American Power Conversion DX, FM manual PID controls, How to tune the PIDs

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PID controls

Path: Main > Setup > System # > System Config > PID Controls

The Proportional plus Integral plus Derivative (PID) loop is used to control the output of the LiquidCool, reheat, and dehumidify modes.

01of03:LiquidCool Mode: Prop+Int+Der P: 020 %/°

I:000 %/°*min

D:000 %/°/min

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Choose which mode or actuator PID loop to tune, using the 01of03: [Mode/Actuator name] setting.

Model. Choose the multipliers to use in the PID algorithm. You can omit the derivative or the integral and derivative multipliers in the algorithm.

Note: Controllers that use temperature as the process variable calculate the process error in units of Centigrade.

P. The proportional multiplier (gain) for this mode or actuator. The proportional multiplier adjusts for the difference (error) between the measurement (temperature or humidity) and the setpoint. The proportional multiplier is expressed in percent of output per unit of error.

I. The integral multiplier (reset rate) for this mode or actuator. The integral multiplier adjusts for error measurement and the amount of time that the error has existed. The integral multiplier adds to or subtracts from the output in small increments to correct for the offset error caused by the proportional contribution. It is expressed in percent of output for each minute and unit of error (error multiplied by minutes).

D. The derivative multiplier (derivative) for this mode or actuator. The derivative multiplier adjusts the output for rapid changes in the error, correcting for the rate of change of the error over time. It is expressed in percent of output for each unit of error per minute (error divided by minutes).

How to tune the PIDs

A qualified service technician must tune the PID loops to optimize the performance of each mode. The units shown are for temperature. In the dehumidify loop, the units are in percent relative humidity (%RH).

Caution: The PID loops must be tuned after the equipment in the room is installed and running. The loops should be tuned periodically to account for changes in the room load.

1.Select the PID loop to tune.

2.Adjust the integral and derivative constants to zero and the proportional constant to twenty.

3.Set the temperature (cool or reheat) setpoint value and start the System.

4.When the temperature reaches a stable value, increase the proportional constant by 10. If the temperature does not respond to this change, adjust the setpoint.

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

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NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting

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Contents Operation, Maintenance, and Troubleshooting Page American Power Conversion Legal Disclaimer Page Contents Commissioning Checklists Alarms Network Management Card Troubleshooting Warranty Page Modules, Systems, and Groups ModuleSystem Group Symbols Used in this Manual Safety symbols that may be used in this manualCross-reference symbols used in this manual Safety Hazards Lockout/tagout Electrical hazardsStatic discharge Safe refrigerant handling Moving parts Tools and partsOperation Display InterfaceUsing the Display Interface Scrolling status screensStatus Screen Name Status Information Displayed Password entry Main menu screenNavigating the interface Change settings Factory default settingsStart the System Stop the SystemCommissioning Power On/Off Procedure Power onPower off Commissioning Checklists Initial Inspection ChecklistElectrical Inspection Checklist Mechanical and Refrigeration Inspection ChecklistEnsure that Mechanical Inspection Air-cooled Checklist User Interface Box Inspection ChecklistStart-up Inspection Checklist While the equipment is operating, ensure thatFinal Inspection Checklist Owner AcceptanceSystem Configuration System optionsPage Page System delays Sensor setup Building managementSettings for fluid-cooled options Fluid-Coil Type Applicable SettingsValve types Actuator typesEconomizer isolation valve optional Coil fluid temperature activation threshold and deadband Contacts and Relays Input contactsMap Description/Function Output relays Module Configuration Configure ModuleAlarm detectors Module Control Calibrate airflow manuallyCalibrate airflow automatically Reset Variable Frequency Drive Reset humidifierSet up humidifier Control the Environment How the modes workPage Setpoints Deadbands Cool Deadband Compressor Allocation Return air relative humidity Modes Essential functionsHow to tune the PIDs PID controlsLoop Behavior PID Tuning Correction Control Proportional Integral Derivative MethodHumidification sensitivity Alarms Temperature alarmsHumidity alarms Maintenance intervalsAlarm delay Group configuration GroupGroup settings Mode Range Share ifSystem failure events Password and time-out Temperature and pressure unitsDisplay Date and timeAdjust display How to update the firmwareReset to defaults Product dataNetwork Configuration Network configurationView Status Readings Module statusSystem status Group statusView Event Log View logRespond to Alarms Alarm messages and suggested actions Displayed Alarm Message Action RequiredDisplayed Alarm Message Action Required Path Main Setup System # System Config Valve Types Check that the # Systems setting Path Main Setup Group Group Module Module Alarm Occurred in Module Control Reset Comm Lost state, or Off Displayed Alarm Message Action Required Displayed Alarm Message Action Required Quick Configuration TCP/IP configuration methodsOverview APC Device IP Configuration Wizard Bootp and Dhcp configurationOption 43 = 01 04 31 41 50 43 where Remote access to the control console Control console Choose Network from the Control Console menuAccess a Configured Unit Web interfaceTelnet/SSH Snmp Recover From a Lost Password Monthly Preventive Maintenance CleanlinessEnvironment Mechanical ElectricalQuarterly Preventive Maintenance  Record the amperages for the following componentsFunctional tests Semi-Annual Preventive Maintenance  Measure the refrigerant pressures Troubleshooting Problem Possible Cause Corrective ActionProblem Possible Cause Corrective Action Problem Possible Cause Corrective Action Problem Possible Cause Corrective Action Problem Possible Cause Corrective Action Page One-Year Factory Warranty Terms of warrantyNon-transferable warranty Exclusions Warranty claims Warranty Procedures ClaimsParts Page Page 990-3127 10/2007

DX, FM specifications

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In summary, the American Power Conversion DX,FM series incorporates modularity, advanced battery technology, effective cooling solutions, and sophisticated monitoring features to deliver an ideal power management solution for various organizations. Its design prioritizes flexibility, reliability, and efficiency, making it an essential investment for any business looking to safeguard its operations against power disruptions.
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