Variable frequency drives, inverters for open, closed loop control

Hitachi America Ltd. Industrial Components and Equipment Division, among offerings at Pack Expo Las Vegas 2011, showed the L700 Series of Industrial ac variable frequency drives and inverters.

10/04/2011


Hitachi America Ltd. Industrial Components and Equipment Division, offers the expanded L700 Series of Industrial ac variable frequency drives. Courtesy: HitachiHitachi America Ltd. Industrial Components and Equipment Division, among offerings at Pack Expo Las Vegas 2011, showed the L700 Series of Industrial ac variable frequency drives, said to expand significantly on performance, capabilities, and functions of the L300P. Hitachi improved the sensorless vector (SLV) control algorithm, allowing the drive to develop 150% torque at 0.5 Hz, said to be ideal for applications beyond fans and pumps. Hitachi EzSQ (Easy Sequence) built-in programming provides PLC functionality in an inverter, often eliminating need for a separate PLC in many applications. Programming is developed on a  PC then downloaded to the inverter, using the EzSQ software provided at no charge.

Hitachi SJ700-2200HFU2 model inverter, with a 440 A output current capability, which fills in the gap at 300-350 hp in the SJ700 series. The line covers the range from ½ to 600 hp. SJ700 expanded on the performance, capabilities and functions of its predecessor, the SJ300. The open-loop SJ700 (SLV) develops more than 200% starting torque at 0.3 Hz. Using Hitachi’s unique “0 Hz Domain” open-loop control mode, the SJ700 can develop 150% torque near 0 Hz, ideal for vertical lift applications. In closed-loop mode with encoder feedback, the SJ700 performance is said to be unmatched, delivering in excess of 100% torque at 0 Hz.

http://www.hitachi-america.us/inverters 

-Edited by Mark T. Hoske, CFE Media, Control Engineering, Plant Engineering.



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...
Hannover Messe 2016: Taking hold of the future - Partner Country status spotlights U.S. manufacturing; Honoring manufacturing excellence: The 2015 Product of the Year Winners
Inside IIoT: How technology, strategy can improve your operation; Dry media or web scrubber?; Six steps to design a PM program
World-class manufacturing: A recipe for success: Finding the right mix for a salad dressing line; 2015 Salary Survey: Manufacturing slump dims enthusiasm
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
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Warehouse winter comfort: The HTHV solution; Cooling with natural gas; Plastics industry booming
Managing automation upgrades, retrofits; Making technical, business sense; Ensuring network cyber security
Designing generator systems; Using online commissioning tools; Selective coordination best practices

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.
click me