Danfoss VLT Series Programming Manual

Also see for VLT series: Service manual Installation guide Operating instructions Operating instructions Service manual

Contents

Danfoss VLT Series Programming Manual Manual pdf 37 page image

3.3 Main Menu - Load and Motor - Group 13.3.1 1-0* General SettingsDefine whether the frequency converter operates in openloop or closed loop.1-00 Configuration ModeOption: Function:[0] * OpenLoopMotor speed is determined by applying a speedreference or by setting desired speed when inHand Mode.Open Loop is also used if the frequencyconverter is part of a closed loop control systembased on an external PID controller providing aspeed reference signal as output.[3] ClosedLoopMotor Speed will be determined by a referencefrom the built-in PID controller varying themotor speed as part of a closed loop controlprocess (e.g. constant pressure or flow). The PIDcontroller must be configured in parametergroup 20-** or via the Function Setups accessedby pressing the [Quick Menus] button.NOTEThis parameter cannot be changed while the motor isrunning.NOTEWhen set for Closed Loop, the commands Reversing andStart Reversing will not reverse the direction of the motor.1-03 Torque CharacteristicsOption: Function:[0]*CompressortorqueCompressor [0]: For speed control of screwand scroll compressors. Provides a voltagewhich is optimized for a constant torque loadcharacteristic of the motor in the entire rangedown to 10 Hz.[1] VariabletorqueVariable Torque [1]: For speed control ofcentrifugal pumps and fans. Also to be usedwhen controlling more than one motor fromthe same frequency converter (e.g. multiplecondenser fans or cooling tower fans).Provides a voltage which is optimized for asquared torque load characteristic of themotor.[2] Auto EnergyOptim. CTAuto Energy Optimization Compressor [2]: Foroptimum energy efficient speed control ofscrew and scroll compressors. Provides avoltage which is optimized for a constanttorque load characteristic of the motor in theentire range down to 15Hz but in additionthe AEO feature will adapt the voltageexactly to the current load situation, thereby1-03 Torque CharacteristicsOption: Function:reducing energy consumption and audiblenoise from the motor. To obtain optimalperformance, the motor power factor cos phimust be set correctly. This value is set in14-43 Motor Cosphi. The parameter has adefault value which is automatically adjustedwhen the motor data is programmed. Thesesettings will typically ensure optimum motorvoltage but if the motor power factor cos phirequires tuning, an AMA function can becarried out using 1-29 Automatic MotorAdaptation (AMA). It is very rarely necessaryto adjust the motor power factor parametermanually.[3]*Auto EnergyOptim. VTAuto Energy Optimization VT [3]: For optimumenergy efficient speed control of centrifugalpumps and fans. Provides a voltage which isoptimized for a squared torque load charac-teristic of the motor but in addition the AEOfeature will adapt the voltage exactly to thecurrent load situation, thereby reducingenergy consumption and audible noise fromthe motor. To obtain optimal performance,the motor power factor cos phi must be setcorrectly. This value is set in 14-43 MotorCosphi. The parameter has a default valueand is automatically adjusted when themotor data is programmed. These settingswill typically ensure optimum motor voltagebut if the motor power factor cos phirequires tuning, an AMA function can becarried out using 1-29 Automatic MotorAdaptation (AMA). It is very rarely necessaryto adjust the motor power factor parametermanually.NOTE1-03 Torque Characteristics will not have effect when1-10 Motor Construction = [1] PM, non salient SPM.NOTEFor pumps or fan applications where the viscosity ordensity can vary significantly or where excessive flow e.g.due pipe breakage, can occur, it is recommended to selectAuto Energy Optim. CTParameter Description VLT® HVAC Drive Programming Guide36 MG.11.CC.02 - VLT® is a registered Danfoss trademark33