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.
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, 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.
- Related News:
Pack Expo Las Vegas 2011: Automation products target machine builders - 03.10.2011 15:46- KEPCO selects control system for its first 1,000 MW ultra-supercritical units in South Korea - 21.04.2011 16:15
Case Study Database
Get more exposure for your case study by uploading it to the Plant Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.
These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.
Click here to visit the Case Study Database and upload your case study.
2012 Salary Survey
In a year when manufacturing continued to lead the economic rebound, it makes sense that plant manager bonuses rebounded. Plant Engineering’s annual Salary Survey shows both wages and bonuses rose in 2012 after a retreat the year before.
Average salary across all job titles for plant floor management rose 3.5% to $95,446, and bonus compensation jumped to $15,162, a 4.2% increase from the 2010 level and double the 2011 total, which showed a sharp drop in bonus.