{"id":3573,"date":"2026-10-21T14:48:49","date_gmt":"2026-10-21T06:48:49","guid":{"rendered":"http:\/\/www.amirzajavab.com\/blog\/?p=3573"},"modified":"2026-10-21T14:48:49","modified_gmt":"2026-10-21T06:48:49","slug":"what-are-the-electromagnetic-interference-characteristics-of-auxiliary-machines-440e-1c5729","status":"publish","type":"post","link":"http:\/\/www.amirzajavab.com\/blog\/2026\/10\/21\/what-are-the-electromagnetic-interference-characteristics-of-auxiliary-machines-440e-1c5729\/","title":{"rendered":"What are the electromagnetic interference characteristics of auxiliary machines?"},"content":{"rendered":"

What\u2019s up, fellow maintenance folks, plant managers, and anyone who\u2019s ever dealt with wonky machinery that just won\u2019t play nice? If you\u2019re here because your auxiliary machines are throwing weird electrical glitches, or you\u2019re trying to figure out why they\u2019re messing with other gear on the floor, you\u2019re in the right spot. Full transparency here: I\u2019m not a PhD holding a binder full of jargon (though I\u2019ve probably read my fair share of those). I\u2019m the guy who runs an auxiliary machines supply company, and I\u2019ve spent the last decade troubleshooting these exact headaches with clients across manufacturing, food processing, and even data centers. Auxiliary Machines<\/a><\/p>\n

<\/p>\n

Today we\u2019re breaking down electromagnetic interference (EMI) with auxiliary machines \u2013 not the textbook version, but the real-world stuff that actually shows up on your line\u2019s PLC screen, lights up your diagnostic tools, and makes your entire shift longer than it needs to be. Let\u2019s start with the basics that actually matter: what makes auxiliary machines different from, say, a big primary motor driving the entire production line? Auxiliary machines \u2013 think conveyor belts, pump units, compressors, small hydraulic systems, even those compact industrial fans that keep parts cool \u2013 are often overlooked when it comes to EMI, but they\u2019re everywhere, and their unique design traits make EMI way more likely to sneak through, unlike those larger, more robust primary systems.<\/p>\n

First up, let\u2019s talk about the core EMI characteristics specific to these workhorses. The big one I see all the time is their tiny, power-dense components. A lot of auxiliary machines are built to be compact \u2013 you need a pump that fits under a food processing tank, a conveyor that slides between two assembly stations, right? So manufacturers cram a lot of electronics and switching parts into a small space. Those high-speed switching diodes, relays, and variable frequency drives (VFDs) that are used to adjust speed on pumps and conveyors? They generate rapid current and voltage spikes that radiate electromagnetic waves \u2013 that\u2019s EMI. Unlike a big primary motor that\u2019s often grounded and shielded by its own bulky frame, these small auxiliary parts don\u2019t have the same level of built-in shielding. So that EMI doesn\u2019t just stay inside the machine \u2013 it leaks out.<\/p>\n

Another key trait: most auxiliary machines are hardwired to the main power grid, not powered by their own isolated system. That means the EMI they generate doesn\u2019t just radiate through the air (that\u2019s radiated EMI, by the way) \u2013 it also gets conducted right back through the power lines to every other device on the same circuit. I had a client in a bottling plant last year whose auxiliary pump for the filler line was causing the label printer 20 feet away to misapply stickers randomly. Turns out the pump\u2019s VFD was spiking so bad, every time it cycled, the current on the shared power line dropped just enough to mess with the printer\u2019s timing board. That\u2019s conducted EMI in action, and it\u2019s way more common with auxiliary machines because they\u2019re usually connected to the same power source as sensitive control gear, not their own dedicated circuit.<\/p>\n

