Schneider Electric ACRC502 Tune the PID loop, Control Method Proportional Integral Derivative

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Tune the PID loop

Tune the PID loop to optimize the performance of the cooling group.

NOTE: This procedure is to be performed by Schneider Electric authorized personnel only. The PID loop must be tuned after the equipment in the room is installed and running. The loop should be tuned periodically to account for changes in the room load.

1.Adjust the integral and derivative constants to zero and the proportional constant to 1.0.

2.Set the temperature setpoint value and start the cooling group.

3.When the temperature reaches a stable value, increase the proportional constant by 0.5. If the temperature does not respond to this change, adjust the setpoint.

4.Repeat step 3 until the temperature value starts to oscillate and the peak amplitude of the oscillations is constant.

5.Note the time, in minutes, between the peaks of the oscillations. This is the Ultimate Period, PU.

6.Note the value of the proportional constant. This is the Ultimate Gain, GU.

7.Compute the PID constants using the table below. Use the equations for that control method in the row to compute the values for each constant.

Control Method

Proportional

Integral

Derivative

 

 

 

 

P

0.5*GU

–

–

P + I

0.45*GU

0.54*GU/PU

–

P + I + D

0.6*GU

1.2*GU/PU

0.075*GU*PU

8. Set each constant according to these calculations.

You may need to further tune the PID loop in the following ways to account for changes in the room load:

Loop Behavior

PID Tuning Correction

 

 

Slow response to temperature changes

Increase the proportional multiplier or increase the

 

derivative multiplier.

Overcooling/undercooling after changes in the room

Increase the derivative or the proportional multiplier.

load or changes in setpoint

 

 

 

Environmental temperature never reaches the

Increase the integral multiplier.

setpoint

 

 

 

Overcooling/undercooling on constant room load

Decrease the integral multiplier.

 

 

InRow RC Operation and Maintenance Manual

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Contents 990-3237B-001 Publication Date November Operation and Maintenance ManualSchneider Electric IT Corporation Legal Disclaimer Table of Contents Network Management Card Troubleshooting Page General Information Important Safety InformationHazard of Electric SHOCK, EXPLOSION, or ARC Flash Safety Notices During OperationStatic Electricity Hazard Initial inspection checklist ChecklistsCommissioning Ensure thatElectrical Hazard Electrical inspection checklistPiping Installation Mechanical inspection checklistStart-up inspection checklist User interface inspection checklistFinal inspection checklist While the equipment is operating, ensure thatDisplay Interface OperationDescription Function Scrolling status screens Using the DisplayMain menu screens Navigating the main menuPath Main Set Password Change Passwords Using the Path statementNavigating sub-menus Path Main Operation Limit Access Password entryStart the cooling unit Path Main On/StandbyStandby Option Stop the cooling unitCooling unit configuration General ConfigurationPath Main Configure Unit General Path Main Configure Unit Discrete I/O Normal State Path Main Configure Unit Discrete I/OContacts View the state of input and output contactsConfigure the cooling group Cooling Group ConfigurationPath Main Configure Group Path Main Configure Modbus Configure ModbusIdentify the cooling unit Path Main Set IdentificationControl the Environment How the Cool mode worksSetpoints Path Main Set Group SetpointsPath Main Set Group PIDs PID settingsTune the PID loop Loop Behavior PID Tuning CorrectionControl Method Proportional Integral Derivative Run hours Service intervalsThresholds Password & timeout Display SettingsAdjust display Date & timePath Main Menu Set Display Units Display unitsConfigure the network Network ConfigurationPath Main Configure Network Cooling unit status View Status ReadingsPath Main View Unit Status About the cooling unit Cooling group statusPath Main View Group Status Path Main About InRow RCView event log Event LogClear event log Path Main View Event LogView active alarms Respond to AlarmsClear active alarms Alarm messages and suggested actionsThreshlds screen Configure Unit General Role Override Auto and that coolingAlarm Message Severity Action Required TCP/IP configuration methods Quick ConfigurationSchneider Electric Device IP Configuration Wizard Network Management CardIni file utility Bootp & Dhcp configuration Remote access to the control console Local access to the control consoleNetwork TCP/IP Boot Mode Dhcp only Advanced Dhcp Cookie Is Choose Network from the Control Console menu Control consoleWeb interface Access a Configured Network Management CardTelnet and SSH Modbus Simple Network Management Protocol SnmpInRow RC Operation and Maintenance Manual Recover From a Lost Password Monthly Preventive Maintenance MaintenanceCleanliness EnvironmentElectrical MechanicalFunctional Semi-Annual Preventive MaintenanceProblem Possible Cause Corrective Action TroubleshootingProblem Possible Cause Corrective Action Page Page Worldwide Customer Support

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