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Remote Monitoring and Support Help Paper Mill Achieve 91 Percent Uptime

Off-site support augments on-site maintenance team and helps optimize asset performance

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Challenge

  • Paper mill needed to ensure uptime with limited engineering staff capacity for critical, 24/7 machine monitoring and maintenance

Solutions

  • PowerFlex 755 AC drive system - Provides adjustable-speed motor control for winder, dryer and reel-and-spool
  • ControlLogix controller - executes all control and motion functions
  • Assurance Integrated Support services - For real-time, application-level support; consultation on machine changes and additions; quarterly performance audits
  • Remote Monitoring and Analytics services - Provided 24/7 via Ethernet connection with real-time troubleshooting and technical support

Results

  • 91 percent system uptime
  • Reduced labor and parts costs
  • Improved asset performance
  • Increased paper machine ROI
  • Documented lifecycle savings

More. Better. Faster. That’s the slogan for any commodity manufacturer intent on prevailing in the marketplace. And it’s a familiar mantra at one paper mill in the U.S. Midwest.

Yet, while the mill produces corrugated paper from recycled paper – definitely a commodity good – the operation is far from run-of-the-mill.

For one thing, the mill has followed environmentally sound practices since opening its doors more than 50 years ago. The paper mill uses 100 percent recycled paper in its manufacturing process. The mill is also certified for the Sustainability Forestry Initiative and received the Program for the Endorsement of Forest Certification.

Today, the mill produces corrugating medium, or containerboard, for use by sheeting and box plants. The mill efficiently produces about 225,000 tons of material each year using two Fourdrinier paper machines that run at speeds in excess of 2,000 feet per minute.

Protecting a New Machine Investment

Several years ago, one of the mill’s aging paper machines began to show signs of wear and inefficiency, threatening the mill’s high standards of productivity and uptime. Replacing the colossal machine meant a major investment in time and capital, but it was unavoidable.

Once funding was approved, the mill’s small but talented staff of engineers, designers and electricians was enlisted to commission and install the new equipment, which included a new Fourdrinier paper machine and couch, press sections, dryer sections and winder. While the staff demonstrated their expertise by completing the complex machine engineering on their own, they also relied on an outside team from Rockwell Automation to help them through the startup and commissioning process.

To optimize asset performance and uptime, the mill specified a Rockwell Automation control solution. The machine, engineered by Rockwell Automation, uses an Allen-Bradley® PowerFlex® 755 AC drive system to provide adjustable-speed motor control for the wet end, dryer, reel-and-spool and winder sections. The control architecture incorporates a total of 30 drives and motors, running from 5 to 400 horsepower. The machine also is equipped with an Allen-Bradley ControlLogix® programmable automation controller to integrate the drive systems, and execute all control and motion functions.

After working through the challenges of installation and commissioning, the mill’s management realized that their ongoing maintenance requirements would exceed the capabilities of their small crew. They decided to support machine maintenance through remote monitoring.

Off-Site Expertise

“One thing I like about the PowerFlex 755 AC drives is that they’re modular, so they’re very easy for our staff to change out,” said the mill’s electrical and instrumentation technical supervisor. “At the same time, we don’t have the drive experts in place to monitor and maintain the drives around the clock. That’s where we needed some help.”

A team from the mill toured another company’s steel mill and spoke with the plant’s lead engineer about their positive experience with Rockwell Automation. Following these discussions, the team at the time was confident that a Rockwell Automation Assurance™ Integrated Support contract was the way to go.

Rockwell Automation worked closely with mill engineers and management to provide detailed financial justification for the support agreement. They used machine historical data to calculate the potential cost avoidance of downtime and labor expenses against increased uptime and efficiency. The analysis was thorough and the lifecycle savings were compelling.

Today, Rockwell Automation provides the mill with real-time, application-level industrial support from a designated team. The support includes 24/7 remote monitoring of more than 2,000 machine data points, supplemental consultation on machine changes and additions, and quarterly performance reviews.

The support includes product and programming software, and the team has continuous access to the mill’s system. Rockwell Automation engineers remotely access the system to collaboratively and proactively troubleshoot issues through a dedicated T1 line linked to the machine’s automation system via an Ethernet connection.

Improved Uptime

“The Rockwell Automation team brings a high level of application knowledge to our mill, and their support has been outstanding,” the technical supervisor said. “We had about 100 calls into the system last year, and we also get calls from them quite frequently. We work with some very dedicated people on that staff.”

As a user of recycled materials, the mill’s equipment handles a lot of sticky material that consistently builds up in the machines and coating rolls, adding to their diameter. Even a fraction of an inch of buildup on a small roller can change the gearing ratio and cause the roller to move faster, throwing off the entire production process.

When this happens, workers get online with the Rockwell Automation team to do some tension tweaking so the sheet is pulled through the second dryer section. This helps avoid production disruptions and downtime.

Another key benefit of the support has been the ability of Rockwell Automation to identify drive issues in their earliest stages. The remote-monitoring team can then notify the on-site team and work with them to resolve the problem before it turns into a failure.

“If the Rockwell Automation team gets an alarm about a potential motor or drive issue, they call and alert us of the issue,” the supervisor said. “We can often catch problems before the machine goes down."

There have been some instances where the paper machine lost one of its follower motors. Rather than causing additional production downtime to replace it, the mill team worked with Rockwell Automation to bypass the downed motor and run with two motors instead of three. This allowed production to continue running until the next scheduled downtime, when the motor could be replaced.

Recently, the application support saved the day when a drive motor on the paper machine was tripping after reaching a certain speed. It wasn’t immediately clear what was causing the issue.

“One of the Rockwell Automation technicians actually called in from home to help us resolve the issue,” the supervisor said. “She identified the encoder as the problem. That certainly helped us get the drive back up and running faster than if we didn’t have the support.”

The mill is understandably proud of its uptime rate of an average 91 percent over six months.

“The remote monitoring and support we get from Rockwell Automation has definitely helped with our uptime,” the supervisor said. “When we have a problem, it becomes their problem as well. They help us work through it and provide the additional knowledge to address the issue. That kind of help can be priceless.”

The results mentioned above are specific to this company’s use of Rockwell Automation products and services in conjunction with other products. Specific results may vary for other customers.  

Allen-Bradley, Assurance, ControlLogix and PowerFlex are trademarks of Rockwell Automation Inc.

Published 01 January 2019

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