Wait, let\u2019s not forget about switching noise from on\/off cycles. A lot of auxiliary machines \u2013 especially smaller ones used in batch processing \u2013 turn on and off dozens of times an hour. Every time a relay switches the machine on or off, there\u2019s a momentary surge in current. That surge creates a burst of EMI, and if that happens hundreds of times a day, it adds up. Compare that to a primary motor that runs non-stop for weeks at a time \u2013 it doesn\u2019t have those frequent switching events, so it generates way less of that burst EMI. I\u2019ve seen this show up in woodworking shops, too: their auxiliary dust collection fans cycle on and off with each machine tool, and the EMI from those cycles messes with the shop\u2019s temperature control system.<\/p>\n

Now, here\u2019s the part that makes this personal for me: a lot of clients reach out thinking \u201call EMI is the same\u201d when their auxiliary machine is causing issues, but it\u2019s not. There are actually two main types of EMI we deal with here, and auxiliary machines are especially prone to both. First is the high-frequency radiated EMI I mentioned earlier \u2013 that\u2019s the stuff that messes with wireless devices, like Bluetooth scanners used for inventory in a warehouse, or even the Wi-Fi on a plant floor. A client in an e-commerce fulfillment center had their portable scanners dropping connections left and right, and after testing, we found the auxiliary conveyor\u2019s motor was emitting high-frequency waves right at the 2.4 GHz band that most scanners use. That\u2019s not the primary conveyor driving the line \u2013 that\u2019s the little auxiliary conveyor that moves empty boxes from the stack to the main line. Makes sense, right?<\/p>\n

The other type is low-frequency conducted EMI, which is even sneakier because you can\u2019t see it, but it breaks your gear. This is the current spikes and noise that travel through power lines, communication cables, and even the ground connections between machines. Auxiliary machines often use lower-voltage control signals (like 24V DC for their sensors) that are way more sensitive to these voltage spikes than the higher-voltage power used on big primary motors. So a spike that\u2019s just a blip on a main motor\u2019s power line can fry a sensor or a PLC input on an auxiliary machine, or on a device nearby.<\/p>\n

But wait, it\u2019s not just about the EMI coming from auxiliary machines \u2013 they\u2019re also really susceptible to EMI from other sources. I see this all the time when clients install new auxiliary equipment next to older gear. For example, if you put a new, high-speed auxiliary pump next to an old welding machine, the welding machine\u2019s high-frequency EMI can mess with the pump\u2019s control board, making it run erratically. The thing about auxiliary machines is that their control systems are often cheaper, less shielded, and not rated for the same EMI environment as primary systems. So they\u2019re like the canary in the coal mine for EMI problems on the plant floor \u2013 if your auxiliary machines are glitching, it\u2019s often a sign that your entire facility\u2019s EMI is out of balance.<\/p>\n

Now, let\u2019s talk about why understanding these characteristics matters, especially if you\u2019re buying auxiliary gear (hi, that\u2019s my team\u2019s wheelhouse!). When we supply auxiliary machines, we don\u2019t just hook them up and walk away \u2013 we test their EMI output and their immunity to incoming EMI on every unit, because we know how much of a headache it causes when they don\u2019t meet standards. A lot of cheaper auxiliary machines on the market skip basic EMI mitigation to cut costs \u2013 things like adding shielding to the control cables, filtering the power input, and using soft starters instead of hard relays to reduce switching surges. Those little additions might add a few bucks to the price tag, but they save you from downtime, lost production, and repair bills that add up way more than that upfront cost.<\/p>\n

I had a great client in a pharmaceutical manufacturing facility last year who learned this the hard way. They bought cheap auxiliary mixers from a random supplier, and within three months, half their mixers were throwing errors because their control boards were being fried by EMI from a nearby compressor. They reached out to us, and when we replaced those cheap mixers with our units, which have built-in EMI filtering and shielded control wiring, they didn\u2019t have a single glitch in over two years. That\u2019s not a sales pitch \u2013 that\u2019s real results from understanding the EMI characteristics of auxiliary machines.<\/p>\n

