As a feeding and conveying equipment supplier, I’ve spent the last 12 years on the floor with manufacturing, food processing, and pharmaceutical plant managers, and one problem I hear about more than any other—after wear and tear—is electromagnetic interference (EMI). It’s not a topic that makes trade show headlines or shows up on spec sheets often, but it’s the quiet culprit behind production delays, wasted batches, and unexpected repair bills that keep maintenance teams up at 2 a.m. Last month, I sat in on a call with a snack food plant manager who had to shut down his entire line for 14 hours because a random EMI surge fried the conveyor’s weighing sensor mid-run, ruining 20,000 pounds of cereal. That’s the kind of real-world chaos EMI causes, and it’s not a problem you can ignore—especially when our equipment is supposed to keep your lines running, not bring them to a halt. Feeding & Conveying Equipment
First, let’s get clear on what we’re talking about here, because not every electrical blip counts as EMI. EMI is when electromagnetic energy from an external source disrupts the electrical signals our equipment relies on to operate. It’s invisible, for the most part, and comes from both close and far: nearby welding machines, variable frequency drives (VFDs) on other parts of the line, cell towers, even the wireless access points in your break room. The big issue for feeding and conveying equipment is that these machines aren’t just moving material—they’re using precision electronics every step of the way. From the proximity sensors that count packaged goods on a conveyor belt to the load cells that measure how much product a hopper feeds, every component runs on small, low-voltage signals that EMI can scramble.
Let’s break down the most common effects I’ve seen, and how they play out in the plants our clients run. The first one, and probably the most frustrating for operators, is intermittent equipment failure. You know the scenario: the conveyor works fine at 8 a.m., acts up for 10 minutes at 10:30, then works perfectly for the rest of the shift. Last year, we had a pharmaceutical client who kept reporting that their tablet feeder would sporadically skip doses during production batches of a generic blood pressure drug. They checked everything—vibration levels, feeder alignment, even the quality of the metal frames. Turns out the problem was a new emergency lighting system installed in another part of the plant that was emitting narrow-band EMI right around the frequency the feeder’s control board uses. Because the interference wasn’t constant, maintenance teams couldn’t replicate the issue during their scheduled checks, so it took three months to fix. That’s three months of lost batch time, extra testing for out-of-spec product, and a team that was convinced their equipment was unreliable, not the victim of EMI.
Next on the list is signal degradation and measurement inaccuracy, which is a huge deal for industries where precision is non-negotiable. For food processing clients, that means product waste. If a conveyor’s load cell that measures sugar for a cookie batch is thrown off by EMI, you get either too much sugar (which costs money) or too little (which means you have to rework the entire batch). For packaging lines, proximity sensors that count bottles or cans can misread a signal, leading to a pack with only 11 items, not 12, and a recall later on. I remember a beverage client a few years back who had to pull 12,000 cans of soda from grocery stores because their conveyor’s sensor misread the can’s bottom, marking a defective can as good. The root cause? A 5G tower that came online three miles from their plant—something they never would have expected when they built their line. EMI from outside sources isn’t just a small, internal plant problem anymore; it’s coming from infrastructure we didn’t have 10 years ago, and it’s reaching equipment that used to be separate from the grid’s noisier parts.
Then there’s component damage, which is the most expensive effect, not just in parts but in downtime. Continuous exposure to EMI can wear down sensitive electronics over time, even if it doesn’t cause an immediate failure. VFDs, which we use on most conveyors to adjust speed, are particularly vulnerable—EMI surges can damage their internal capacitors, control boards, and motor windings, leading to premature failure. Last quarter, a mining aggregate client called us in because their conveyor’s drive motor was dying every 18 months, instead of the expected 5-year lifespan. We tested their facility and found that their nearby material handling crane was emitting heavy, transient EMI every time it lifted a load. The repeated surges were frying the motor’s control module, and without shielding, there was nothing we could do to extend its life beyond 2 years max. Replacing that motor every 18 months cost them $12,000 per unit, plus 8 hours of downtime each time—totaling $32,000 a year in extra costs for something that could have been prevented with basic EMI mitigation.
Now, you might be thinking: “This sounds like a problem that only affects old equipment, or equipment in messy facilities.” But that’s not true. We build our feeding and conveying equipment to be tough—we use stainless steel for frames, sealed enclosures for electronics, all that good stuff—but even our standard builds can be vulnerable if they’re not designed with EMI in mind. Let’s talk about why our equipment is especially at risk: we integrate so many smart features now, from IoT-enabled monitoring that tracks conveyor speed and motor health in real time to automated feeding systems that adjust product flow based on sensor data. Those smart features rely on small, low-power digital signals, which are much easier to disrupt than the analog controls we used 20 years ago. A basic 1990s conveyor with a simple on/off switch might never have an EMI problem, but a modern feeder that uses Bluetooth connectivity for diagnostics? That’s a sitting duck for interference from even a weak signal source.
