMS preview
World-class maintenance: The three keys to success - Deploy people, process and technology; 2016 Lubrication Guide; Why hydraulic systems get hot
Your leaks start here: Take a disciplined approach with your hydraulic system; U.S. presence at Hannover Messe a rousing success
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
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
Applying network redundancy; Overcoming loop tuning challenges; PID control and networks
Putting COPS into context; Designing medium-voltage electrical systems; Planning and designing resilient, efficient data centers; The nine steps of designing generator fuel systems
Package boilers; Natural gas infrared heating; Thermal treasure; Standby generation; Natural gas supports green efforts

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me