Liebert 3000 Control Types, Humidification Operation System Activation, Proportional Control

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System Performance with Advanced Microprocessor Controls

4.2.4Humidification Operation System Activation

The humidifier (infrared or steam) is activated when the humidity control calculates a requirement of 100% humidification, and deactivated when the requirement falls below 50%.

4.3Control Types

4.3.1Proportional Control

This is a standard control method that maintains the room at a temperature proportional to the load. The temperature maintained increases as the room load increases. At full load the room would be con- trolled at a temperature equal to the temperature setpoint plus the temperature sensitivity. If propor- tional control is selected, the gain is factory set and cannot be adjusted by the user. Operator inputs are the usual setpoint and sensitivity adjustments.

4.3.2PID Control (Chilled Water or SCR Reheats only)

The PID control combines three individual terms to determine the control output for a given set of conditions. Note that PID control is used only for temperature. If PID control is selected, humidity will continue to use proportional control.

The proportional (P term) is determined by the difference between the current temperature and the control setpoint. This term is expressed in % cooling (heating) desired for each degree above (below) the setpoint. It is adjustable from 0% to 100% per degree. The purpose of this term is to adjust the control output for any deviation between the current temperature and the control setpoint.

The integral (I term) is determined by two things: the difference between the temperature and control setpoint and the amount of time this difference has existed. This term is expressed in % cooling (heat- ing) desired for each minute and degree above (below) the setpoint. It is adjustable from 0% to 100% per degree-minute. The purpose of this term is to force the control to maintain the temperature around the setpoint by slowly but continuously adding (subtracting) a small amount of cooling (heat- ing) to the total control output until the temperature is at the setpoint.

The derivative (D term) is determined by the rate of change of temperature. This term is expressed in

%cooling (heating) desired for each degree per minute rise (fall) in temperature. It is adjustable from 0% to 100% per degree/min. The purpose of this term is to adjust the control output for quickly chang- ing temperatures, thus providing an anticipation control.

All three terms are adjusted through the “select control type” menu. If PID control is selected, the temperature sensitivity setting is not used by the control.

For optimum performance, a PID control must be adjusted or tuned according to the characteristics of the particular space and load to be controlled. Improper tuning can cause the control to exhibit poor response and/or hunting. The characteristics of the space and load may change seasonally, so occa- sional retuning is required for optimum performance.

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Contents Liebert Challenger Page Table of Contents Run Diagnostics Alarm Descriptions Component Operation and MaintenanceHumidifier Figures Page System Descriptions Compressorized SystemsGlycool Chilled Glycol Cooling Systems Chilled Water SystemsStart-Up Procedure Basics Advanced microprocessor control panelAdvanced microprocessor a control for Challenger Status Display Status/Alarm DataMain Menu MENU/ESC Setpoints/Setup Default setpoints and rangesRun Hours Log Analog SensorsSetup System Setup OperationSelect Options Show DIP SwitchesCalibrate Sensors Setup Alarms Alarm default time delaysDefault Time Alarm Delay secondsStandard Custom Alarm Messages Humidity HUM Control MethodSet Status Display Analog SetupCalibrate Actuator Run Diagnostics Show InputsTest Outputs Test Control BoardChange Passwords Date and TimeControl Circuit Board LCD Display ContrastDIP Switches Non-Volatile MemoryControl Outputs Control output LEDsOperation with Advanced Microprocessor with Graphics Control Advanced microprocessor with graphics control menu View/Set Alarms See 3.7.7 Set Status DisplaySetup Alarms Setup Water Detect Floor Plan Setup Custom AlarmsView Water Detect Floor Plan for Optional LTM1000/LT750 System Setup Cold Start DelayOperating Status View/Set Control SetpointsAuto Restart Delay Default Settings and RangesIR Flush Overfill infrared humidifiers only Chilled Water/Hot Water/Econ-O-Coil FlushCalibrate Valve Actuator Select Control Algorithm Chilled Water and SCR Reheats onlyRun Diagnostics Select Humidity Sensing ModeShow Inputs Plot Graphs Setting optionsModify Plot Scales Analog/Digital Inputs View Run Hours LogView Total Run Hours View 24 Hour Run Time HistoryLCD Contrast Nonvolatile Memory Temperature Control Cooling/Heating Required, in Percent %Response to Control Types Proportional Control PID Control Chilled Water or SCR Reheats onlyGlycool Cooling Dual Cooling SourceChilled Water Cooling Cooling/dehumidification load status responseHumidity Control Heating Operation Electric ReheatHot Water Reheat SCR Electric Reheat Requires Special Control SoftwareHumidification Operation System Activation Control TypesProportional Control Time between peaks x 5% Load Control Features Additional FeaturesConnecting the Analog Sensors Short Cycle ControlInstallation-LT750 DIP Switch Settings FaultWater Detection Display LT750 Environmental UnitPhysical Connections SetupCalibration Communications Liebert Monitoring Devices and SoftwareStandard Alarms Change FilterCustom Alarms High TemperatureCompressor Overload High Head PressureHigh Temperature and Low Temperature Simultaneously Humidifier Problem Infrared HumidifiersLoss of Power Low TemperatureOptional/Custom Alarms System Testing Firestat Smoke DetectorWater Detection Sensor Liebert unit Recommended Liquitect location Floor drainZone leak detection kit installation scenarios FiltersRemote Shutdown Distance From UnitBlower Package Fan Impellers and BearingsBelt Air DistributionRefrigeration System Suction PressureDischarge Pressure SuperheatThermostatic Expansion Valve Operation AdjustmentHot Gas Bypass Valve Operation Outdoor fan/condenser configuration Air Cooled CondenserRegulating Valve Water/Glycol Cooled Condensers Coaxial CondenserValve spring guide Glycol Solution Maintenance Adjusting Collar NutCompressor Functional Check Compressor ReplacementMechanical Failure Compressor Replacement Procedure Electrical FailureCleaning the Pan HumidifierInfrared Humidifier Removing the PanAutoflush Infrared Humidifier Cleaning System Autoflush OperationAutoflush Controls Steam Generating HumidifierOperation ControlsReplacing the Canister Humidifier canister part numbersPart Capacity Number Voltage Lbs/hr kg/hr 200-460Circuit Board Adjustments Drain Tempering FeatureChilled water troubleshooting Blower troubleshootingSymptom Possible Cause Check or Remedy Compressor and refrigeration system troubleshooting Compressor and refrigeration system troubleshooting Dehumidification troubleshooting Glycol pump troubleshootingInfrared humidifier troubleshooting See 6.4.8 Compressor Functional Check and TableSteam generating humidifier troubleshooting Reheat troubleshooting Filters Steam Generating Humidifier Blower SectionCompressor Air Cooled Condenser if applicableFilters Water/Glycol Condenser if applicableGlycol Pump Electrical PanelSemiannual Maintenance Inspection Checklist Page Ne t ItiTi n That
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3000 specifications

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