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Get Started TodayExtruder control systems don'tusually fail without warning. In most cases, there are signs — some obvious,some subtle — that a system is deteriorating and headed toward a failure. Theproblem is that many facilities aren't equipped to recognize those signs untilit's too late, or they recognize them but lack the urgency to act before theline goes down.
Knowing what to look for — andtaking those signals seriously — is one of the most effective ways to avoidunplanned downtime, protect your equipment, and give your maintenance team thelead time they need to plan a proper upgrade rather than scrambling through anemergency one.
A fault that appears anddisappears without a clear cause is one of the most reliable early warningsigns of a failing control system component. Temperature controllers thatoccasionally read incorrectly, drives that fault and then reset, orcommunication errors that come and go are all symptoms of underlying problems —loose connections, failing components, or degraded wiring — that willeventually become permanent failures.
The dangerous thing aboutintermittent faults is that they're easy to dismiss. The line restarts, it runsfine for a shift or two, and the event gets written off as a glitch. But eachintermittent fault is the system telling you something is wrong. If you're notlogging these events and looking for patterns, you're missing critical earlywarning data.
Start logging every fault, eventhe ones that clear on their own. Note the date, time, fault description, andoperating conditions. If the same fault appears more than twice, treat it as areal problem and investigate before it becomes a permanent failure.
Temperature zones that aredifficult to tune, hunt above and below setpoint, or fail to hold steady undernormal operating conditions are a sign that something in the temperaturecontrol loop is degrading. This could be a failing solid state relay, a thermocouplethat's beginning to read inconsistently, a temperature controller that's losingcalibration, or a heater band that's starting to fail.
Temperature instability directlyaffects product quality and process consistency, but it's also a warning signfor more serious failures downstream. A solid state relay that's struggling tomodulate heat accurately today may fail in a fully closed position tomorrow —creating a runaway heat condition that's significantly more dangerous anddamaging.
If temperature zones arerequiring more attention than they used to — more frequent tuning, manualoverride interventions, or visible hunting on the trend — investigate the loopcomponents before the issue escalates. Check the SSR, the thermocouple, and thecontroller output in that order.
A single unplanned stoppage isan event. A pattern of increasing stoppages is a trend — and trends in downtimefrequency are one of the clearest signals that a control system is approachingend of life. If your maintenance team is spending more time on the same line,if the types of faults are becoming more varied, or if events that used to berare are becoming routine, the system is telling you it's running out ofrunway.
This pattern often developsgradually enough that it doesn't trigger alarm — each individual event seemsmanageable. But when you look at the annual downtime data and compare year overyear, the trend is usually clear.
Pull your downtime logs andcount unplanned events by line for the last three years. If the trend is up —especially if it's accelerating — that line is a candidate for a control systemupgrade. The upgrade conversation is much easier to have proactively thanreactively.
Control system components haveproduct lifecycles, and when a manufacturer discontinues a product, the clockstarts on your spare parts availability. Once existing stock is exhausted,you're dependent on the used and refurbished market — which is unreliable,expensive, and in some cases, nonexistent.
Facilities running DC drives,older HMI platforms, or legacy temperature controllers are particularlyvulnerable here. DC drive components are increasingly difficult to source asthe industry has largely moved to AC. Older PLC platforms may no longer havesoftware support, making programming changes impossible without legacyhardware. When a critical component fails and no replacement exists, a plannedupgrade becomes an emergency one — at dramatically higher cost.
Audit your control systemcomponents against current manufacturer product availability. For any componentthat is discontinued or approaching end of life, assess your spare partsinventory and have a transition plan ready. Don't wait for a failure to discoverthat the part you need no longer exists.
Panels that have been repeatedlypatched, modified, and repaired over the years accumulate problems. Wiringthat's been cut and spliced, components that have been replaced withnon-equivalent substitutes, and modifications that weren't properly documentedall increase the complexity and fragility of the system over time. What startedas a clean, organized panel becomes a rat's nest that nobody on the currentteam fully understands.
Beyond the troubleshootingdifficulty this creates, heavily modified panels often have compliance issues.Wiring methods that were acceptable under older codes may not meet current NECor OSHA requirements. And components that were substituted in an emergency —wrong type contactors used for heat control, SSRs installed without removingmercury relay circuit protection — may create safety hazards that aren'tvisible until something fails catastrophically.
If your maintenance team isreluctant to work in a panel because they're not sure what's in there, or iftroubleshooting requires mapping out wiring that nobody has documented, you'repast the point where incremental fixes are the right answer. A full upgrade —with new wiring, current components, and proper documentation — is almostalways less expensive in the long run than continuing to maintain a system thatnobody fully understands.
Any one of these warning signswarrants attention. Multiple warning signs appearing simultaneously on the samesystem means urgency. The cost of an emergency upgrade — with the premiumpricing, expedited shipping, and extended downtime that come with it — isalmost always significantly higher than a planned one. Every warning sign is aninvitation to plan the upgrade on your terms rather than the system's.
There's no universal answer —some systems run for years after showing early warning signs, while others failwithin weeks. The variables include the specific components involved, operatingenvironment, duty cycle, and how aggressively the early symptoms are addressed.What's consistent is that warning signs don't resolve themselves. Theunderlying issues causing intermittent faults, temperature instability, orincreasing downtime frequency will worsen over time. The question isn't whetherthe system will fail — it's whether that failure will happen on your scheduleor the system's.
For isolated failures inotherwise healthy systems, component-level repair is often appropriate. Butwhen a system is showing multiple warning signs simultaneously, or when thesame components are failing repeatedly, repair becomes an increasingly poor investment.Every repair on a degrading system buys time — but the underlying trajectorycontinues. A full upgrade resets the clock on component life, improvesdiagnostics, restores compliance, and often delivers a lower total cost ofownership within a few years.
Solid state relays,thermocouples, and DC drives are the most common failure points in agingextrusion control systems. SSRs degrade over time and fail more frequently asthey age, particularly in high-cycle applications. Thermocouples are subject todrift and physical degradation from the thermal environment they operate in. DCdrives have become increasingly difficult to maintain as parts availabilityshrinks. Beyond these, HMI screens, communication modules, and older PLCbattery-backed memory are also common failure points in systems that have beenrunning for 10 or more years.
The most effective approach is adocumented cost analysis. Calculate your average unplanned downtime cost perevent, multiply by annual event frequency, and project the trend forward basedon the deteriorating pattern you're observing. Then compare that ongoing costto the one-time upgrade investment. In most cases, the upgrade pays for itselfwithin one to two years based on downtime reduction alone — before factoring inreduced maintenance labor, improved product quality, and eliminated compliancerisk. That financial case, backed by actual data from your own operation, iswhat moves approval decisions.
In some cases, yes — but itdepends on the system architecture and the compatibility of existing componentswith modern replacements. Drive upgrades, HMI replacements, and temperaturecontroller updates can sometimes be done independently. However, piecemealupgrades on aging systems often produce integration challenges, and theresulting system may be harder to troubleshoot than either the original or afully upgraded replacement. If the control system is approaching end of lifeacross multiple components, a comprehensive upgrade typically delivers betteroutcomes at comparable cost to a series of targeted repairs.
