New control system for high-capacity plants


Renholmen AB has launched a new control system that is easy to use for operators, shortens commissioning times, and thanks to modular construction will usedable for a long period of time. The hundreds of machines delivered by Renholmen to Setra Hasselfors' new high-capacity dry sorting plant will be controlled by the new programs.

In 2017, the work on the new control system began and now a completely new platform has been developed to build programs for machine control. The control system has to be modular so the same system can be used for a long time, regardless of which new technologies are added, but also to use the programs easily between the plants.

Shortens stop- and commissioning times

“Since the programs can easily be reused and we have separated programs and parameters, we can shorten the time for commissioning considerably,” says Joakim Sundström, Automation Manager at Renholmen AB.

Another focus is that the system should be easy to use for operators. They can get help to troubleshoot the machine themselves before the service personnel arrive, which shortens stop times. The operators can look at an operator panel to find out which conditions need to be met in order for the machine parts to start. It is also possible to see which sensors affect each machine part.

“We use programmable push-button panels and nested touch screens in the plant. It makes us more flexible compared to the classic plate boxes with switches and screens,” says Joakim Sundström.

For the new control system Renholmen develops programs for integrated power. The programming is integrated in the same PLC as the machine control, so it is easy to program and commission.

The development has been done with the company´s own resources and in some parts, in close cooperation with Siemens. Siemens PLC is still used for machine control, but now a transition is made to their latest control system S7-1500 and the TIA portal software.
Electro Positioner and Trimmer Electro Sinus are some of the new machines that have so far received power steering. Also the old power steering in the Flexicut is replaced by the integrated power steering.

New control system to high-capacity dry sorting plant

Renholmen is delivering the timber handling equipment to Setra’s new dry sorter planing line in Hasselfors. Machinery and equipment worth almost 20 million EURO have been purchased, and Renholmen is responsible for the vast majority. The deal is the largest in Renholmen’s history and will streamline Setra’s production significantly. Renholmens new control system for machine control will be delivered in all the machines.

Setra Hasselfors is investing in a brand new high-capacity plant in the form of a dry sorter with integrated planing line for spruce construction timber. The new line will produce 300,000 m3 of timber products every year, with planed products accounting for around two thirds.

Industry-leading technology

The dry sorter planing line comes with the very latest technology, which means that the system is fully automated. The timber is taken in from the driers in stickered packets. It is then planed, quality assessed using camera technology, cut, marked and sorted at a rate of 3-4 boards per second. The plant is built with 36 flat bins, where various qualities and lengths of timber are sorted. Timber packets are then constructed to be strapped up and packaged for further transport to the end customer. The delivery from Renholmen includes a production line that consists of a hundred or so products with tried and tested technology, as well as a number of top-notch products, such as Electro Positioner, Trimmer ElectroSinus.

Updates for older and newer plants

Renholmen has documented all facilities sold over the years and buying spare parts for Renholmen´s facilities is no problem. Over the years, many improvements and refurbishments have been made on the company's machines, which can be applied to both older and newer plants. For instance, a lot of updates have been made on power management to reduce production stoppages and increase accessibility.
Over the years, hydraulics has been increasingly replaced by electric drives.