🔍 Key Concepts

• Proportional-plus-reset (PI) controller: how proportional action and reset (integral) action work together • Meaning of reset rate (also called repeats per minute) in a controller • Relationship between reset (integral) action and proportional band / frequency of corrective action

💭 Think About

• Think about what the reset (integral) part of the controller does when there is a steady error. Does increasing reset rate make the controller react faster or slower to that error? • How is 'repeats per minute' related to how often the proportional action is effectively applied? • Consider whether changing the reset rate directly changes the proportional band itself, or changes how the controller responds within the existing proportional band.

✅ Before You Answer

• Verify what reset rate is usually measured in (units like repeats per minute or minutes per repeat). • Check whether proportional band is set by the proportional gain, or by the reset (integral) setting. • Confirm whether a higher reset rate makes the controller more or less aggressive in eliminating offset (steady-state error), and how that would affect stability.