Danfoss VLT AutomationDrive FC 360 Quick Manual

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Symptom Possible cause Test SolutionMotor is notreaching maximumspeedFrequency limits are set incorrectlyCheck output limits inparameter 4-14 Motor Speed High Limit[Hz] and parameter 4-19 Max OutputFrequencyProgram correct limits.Reference input signal not scaledcorrectlyCheck reference input signal scaling in6-** Analog I/O mode and parametergroup 3-1* References.Program correct settings.Motor speed isunstable Possible incorrect parameter settingsCheck the settings of all motorparameters, including all motorcompensation settings. For closed-loop operation, check PID settings.Check settings in parameter group 6-** Analog I/O mode.Motor runs roughly Possible overmagnetisation Check for incorrect motor settings inall motor parameters.Check motor settings in parametergroups 1-2* Motor data, 1-3* Advmotor data, and 1-5* Load indep.setting.Motor does notbrakePossible incorrect settings in thebrake parameters. Possible too shortramp-down times.Check brake parameters. Check ramptime settings.Check parameter group 2-0* DC brakeand 3-0* Reference limits.Open power fusesor circuit breakertripPhase-to-phase shortMotor or panel has a short phase-to-phase. Check motor and panel phasefor shorts.Eliminate any shorts detected.Motor overload Motor is overloaded for theapplication.Perform the start-up test and verifythat motor current is within specifi-cations. If motor current is exceedingnameplate full load current, themotor may run only with reducedload. Review the specifications for theapplication.Loose connections Perform pre-startup check for looseconnections. Tighten loose connections.Mains currentimbalance greaterthan 3%Problem with mains power (SeeAlarm 4 Mains phase loss description)Rotate input power leads into thefrequency converter 1 position: A to B,B to C, C to A.If the imbalanced leg follows thewire, it is a power problem. Checkmains supply.Problem with the frequencyconverter unitRotate input power leads into thefrequency converter 1 position: A to B,B to C, C to A.If the imbalanced leg stays on sameinput terminal, it is a problem withthe unit. Contact the supplier.Motor currentimbalance greaterthan 3%Problem with motor or motor wiring Rotate output motor leads 1 position:U to V, V to W, W to U.If the imbalanced leg follows thewire, the problem is in the motor ormotor wiring. Check motor andmotor wiring.Problem with the frequencyconverter unitRotate output motor leads 1 position:U to V, V to W, W to U.If the imbalanced leg stays on sameoutput terminal, it is a problem withthe unit. Contact the supplier.Acoustic noise orvibration (forexample, a fanblade is makingnoise or vibrationsat certainfrequencies)Resonances, for example, in themotor/fan systemBypass critical frequencies by usingparameters in parameter group 4-6*Speed Bypass. Check if noise and/or vibration havebeen reduced to an acceptable limit.Turn off overmodulation inparameter 14-03 Overmodulation.Increase resonance damping inparameter 1-64 Resonance Dampening.Table 7.3 TroubleshootingDiagnostics and Troubleshoo... Quick GuideMG06A602 Danfoss A/S © 04/2015 All rights reserved. 477 7