Here\u2019s a pro tip I\u2019ve picked up over the years: if you\u2019re dealing with EMI from auxiliary machines, first do a quick test to figure out where it\u2019s coming from. Use a simple EMI detector (you can pick up a cheap one online for under $100) and walk around the plant with it when the auxiliary machine is running. Hold it near the power lines, the motor housing, the control panel, and any nearby sensitive gear. You\u2019ll usually spot the source pretty quickly \u2013 either the motor itself, the VFD, or the control system. Once you know the source, you can fix it, whether that\u2019s adding a line filter to the power input, shielding the control cables, or installing a separate ground for the auxiliary machine.<\/p>\n

Another common misconception: people think that only new auxiliary machines generate EMI. But older auxiliary machines \u2013 the ones that have been running for 10+ years \u2013 have components that wear out, and their shielding can degrade over time. So an old pump that used to run fine might start emitting EMI a year or two before it fails completely, just because its internal parts are breaking down. That\u2019s why it\u2019s good to keep an eye on your auxiliary machines\u2019 EMI levels, not just their performance. If you start seeing random glitches, check the older auxiliary gear first \u2013 that\u2019s usually the culprit.<\/p>\n

Now, let\u2019s get into the technical stuff that actually lines up with industry standards, because I know you care about that too. The main standards we test auxiliary machines to are IEC 61000-6-2 (for industrial environments) and IEC 61000-6-4 (emissions for industrial equipment). Auxiliary machines have to meet both: they can\u2019t emit too much EMI that messes with other gear, and they have to be able to handle the EMI that\u2019s present in a typical industrial plant. The key characteristics that we test for are radiated emissions in the 30 MHz to 1 GHz range (that\u2019s the band where most PLCs, scanners, and wireless devices operate) and conducted emissions on the power lines in the 150 kHz to 30 MHz range. That\u2019s exactly the range that most auxiliary machines struggle with, because their small components operate in that same frequency band.<\/p>\n

Why does that matter? Because if an auxiliary machine\u2019s emissions are above the IEC standard, it\u2019s not just a nuisance \u2013 it can cause compliance issues for your entire facility. For example, data centers have strict EMI requirements to protect their servers, and if an auxiliary cooling fan (which is a key part of data center infrastructure) emits too much EMI, it can cause server errors, which are catastrophic for uptime. Manufacturing plants have similar requirements because their production lines have precise timing requirements, and even a small EMI blip can lead to a batch of product being ruined.<\/p>\n

Let me circle back to my own business for a second, because that\u2019s how you know I\u2019m not just regurgitating textbook info. Every auxiliary machine we ship goes through a 15-minute EMI test before it leaves our warehouse. We hook it up to a power source, run it at full speed and half speed, cycle it on and off a bunch of times, and use our EMI detector to check for emissions. If a unit is even 10% over the IEC standard, we don\u2019t ship it \u2013 we go back to our team of engineers and adjust the filtering or shielding. Why? Because I\u2019ve seen too many clients waste money on auxiliary machines that cause more problems than they solve, and I\u2019m not here to be that supplier. My team\u2019s whole thing is delivering auxiliary machines that are reliable, and that means they don\u2019t mess with the rest of your gear.<\/p>\n

Now, let\u2019s talk about what you can do if you\u2019re dealing with EMI from your current auxiliary machines, even if they\u2019re not from my company (no hard feelings, I get it). First, check the power source: is your auxiliary machine on a dedicated circuit, or is it sharing a line with sensitive control gear? If it\u2019s sharing, installing a line filter on the auxiliary machine\u2019s power input can cut conducted EMI by 80% or more. Second, check the control cables: are they running parallel to power cables? That\u2019s a big one \u2013 if your sensor cable is running next to your pump\u2019s power cable, the power cable\u2019s EMI can couple into the sensor cable and cause glitches. Separating those cables by at least a foot, or using shielded control cables, fixes that 9 times out of 10. Third, make sure the auxiliary machine is properly grounded \u2013 a lot of EMI is caused by poor grounding, and adding a separate ground rod for the auxiliary machine can reduce radiated emissions a lot.<\/p>\n

