American Power Conversion FM, DX manual Control Proportional Integral Derivative Method

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

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

8.Compute the PID constants using the table below. Select the type of control from the rows of the table and use the equations in the columns to compute the values for each constant.

9.Set each constant according to these calculations.

Control

Proportional

Integral

Derivative

Method

 

 

 

 

 

 

 

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

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

Loop Behavior

PID Tuning Correction

 

 

Slow response to temperature/humidity

Decrease the proportional multiplier or increase the

changes

derivative multiplier.

 

 

Over-cooling/Under-cooling after changes in

Increase the derivative or the proportional multipliers.

the room load or changes in setpoint

 

 

 

Environmental temperature/humidity never

Increase the integral setting.

reaches the setpoint

 

 

 

Over-cooling/Under-cooling on constant

Decrease the integral multiplier.

room load

 

 

 

Humidification sensitivity

Path: Main > Setup > System # > System Config > Humid. Sensitivity

Humid. Sensitivity: 2 %RH

na0434a

Humid. Sensitivity. The humidifier sensitivity band is the percentage of relative humidity below the humidify setpoint at which the humidifier operates at full output.

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 Module Modules, Systems, and GroupsSystem Group Safety symbols that may be used in this manual Symbols Used in this ManualCross-reference symbols used in this manual Lockout/tagout Electrical hazards Safety HazardsStatic discharge Safe refrigerant handling Moving parts Tools and partsDisplay Interface OperationScrolling status screens Using the Display InterfaceStatus Screen Name Status Information Displayed Main menu screen Password entryNavigating the interface Factory default settings Change settingsStart the System Stop the SystemCommissioning Power on Power On/Off ProcedurePower off Initial Inspection Checklist Commissioning ChecklistsMechanical and Refrigeration Inspection Checklist Electrical Inspection ChecklistEnsure that User Interface Box Inspection Checklist Mechanical Inspection Air-cooled ChecklistWhile the equipment is operating, ensure that Start-up Inspection ChecklistOwner Acceptance Final Inspection ChecklistSystem options System ConfigurationPage Page System delays Building management Sensor setupFluid-Coil Type Applicable Settings Settings for fluid-cooled optionsActuator types Valve typesEconomizer isolation valve optional Coil fluid temperature activation threshold and deadband Input contacts Contacts and RelaysMap Description/Function Output relays Configure Module Module ConfigurationAlarm detectors Calibrate airflow manually Module ControlCalibrate airflow automatically Reset humidifier Reset Variable Frequency DriveSet up humidifier How the modes work Control the EnvironmentPage Setpoints Deadbands Cool Deadband Compressor Allocation Return air relative humidity Essential functions ModesPID controls How to tune the PIDsControl Proportional Integral Derivative Method Loop Behavior PID Tuning CorrectionHumidification sensitivity Temperature alarms AlarmsHumidity alarms Maintenance intervalsAlarm delay Group Group configurationMode Range Share if Group settingsSystem failure events Temperature and pressure units Password and time-outDisplay Date and timeHow to update the firmware Adjust displayProduct data Reset to defaultsNetwork configuration Network ConfigurationModule status View Status ReadingsGroup status System statusView log View Event LogRespond to Alarms Displayed Alarm Message Action Required Alarm messages and suggested actionsDisplayed 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 TCP/IP configuration methods Quick ConfigurationOverview Bootp and Dhcp configuration APC Device IP Configuration WizardOption 43 = 01 04 31 41 50 43 where Remote access to the control console Choose Network from the Control Console menu Control consoleWeb interface Access a Configured UnitTelnet/SSH Snmp Recover From a Lost Password Cleanliness Monthly Preventive MaintenanceEnvironment Electrical Mechanical Record the amperages for the following components Quarterly Preventive MaintenanceFunctional tests Semi-Annual Preventive Maintenance  Measure the refrigerant pressures Problem Possible Cause Corrective Action TroubleshootingProblem Possible Cause Corrective Action Problem Possible Cause Corrective Action Problem Possible Cause Corrective Action Problem Possible Cause Corrective Action Page Terms of warranty One-Year Factory WarrantyNon-transferable warranty Exclusions Warranty claims Claims Warranty ProceduresParts Page Page 10/2007 990-3127

DX, FM specifications

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