classic | mobile
 

Search...

SA Instrumentation & Control Buyers' Guide

Technews Industry Guide - IIoT 2017

Technews Industry Guide - Maintenance, Reliability & Asset Optimisation

 

Drives save the day
August 2009, Motion Control & Drives


Elevator drives system stops maintenance costs going up.

When an elevator in a cheese drying system broke down at a Danish dairy the entire plant was brought to a standstill with a loss of some five tonnes of cheese per hour. The suppliers estimated that it would take a fortnight to get the parts to rectify the situation. Engineering staff were facing the possibility of having to remove stocks of unfinished cheese to warehouses elsewhere, with storage and transport costs escalating as time went on.

“We already used drives from Control Techniques elsewhere in the plant, so I contacted Jens Holst at the Control Techniques Drive Centre in Greve. He and his team replaced the existing software with their own elevator software and managed to get us up and running again later that same day,” says Per Hansen, chief electrical engineer at MD Foods’ dairy in Denmark.

“We had been having constant problems with the original programming,” explains Hansen. “It was written in such a way that we could not adjust the programming ourselves and we had already spent some £8000 trying to get it right. In one day, Control Techniques achieved what the manufacturers could not. But it was a temporary fix and we asked Control Techniques to give us a better permanent solution.”

Plug-in control

Some months later, Control Techniques Denmark carried out a complete rebuild of the elevator control system utilising Unidrive AC drives and 115 UMB Unimotor servo motors under the overall control of the existing PLC controller. Each of the Unidrives, working in servo mode, is fitted with the unique Control Techniques plug-in program module. In co-operation with the supplier of the PLC controller, Control Techniques software engineers completely rewrote the positioning software.

“The instruction comes from the PLC, but all of the positioning is now carried out by the software within the Unidrives’ own program modules, completely eliminating any further operational problems,” says Hansen.

The elevators feed 200 gm packs of cheese into, and remove them from, a 21 level cheese dryer. Packets of feta and mozzarella cheese are cooled and dried in long tunnels prior to being sent to the packing department. The PLC selects the level for each pack of cheese and then the Unidrive servo system takes over, moving the elevator adjacent to the chosen track where the pack is pneumatically pushed onto a slow moving conveyor.

Feedback is from shaft-mounted encoders on the Unimotor brushless servo motors.

Superior performance

“The system now responds faster, more accurately and above all, reliably. Reliability is my number one requirement in this production facility. Each week I have to answer for every minute’s lost production and what I am doing to eliminate weak points. That is why I have used Control Techniques drives ever since this plant opened in 1989,” continues Hansen.

“Unidrives are used in various locations, but we are not using the plug-in program modules yet, except on the drier,” he adds. “I plan to do so in the future because it will make maintenance so much faster and easier. If I have to change a drive, there is no reprogramming of parameters. Just plug in the module and off it goes. If it saves even five minutes, it is a good investment.”

The dairy has an annual output of around 35 000 tonnes of mozzarella and feta-type soft white cheese. “This is a very busy plant,” concludes Hansen, “and any stoppage has major cost implications. That is why I need complete confidence in my drives and in the local support that is available. With Control Techniques, I have both!”

For more information contact Bill Tedd, Control Techniques, +27 (0)11 462 1740, bill.tedd@emerson.com, www.controltechniques.com


Credit(s)
Supplied By: Nidec
Tel: +27 11 462 1740
Fax: +27 11 462 1941
Email: ryan.chetty@mail.nidec.com
www: www.nidecautomation.com
Share via email     Share via LinkedIn   Print this page

Further reading:

  • Case History 160: More problems with control
    May 2018, Michael Brown Control Engineering, This Week's Editor's Pick, Motion Control & Drives
    In a recent assignment to sort out problems being experienced in a petrochemical refinery, I came across the following two examples:       Drum pressure misbehaving The first was with the control of an ...
  • SEW-Eurodrive cuts costs in ­materials handling supply chain
    May 2018, SEW-Eurodrive , Motion Control & Drives
    The latest trend in materials handling has seen sectors such as warehousing, packing and pick-and-place use cheaper components for light load conveyor applications in order to reduce total supply chain ...
  • Kinetic sculpture interacts with water and light
    May 2018, Beckhoff Automation, Motion Control & Drives
    A fascinating play of water, light and motion.
  • Faulhaber motors for Mars
    May 2018, Horne Technologies, Motion Control & Drives
    2020 is the year of the next rover mission to Mars. The main payload of the Russian Proton rocket is the ExoMars rover, developed by the European and Russian Space Agencies (ESA and Roskosmos). The plan ...
  • Format change at the push of a button
    May 2018, Festo, Motion Control & Drives
    Two Festo innovations enable fast and straightforward format changes on just one machine.
  • Sew-Eurodrive develops fan and pump control for niche applications
    May 2018, SEW-Eurodrive , Motion Control & Drives
    From wine farms to mining, the new LTP-B Eco drive from SEW-Eurodrive is finding application in a range of sectors. This purpose-built drive is distinguished by the fact that different parameters can ...
  • Linear actuator drive selection
    April 2018, Parker Hannifin - Sales Company South Africa, Motion Control & Drives
    No ‘one size fits all’ for linear motion system drive train designs.
  • New rodless cylinder for compact machine design
    April 2018, Tectra Automation, Motion Control & Drives
    Aventics has recently launched a new double-acting RTC rodless cylinder range for high-performance applications that require a compact machine design. As with other Aventics double-acting rodless cylinders, ...
  • Autonomous food robots move with the times
    March 2018, Omron Electronics, Motion Control & Drives
    As with many other industries in the world today, food and beverage manufacturers are under immense pressure to increase productivity and sales, while keeping manufacturing costs down. A normal reaction ...
  • The benefits of easy access to accumulator services
    March 2018, Parker Hannifin - Sales Company South Africa, Motion Control & Drives
    Modern industry needs far more from its suppliers than straightforward product sales. Instead, today’s technology providers must support their customers with accessible and targeted services that, for ...
  • How drives are revolutionising the printing industry
    March 2018, Nidec, Motion Control & Drives
    Whether it’s for actual printing press machinery or supplementary systems, such as inserters, reel stands and cart loaders, many in the print industry are taking steps to replace DC drives with AC drives ...
  • Cost-cutting boosts uptake of IE3-compliant motors
    March 2018, SEW-Eurodrive , Motion Control & Drives
    Rising energy costs, increasingly stringent international regulations, and a global drive to reduce carbon emissions has resulted in pulp and paper customers opting for SEW-Eurodrive South Africa’s highly ...

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronic Buyers Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual





 

         
    classic | mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.