But if you\u2019re at the point where you need to replace your auxiliary machines, don\u2019t just grab the cheapest option. Ask the supplier about their EMI testing and mitigation. Do they use line filters? Shielded control wiring? Soft starters instead of hard relays? Those are the things that make a big difference. And if you work with a supplier that actually understands auxiliary machines (not just generic industrial gear), they\u2019ll ask you about your facility\u2019s specific EMI environment \u2013 like if you\u2019re in a data center, a food processing plant, or a warehouse \u2013 and adjust their machines accordingly.<\/p>\n

Wait, let\u2019s wrap this up with a real quick example that drove this home for me. A client in a meat processing plant had three auxiliary conveyors next to each other, and every time two ran at the same time, the third would stop randomly. They tried everything: replacing PLCs, changing wiring, even rewiring the entire circuit. Nothing worked. We showed up, ran an EMI test, and found that the two conveyors\u2019 VFDs were emitting EMI that was exactly at the frequency of the third conveyor\u2019s control board. The solution? We added small line filters to each VFD, and the problem was gone. Total fix time: 2 hours. Total cost: way less than what they would have spent if they\u2019d just guessed and replaced gear randomly. That\u2019s the power of understanding the EMI characteristics of auxiliary machines \u2013 it\u2019s not rocket science, but it does require knowing what to look for.<\/p>\n

So, to sum up what we covered today: auxiliary machines have unique EMI characteristics because they\u2019re compact, use switching parts, often share power lines with sensitive gear, and have less built-in shielding than primary systems. They generate both radiated high-frequency EMI that messes with wireless devices and conducted low-frequency EMI that messes with control gear. They\u2019re also more susceptible to outside EMI than larger primary motors. The good news is that with simple fixes like line filters, shielded cables, proper grounding, and machines that are tested for EMI, you can eliminate almost all of these issues.<\/p>\n

<\/p>\n

If you\u2019re dealing with EMI headaches from your auxiliary machines, or you\u2019re in the market for new ones that won\u2019t cause those headaches, reach out. My team can help you test your current setup, find the source of the EMI, and supply auxiliary machines that are built to handle your facility\u2019s specific needs, no hidden surprises, no weird glitches mid-shift. We\u2019ve worked with plants of all sizes, from small local manufacturers to large national facilities, and we know how to make this stuff work for you.<\/p>\n

Blow Mold&Injection Mold<\/a> References<\/p>\n

    \n
  1. IEC 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity for industrial environments<\/li>\n
  2. IEC 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards – Emission standard for industrial environments<\/li>\n
  3. Bolton, W., "Electromagnetic Compatibility in Industrial Control Systems", Newnes, 2016<\/li>\n
  4. Miller, T.J.E., "Variable Frequency drives: Selection and Optimization", Wiley-IEEE Press, 2017<\/li>\n
  5. Federal Communications Commission (FCC), Part 15: Radio Frequency Devices, 2022<\/li>\n<\/ol>\n
    \n

    Dongguang Golden Sincerty Machinery Manufacturing Co., Ltd.<\/a>
    As one of the most professional auxiliary machines manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to buy advanced auxiliary machines in stock here from our factory.
    Address: NANXIAKOU DEVELOPMENT ZONE DONGGUANG COUNTY CANGZHOU CITY HEBEI PROVINCE CHINA
    E-mail: jcx15076789099@outlook.com
    WebSite:     https:\/\/www.jkingmachinery.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    What\u2019s up, fellow maintenance folks, plant managers, and anyone who\u2019s ever dealt with wonky machinery that … What are the electromagnetic interference characteristics of auxiliary machines?<\/span>Read more<\/a><\/p>\n","protected":false},"author":243,"featured_media":3573,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3536],"class_list":["post-3573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-auxiliary-machines-4c71-1c8bcb"],"_links":{"self":[{"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/posts\/3573","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/users\/243"}],"replies":[{"embeddable":true,"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/comments?post=3573"}],"version-history":[{"count":0,"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/posts\/3573\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/posts\/3573"}],"wp:attachment":[{"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/media?parent=3573"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/categories?post=3573"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.amirzajavab.com\/blog\/wp-json\/wp\/v2\/tags?post=3573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}