Feature Drives, controls & transmissions Drives do the paperwork
with the latest drives,” explained UK2 Electrical RST, Paul Heywood, who is responsible for keeping the lines work- ing day and night. “We have been impressed with both their reliability and performance over the years so we naturally chose Control Techniques. The excellent support we receive from Control Techniques was a key factor in this decision.”
Two lines at one of the UK’s biggest paper mills have recently been updated with new AC drives from Control Techniques. SCA’s Trafford Park paper mill in Manchester produces a wide range of household paper products utilising recycled paper. The two lines – one for toilet tissue and the other for kitchen towels – both needed upgrading to enhance reliability, product throughput and accuracy
T
he lines are now both equipped with Unidrive SP AC drives – the tissue line with 26 drives and the paper towel line with 16. Drives range in size from 1.1kW to 20kW. The functions of the drives on the tissue line are mainly position control, control of the belt height for the parent roll and tracking, and unwind and rewind control. There is also a section that seals the cut end of the log and the high speed cutting of the log into indi- vidual toilet rolls. Tension control is crucial to prevent web breaks and sheet lengths are controlled to an accuracy of better than 0.5 mm. All the motors have resolver feedback to the drives and, within the drives, this is con- verted into a compatible scaled feed- back to the master PLC for the line. The drives on the paper towel line control all of the line functions includ-
All of the drives were installed and commissioned by Paul Heywood’s own team, all of whom have attended Control Techniques’ Unidrive SP train- ing course. “We have been helped, when needed, through both upgrades,” says Paul Heywood, “and the support generally has been superb.”
ing unwinding and rewinding, inser- tion of a new core into the log, the synchro bar to cut the log into sections, control of the diameter of the log and control of sheet length. Again, feedback from the Unimotors is by resolver signal that is scaled in the drive and retransmitted to the controlling PLC. “In order to meet our production tar- gets, both lines needed to be fitted
Two lines at SCA’s Manchester paper mill have been fitted with Unidrive SP AC drives from Control Techniques
The Unidrive SP range of AC drives is available for panel mounting, free- standing or in modular configurations from 0.37 kW up to 1.9 MW. The drives are easy to install and commis- sion and can be configured to operate in several modes including servo for synchronous permanent magnet motors / brushless servo motors. Unidrive SP offers a wide range of system integration features. Each drive can accept three option modules, allowing the user to select the level of integrated automation / motion con- trol, connectivity and I/O needed. In servo mode, as used at SCA, the drive operates as a high performance servo amplifier, matched to the Unimotor range and optimised for continuous duty applications due to its high con- tinuous output rating. SCA is one of the world’s largest personal care product companies, the world’s third largest supplier of tissue and one of Europe’s most profitable producers of forest products. Net sales in 2011 were €
11.7 billion. Tissue prod-
Control Techniques T: 01686 612300
controltechniques.com Enter 316
ucts, including handkerchiefs, napkins, toilet paper and kitchen rolls, are produced at 43 facilities in 18 countries, including the Trafford Park paper mill.
New AC variable speed drive range goes with the flow
pecifically optimised for efficient flow control with pumps and fans, AC variable speed drives in the new Vacon 100 Flow range are said to offer easy set up with dedicated application menus for water and other pump and fan segment applica- tions, economy with integrated two-zone PID control, and versatility with multimotor control facilities provided as standard. Available with power ratings from 0.55kW to 160kW, the Vacon 100 Flow drives
S
are said to allow substantial energy savings to be achieved compared with the use of fixed-speed drives. They are based on the proven technology in Vacon’s Vacon 100 family of multipurpose ac drives, and provide an extensive range of features that make life easier and save money in pump and fan applications. These features include dual-zone PID control, which allows two process parame- ters to be controlled simultaneously; integrated frost protection; start and sleep
Factory Equipment MARCH 2013
boosting; soft pipe filling, which runs pumps at low speed until the pipes are filled; and an anti-ragging function that detects when a pump is blocked and initiates a user-defined cleaning sequence. Vacon 100 Flow drives also incorporate a real-time clock that allows pump duties to be rotated at preset times to equalise wear. The clock can also be used for other forms of scheduling and to generate time-stamped diagnostic information. In addition, the drives have a run-to-destruction fire mode, making them suitable for use in sprinkler and emergency ventilation systems. Vacon
www.vacon.com
T: 01455 611515 Enter 317
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