User ManualTable of ContentsContents4Overview of PID control6What PID loops do6How PID loops work7PID calculations8Proportional calculation8Integral calculation9Derivative calculation10Velocity model12PID settings14Throttling range14Gains15Calculating the gains16Sampling frequency17Calculating the sampling frequency19Action22Direct action22Reverse action22Determining the action23Error deadband24Typical applications24Adjusting error deadband for modulating outputs25Adjusting error deadband for staged outputs25Other PID settings26Programming PID loops28Programming in PCL28Programming in TGP31Applications34Discharge-air temperature control34Building pressure control37Cascade control—first stage39Staging cooling-tower fans42Setting up the PID loop42Determining the staging points47Troubleshooting50Troubleshooting procedure50Tips for specific problems51Changing the sampling frequency51Changing the gains51Examples52Frequently asked questions56The math behind PID loops60Velocity model formula60Proportional control formula60Glossary62Index66Size: 892 KBPages: 70Language: EnglishOpen manual
User ManualTable of ContentsContents4Overview of PID control6What PID loops do6How PID loops work7PID calculations8Proportional calculation8Integral calculation9Derivative calculation10Velocity model12PID settings14Throttling range14Gains15Calculating the gains16Sampling frequency17Calculating the sampling frequency19Action22Direct action22Reverse action22Determining the action23Error deadband24Typical applications24Adjusting error deadband for modulating outputs25Adjusting error deadband for staged outputs25Other PID settings26Programming PID loops28Programming in PCL28Programming in TGP31Applications34Discharge-air temperature control34Building pressure control37Cascade control—first stage39Staging cooling-tower fans42Setting up the PID loop42Determining the staging points47Troubleshooting50Troubleshooting procedure50Tips for specific problems51Changing the sampling frequency51Changing the gains51Examples52Frequently asked questions56The math behind PID loops60Velocity model formula60Proportional control formula60Glossary62Index66Size: 892 KBPages: 70Language: EnglishOpen manual
