Excellent PLC
Author: Jake Thompson – Wind Farm Automation Engineer & Tech Blogger
So last month, I got called out to a wind farm where one of the Bently Nevada 131170-01 dynamic data cables was acting… let’s say, “temperamental.” Basically, the vibration readings from a nacelle accelerometer kept dropping out randomly. Operators were scratching their heads while the turbine kept spinning happily.
Here’s what went down.
The Symptoms
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Signals would drop intermittently, usually during high wind gusts
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Sometimes the channel would show zero for 3–5 seconds
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All other channels on the same 3500 rack were fine
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Cables looked intact at first glance
Initial Diagnosis
I suspected:
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Sensor probe issue
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Module failure
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EMI from the turbine’s power electronics
But all sensors and modules tested fine. The pattern correlated with turbine vibration, pointing toward mechanical stress on the cable.
Root Cause
After removing the cable and inspecting it carefully:
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Minor abrasions along the jacket where the cable flexed near the cable entry point
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Braided shield slightly frayed
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Vibration-induced micro-bends caused intermittent signal dropouts
Basically, the turbine’s constant oscillation slowly wore the cable down—like a toothbrush over time, just more expensive.
Fix & Mitigation
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Cable Replacement: Installed a new 131170-01 with careful routing
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Strain Relief Loops: Prevented sharp bends near connection points
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Vibration Isolation: Added small cable clamps to minimize movement
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Routing Away from High Vibration Zones: Whenever possible, cable runs were adjusted
After this, the signals stabilized completely, even during gusty conditions.
Takeaways
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Dynamic data cables are surprisingly sensitive to mechanical stress.
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Regular inspection for abrasions or jacket wear can prevent unexpected signal losses.
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Proper routing and strain relief in vibration-heavy environments are essential.
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Even the best cables need a little love to survive real-world industrial conditions.
Honestly, the 131170-01 is a robust cable, but if you ignore vibration and routing, it’ll bite you eventually. Learned it the hard way here—but the operators are happy now, and I got another blog story.
— Jake