So, what can we, as both suppliers and your partners, do about this? Over the last five years, we’ve worked with our engineering team to build EMI mitigation into every new piece of equipment we design, not as an afterthought. First, we use shielding on all sensitive control boards, sensors, and cables. Not just a wrap of aluminum foil—we use galvanized steel enclosures for all electronic components, and we run signal cables separate from power cables (at least 12 inches apart) to prevent crosstalk, which is a common internal source of EMI within a plant. We also use filtered power inputs on every unit, which block transient surges from the grid before they can reach our equipment’s electronics. For clients operating in high-EMI environments—like steel mills, pharmaceutical facilities with lots of machinery, or plants near urban infrastructure—we offer customized shielding: larger enclosures, shielded cables, even isolated grounding systems to keep our equipment separate from the plant’s shared electrical ground, which is a huge source of EMI in older facilities.
But here’s the thing: EMI mitigation isn’t something that stops when we install the equipment. Our job as a supplier is also to help our clients understand how to manage EMI on their end. We do free on-site assessments for new clients, where we walk their facility, test for EMI hot spots, and give recommendations for both our equipment and their existing infrastructure. Last year, we worked with a pet food plant that was struggling with constant feeder errors. We installed shielded cables on their new conveyor, repositioned their control panel away from a welding station, and recommended they add ferrite cores to the power lines running to their VFDs. The downtime dropped by 90% within a month, and their batch waste went from 4% to less than 1%. Small changes, but they made a huge difference.
I also want to be honest: EMI is not something you can 100% eliminate, especially as more industrial facilities adopt smart technology and cellular infrastructure expands. But what you can do is choose equipment that’s designed to handle it. Too many plant managers make the mistake of buying the cheapest conveyor they can find, only to end up paying way more in repairs and downtime down the line. We’ve had clients come to us after buying a conveyor from a non-specialized supplier that had constant EMI issues, and they had to replace the entire electronics suite within two years because the manufacturer didn’t include any shielding. That’s a false economy, plain and simple.
Looking ahead, EMI is only going to get more of a focus as industrial automation grows. More IoT sensors, more wireless controls, more VFDs—all of these add to the electrical noise in a plant. As a feeding and conveying equipment supplier, we’re staying ahead of that. We’re testing all our new equipment in our in-house EMI chamber, simulating signals from 5G towers, welding equipment, and wireless devices, to make sure our gear keeps working even in the noisiest environments. We’re also updating our training for operators, so they know how to spot the signs of EMI—like intermittent sensor errors, unexpected speed fluctuations, or error codes that pop up for no obvious reason—instead of assuming it’s a faulty part or a setup mistake.
If you’re dealing with unexplained downtime, product waste, or equipment errors that you can’t pin down to wear and tear, EMI is almost certainly part of the problem. It’s not a problem you have to solve alone. We’ve helped hundreds of plants identify and fix EMI-related issues with their feeding and conveying equipment, and we can help yours too. Whether you’re looking for new equipment designed with EMI mitigation in mind, or you just want to troubleshoot the issues you’re already having, our team is here to walk through your facility with you, test the electrical environment, and find a solution that works for your production needs and your budget.
Stop letting invisible EMI disrupt your line, waste product, and cut into your profits. Reach out to our team of feeding and conveying equipment experts today to schedule a consultation, and let’s figure out how to keep your operations running smoothly, no matter what electrical noise is around.
Skew Rolling Mill Rolls References
- Bolton, W. (2015). Instrumentation and Control Systems (2nd ed.). Newnes.
- IEEE Standards Association. (2018). IEEE Standard for Electromagnetic Compatibility – Part 6: Generic Standards – Industrial Environments (IEEE Std 61000-6-2:2018). Institute of Electrical and Electronics Engineers.
- Manus, J. (2020). Electromagnetic Interference in Industrial Automation: Causes, Effects, and Mitigation Strategies. ISA Transactions, vol. 102, pp. 112–124.
- National Sanitation Foundation (NSF). (2021). Electromagnetic Compatibility Guidelines for Food Processing Equipment. NSF International.
Shenyang Muren Machinery Co., Ltd.
Address: No.16 Nansan Road, Shenyang Jinhai Economic Zone, Liaoning Province, China
E-mail: mulunjixie@163.com
WebSite: https://www.symuren.com/
