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Tuning and Control Loop Performance, Fourth Edition, 4th Edition by Gregory K. McMillan

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CHAPTER 11

CASCADE CONTROL

11.1INTRODUCTION

Nearly every control loop has cascade control by virtue of a valve positioner. Often there is a triple cascade as a result of the addition of a flow control loop with a remote setpoint from a composition, level, pH, or temperature controller. Cascade control is beneficial in most applications but there can be implementation problems that lead to oscillations. In most cases, there are fixes to prevent an oscillatory response but there are a few instances where a cascade loop is worse than the original single loop. This chapter will discuss how to get the most out of cascade control, benefits, and watch-outs with a special focus on how to recognize when oscillations could reduce process performance. The ...

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