Danfoss VLT FC 102 Series Design Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

Contents

The warning/alarm information below defines eachwarning/alarm condition, provides the probable cause forthe condition, and details a remedy or troubleshootingprocedure.WARNING 1, 10 Volts lowThe control card voltage is below 10 V from terminal 50.Remove some of the load from terminal 50, as the 10 Vsupply is overloaded. Max. 15 mA or minimum 590 Ω.A short circuit in a connected potentiometer or improperwiring of the potentiometer can cause this condition.TroubleshootingRemove the wiring from terminal 50. If thewarning clears, the problem is with the wiring. Ifthe warning does not clear, replace the controlcard.WARNING/ALARM 2, Live zero errorThis warning or alarm only appears if programmed in6-01 Live Zero Timeout Function. The signal on one of theanalog inputs is less than 50% of the minimum valueprogrammed for that input. Broken wiring or faulty devicesending the signal can cause this condition.TroubleshootingCheck connections on all the analog inputterminals. Control card terminals 53 and 54 forsignals, terminal 55 common. MCB 101 terminals11 and 12 for signals, terminal 10 common. MCB109 terminals 1, 3, 5 for signals, terminals 2, 4, 6common).Check that the frequency converter programmingand switch settings match the analog signal type.Perform Input Terminal Signal Test.WARNING/ALARM 4, Line phase lossA phase is missing on the supply side, or the line voltageimbalance is too high. This message also appears for afault in the input rectifier on the adjustable frequencydrive. Options are programmed at 14-12 Function at MainsImbalance.TroubleshootingCheck the supply voltage and supply currents tothe adjustable frequency drive.WARNING 5, DC link voltage highThe intermediate circuit voltage (DC) is higher than thehigh-voltage warning limit. The limit is dependent on theadjustable frequency drive voltage rating. The unit is stillactive.WARNING 6, DC link voltage lowThe intermediate circuit voltage (DC) is lower than the low-voltage warning limit. The limit is dependent on thefrequency converter voltage rating. The unit is still active.WARNING/ALARM 7, DC overvoltageIf the intermediate circuit voltage exceeds the limit, theadjustable frequency drive trips after a time.TroubleshootingConnect a brake resistorExtend the ramp timeChange the ramp typeActivate the functions in 2-10 Brake FunctionIncrease 14-26 Trip Delay at Inverter FaultIf the alarm/warning occurs during a power sag,use kinetic backup (14-10 Line Failure)WARNING/ALARM 8, DC undervoltageIf the DC link voltage drops below the undervoltage limit,the adjustable frequency drive checks if a 24 V DC backupsupply is connected. If no 24 V DC backup supply isconnected, the adjustable frequency drive trips after afixed time delay. The time delay varies with unit size.TroubleshootingMake sure that the supply voltage matches theadjustable frequency drive voltage.Perform input voltage test.Perform soft charge circuit test.WARNING/ALARM 9, Inverter overloadThe frequency converter is about to cut out because of anoverload (too high current for too long). The counter forelectronic, thermal inverter protection issues a warning at98% and trips at 100%, while giving an alarm. Thefrequency converter cannot be reset until the counter isbelow 90%.The fault is that the frequency converter has run withmore than 100% overload for too long.TroubleshootingCompare the output current shown on the LCPwith the frequency converter rated current.Compare the output current shown on the LCPwith measured motor current.Display the Thermal Drive Load on the LCP andmonitor the value. When running above thefrequency converter continuous current rating,the counter increases. When running below thefrequency converter continuous current rating,the counter decreases.WARNING/ALARM 10, Motor overload temperatureAccording to the electronic thermal protection (ETR), themotor is too hot. Select whether the adjustable frequencydrive issues a warning or an alarm when the counterreaches 100% in 1-90 Motor Thermal Protection. The faultoccurs when the motor runs with more than 100%overload for too long.General Specifications and ... Design GuideMG11BC22 Danfoss A/S © Rev. 06/2014 All rights reserved. 1999 9