Author: PLC Play Ground
PID Output Stuck at 100%? The Integral May Be Hiding the Real Problem
A PID output at its limit does not prove the tuning is weak.
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Temperature Runs Away After Enabling PID? Check the Control Direction
A loop that drives farther from setpoint may have the wrong control direction.
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PID Looks Badly Tuned? Check Whether SP and PV Use the Same Scale
A PID cannot interpret a setpoint in degrees correctly when its process input represents percent.
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PID Output Spikes When the Setpoint Changes? Check Derivative Kick
A sharp output spike exactly when setpoint changes can come from derivative acting on error.
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A Tiny Sensor Ripple Is Shaking the Valve? Check the Derivative Term
A small measurement ripple can create a large derivative contribution.
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Your PID Runs Every Scan—but Is Its Time Setting Telling the Truth?
PID timing errors can make unchanged gains behave differently after a task change.
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PID Says 80%, but the Valve Crawls Behind It? Check Output Tracking
A downstream rate limiter can make the actuator lag behind the PID request.
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Heating and Cooling Fight Near Setpoint? Inspect the Split-Range Crossover
Oscillation near a heating-to-cooling crossover may come from split-range behavior.
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Two PID Loops Keep Fighting? Check the Inner Loop First
Cascade control depends on a useful inner loop.
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PID Keeps Overcorrecting Before Anything Happens? Measure Dead Time
A controller can overreact while waiting for a delayed process response.
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