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Temperature Controller: Overshoot or Undershoot

FAQ No. FAQ02697

Primary Contents

Question

Why does E5[]N Basic-type Digital Temperature Controllers overshoot or undershoot?

Answer

The proportional band is too narrow and the P constant is too small.

The integral time is too short and the I constant is too small.

The derivative time is too long and the D constant is too large.

It is in ON/OFF control mode.

The control cycle is too long for a control system with fast thermal response.

The overlap band setting is mistakenly set for a dead band setting in heating and cooling control.

Applicable models: E5CN, E5GN, E5EN, and E5AN