Five Signs Heat Is Affecting Your Industrial Electronics
Summer does not usually create electronic problems. It exposes the ones that were already there.
When temperatures climb, industrial electronics operate with less margin for error.
Control cabinets run hotter. Cooling systems work harder. Components that have been aging for years may begin showing symptoms they were able to hide during cooler weather.
If you have noticed any of the signs below, heat may be telling you it is time to take a closer look.
1. The Cooling Fan Never Seems to Stop
Cooling fans are designed to move heat away from critical components.
During the summer, it is normal for them to run more often. But if a cabinet fan seems to be running constantly, or sounds louder than it used to, it may be compensating for more than warm weather.
Dust build-up, clogged filters, restricted airflow, failing bearings, and/or aging power electronics can all force cooling systems to work overtime.
Sometimes the hardest-working component in the cabinet is the fan.
2. Intermittent Faults That Disappear on Their Own
Intermittent problems are among the most frustrating to troubleshoot.
- A drive faults once.
- A PLC loses communication for a moment.
- An HMI freezes briefly.
Then everything works normally again.
Heat often affects components that are already operating near their limits. As temperatures rise, electrical characteristics can change just enough to trigger a fault. When temperatures drop, the problem may disappear until the next hot day.
If a problem seems difficult to reproduce, temperature may be part of the story.
3. Random Resets or Unexpected Reboots
A system that unexpectedly restarts is rarely doing so without a reason.
Power supplies with aging capacitors, marginal voltage regulation, or overheating components may reset under higher temperatures or heavier electrical loads.
The equipment may not have failed completely; t may simply be running out of performance margin.
4. Displays That Fade or Become Difficult to Read
Operators often notice this one first.
LCD displays, HMIs, and operator panels can become dimmer, slower to respond, or more difficult to read as temperatures increase.
Some display changes may be temporary, but they can also indicate aging backlights, deteriorating display electronics, or components approaching the end of their service life.
If the screen looks better after cooling down, it is worth paying attention.
5. It Works Again After It Cools Down
This may be the clearest warning sign of all.
If equipment runs normally first thing in the morning but begins acting up later in the day, temperature may be a factor.
The same is true if a drive faults during the afternoon but works again the next morning, or if opening the cabinet door seems to improve performance.
Heat is not always the root cause. It may be revealing a weakness that already exists.
Heat Does Not Cause Every Failure
A new power supply may tolerate 120°F inside a control cabinet.
A 20-year-old power supply with aging capacitors may not.
The weather did not change the equipment's design. It changed how much performance margin remained.
Summer has a way of exposing problems that cooler weather lets slide.
Do Not Wait for Cooler Weather
If your drives, HMIs, PLCs, power supplies, ultrasonic generators, or other industrial electronics are showing any of these symptoms, now is a good time to have them evaluated.
Many issues can be identified and repaired before they become unexpected downtime.
Control System Labs Can Help
For more than 55 years, Control System Labs has helped manufacturers diagnose, evaluate, and repair industrial electronics from virtually every major manufacturer.
Whether you are seeing intermittent faults, unexplained resets, overheating, or simply want to evaluate aging equipment, our technicians can help determine what is happening and recommend the most practical next step.