Control Techniques’ cutting-edge DC drives selected to modernize aging port cranes
MINNEAPOLIS, MN - Advanced DC drives from Control Techniques, an Emerson Industrial Automation company, were selected by Terminal de Contenedores de Yucatán (TCY), to modernize the control system on an aging ship-to-shore crane in Progreso, México.
TCY, owned by Grup TCB of Spain, is the most important container and cargo-handling terminal in Mexico’s Yucatan peninsula. When the terminal began operation in 2005, the two Panamax Starporter ship-to-shore cranes, manufactured by Star Iron Steel of Tacoma, WA, were already nearly 30 years old. Seven years later, keeping the cranes operational had become difficult due to increasing downtime and escalating maintenance costs. David Asensio, Project Manager for Grup TCB, commented at the time, “The cranes are in good mechanical condition, but poor electrical condition.” Replacement parts for the old DC drives had become nearly impossible to find and could take weeks to obtain, leading to unacceptable downtime.
For this application, Control Techniques proposed an all-new, fully integrated drive and control system featuring its Mentor MP DC drive. Mr. Asensio explains, “After reviewing the competition, we decided that Control Techniques has the best DC drive. The Mentor MP DC drive has a rugged design that is easy to maintain, a matter that is sometimes not taken into account. For us, Emerson is the right solution.”
Control Techniques’ new control system encompasses all the electrical equipment including low- voltage auxiliaries, DC drives, PLC, I/O, crane management system and MCC. Also included are new remote I/O and control stations, RF Ethernet-based remote diagnostics, and a modern rotating operator’s chair and consoles to replace the old sliding chair and fixed consoles. This cost-effective Control Techniques solution provides TCY with a higher degree of reliability to increase uptime, a rapid supply of spares and remote monitoring and diagnostics to facilitate troubleshooting and maintenance.
For the hoist (which utilizes a 500hp motor rated at 50 tons and has a speed of 45 meters/min) a 120Amp Mentor MP was selected. The 75hp trolley, with a speed of up to 120 meters/min and the 75hp boom with a maximum speed of 6 meters/min share a 210Amp Mentor MP, which is switched between the two. The eight 18hp, 45 meters/ min gantry motors have their duty shared between four 105Amp Mentor MP DC drives.
The Mentor MP is a reliable, flexible and powerful digital DC drive designed to maximize motor performance, enhance system reliability and interface digitally with the latest control equipment using Ethernet and a wide range of industrial networks. This makes the Mentor MP an ideal solution for modernizing port cranes and equipment.
The drives feature a series of user-configurable functions (master-follower management, electric shaft function, digital or analog feedback, torque control, etc.) that are arranged logically in different menus and preconfigured with default values to facilitate commissioning.
The operational parameters can be selected and modified from the drive keypad or through the Windows-based software, CTsoft. The SM-Application solution module is an easy plug-in second processor, capable of writing application-specific programs without using a PLC or standalone controllers. It is programmed using SyPT, an IEC 1131-compliant programming tool incorporating function blocks programming.
The SM-Application modules of the two drives that operate the hoisting motors and connect via Control Techniques’ own high-speed network, CT-net, use a load balancing function to control container hoisting and calculate the maximum lifting speed as a function of the load hooked to the spreader. With the spreader empty, the SM-Application modules enable movements at the maximum programmed speeds.
In this case, crane productivity is maximized by using a series of customized basic, modular and open-ended software packages, developed by Control Techniques specifically for crane control. These are programmed into the PLC and onboard SM-Application modules, and connected via fieldbus, optimizing movements in order to relieve the operator of these delicate and repetitive tasks.
Hoisting, trolley, boom and gantry movements are all driven by DC motors that are controlled by means of Mentor MP digital drives connected via a Profibus network to a controlling PLC.
Control Techniques also designed the Crane Management System integrated into its basic software and enhanced with control modules for the maintenance guide and diagnostics. Operational at the various levels of automation, these software packages automatically signal events as they occur, guiding the operator in maneuvers and assisting technicians with repair and preventive maintenance operations.
About Control Techniques
Control Techniques, an Emerson Industrial Automation company, is a world leader in the design and production of electronic variable speed drives for the control of electric motors. The company’s strategy is to concentrate on delivering drives and servo products that enhance the productivity of its customers’ machines and processes. For more information, visit www.ControlTechniques.com
About Emerson Industrial Automation
Emerson Industrial Automation, a business of Emerson, is a global technology provider that enables productivity, efficiency and quality gains for customers across a spectrum of industries. Its products include alternators, electric motors and drives, electrical distribution devices and mechanical power transmission, fluid automation and ultrasonic joining solutions. Emerson brands include Appleton, ASCO, Branson Ultrasonics, Browning, Control Techniques, Kop-Flex, Leroy-Somer, McGill, Morse, Numatics, O-Z/Gedney, Rollway, SealMaster, and System Plast. For more information, visit www.EmersonIndustrial.com
Emerson (NYSE: EMR), based in St. Louis, Missouri (USA), is a global leader in bringing technology and engineering together to provide innovative solutions for customers in industrial, commercial, and consumer markets around the world. The company is comprised of five business segments: Process Management, Industrial Automation, Network Power, Climate Technologies, and Commercial & Residential Solutions. Sales in fiscal 2012 were $24.4 billion. For more information, visit www.Emerson.com
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