Danfoss VLT FC 103 Operating Instructions Manual

Also see for VLT FC 103: Service guide Installation guide Installation guide Operating guide Installation guide

Contents

Danfoss VLT FC 103 Operating Instructions Manual Manual pdf 68 page image

SSymptom Possible cause Test SolutionMotor running in wrongdirectionMotor rotation limit Check that 4-10 Motor SpeedDirection is programmed correctly.Program correct settingsActive reversing signal Check if a reversing command isprogrammed for the terminal inparameter group 5-1* Digitalinputs..Deactivate reversing signalWrong motor phase connection See 2.4.5 Motor Rotation Check inthis manualMotor is not reachingmaximum speedFrequency limits set wrong Check output limits in 4-13 MotorSpeed High Limit [RPM], 4-14 MotorSpeed High Limit [Hz] and 4-19 MaxOutput Frequency.Program correct limitsReference input signal not scaledcorrectlyCheck reference input signalscaling in 6-0* Analog I/O Mode andparameter group 3-1* References.Reference limits in parametergroup 3-0* Reference Limit.Program correct settingsMotor speed unstablePossible incorrect parametersettingsCheck the settings of all motorparameters, including all motorcompensation settings. For closedloop operation, check PID settings.Check settings in parameter group1-6* Analog I/O mode. For closedloop operation, check settings inparameter group 20-0* Feedback..Motor runs roughPossible over-magnetization Check for incorrect motor settingsin all motor parametersCheck motor settings in parametergroups 1-2* Motor Data, 1-3* AdvMotor Data, and 1-5* Load Indep.Setting.Motor will not brakePossible incorrect settings in thebrake parameters. Possible tooshort ramp down timesCheck brake parameters. Checkramp time settingsCheck parameter group 2-0* DCBrake and 3-0* Reference Limits.Open power fuses or circuitbreaker tripPhase to phase short Motor or panel has a short phaseto phase. Check motor and panelphase for shortsEliminate any shorts detectedMotor overload Motor is overloaded for theapplicationPerform startup test and verifymotor current is within specifi-cations. If motor current isexceeding nameplate full loadcurrent, motor may run only withreduced load. Review the specifi-cations for the application.Loose connections Perform pre-startup check for looseconnectionsTighten loose connectionsMains current imbalancegreater than 3%Problem with mains power (SeeAlarm 4 Mains phase lossdescription)Rotate input power leads into thefrequency converter one position: Ato B, B to C, C to A.If imbalanced leg follows the wire,it is a power problem. Check mainspower supply.Problem with the frequencyconverterRotate input power leads into thefrequency converter one position: Ato B, B to C, C to A.If imbalance leg stays on sameinput terminal, it is a problem withthe unit. Contact the supplier.Motor current imbalancegreater than 3%Problem with motor or motorwiringRotate output motor leads oneposition: U to V, V to W, W to U.If imbalanced leg follows the wire,the problem is in the motor ormotor wiring. Check motor andmotor wiring.Problem with the frequencyconvertersRotate output motor leads oneposition: U to V, V to W, W to U.If imbalance leg stays on sameoutput terminal, it is a problemwith the unit. Contact the supplier.Basic Troubleshooting VLTp Refrigeration Drive Operating Instructions64 MG16J102 - VLTp is a registered Danfoss trademark99inverter.ru (812) 702-47-50