Danfoss VLT HVACDrive Instruction Manual

Also see for VLT HVAC Drive FC 100 Series: Design guide Design guide Programming guide Design guide

Contents

Danfoss VLT HVACDrive Instruction Manual Manual pdf 155 page image

8.1.2 Fault MessagesWARNING 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 V supply is over-loaded. Max. 15 mA or minimum 590 Ω.This condition can be caused by a short in a connected potentiometer orimproper wiring of the potentiometer.Troubleshooting: Remove the wiring from terminal 50. If the warningclears, the problem is with the customer wiring. If the warning does notclear, replace the control card.WARNING/ALARM 2, Live zero errorThis warning or alarm will only appear if programmed by the user inpar. 6-01Live Zero Timeout Function. The signal on one of the analoginputs is less than 50% of the minimum value programmed for that input.This condition can be caused by broken wiring or faulty device sendingthe signal.Troubleshooting:Check connections on all the analog input terminals. Controlcard terminals 53 and 54 for signals, terminal 55 common. MCB101 terminals 11 and 12 for signals, terminal 10 common. MCB109 terminals 1, 3, 5 for signals, terminals 2, 4, 6 common).Make sure that the drive programming and switch settingsmatch the analog signal type.Perform Input Terminal Signal Test.WARNING/ALARM 3, No motorNo motor has been connected to the output of the adjustable frequencydrive. This warning or alarm will only appear if programmed by the userin par. 1-80Function at Stop.Troubleshooting: Check the connection between the drive and the mo-tor.WARNING/ALARM 4, Mains phase lossA phase is missing on the supply side, or the line voltage imbalance is toohigh. This message also appears for a fault in the input rectifier on theadjustable frequency drive. Options are programmed at par. 14-12Func-tion at Mains Imbalance.Troubleshooting: Check the supply voltage and supply currents to theadjustable frequency drive.WARNING 5, DC link voltage highThe intermediate circuit voltage (DC) is higher than the high voltagewarning limit. The limit is dependent on the drive voltage rating. Theadjustable frequency drive is still active.WARNING 6, DC link voltage lowThe intermediate circuit voltage (DC) is lower than the low voltage warn-ing limit. The limit is dependent on the drive voltage rating. The adjust-able frequency drive is still active.WARNING/ALARM 7, DC overvoltageIf the intermediate circuit voltage exceeds the limit, the adjustable fre-quency drive trips after a time.Troubleshooting:Connect a brake resistorExtend the ramp timeChange the ramp typeActivate functions in par. 2-10Brake FunctionIncrease par. 14-26Trip Delay at Inverter FaultWARNING/ALARM 8, DC undervoltageIf the intermediate circuit voltage (DC) drops below the undervoltagelimit, the adjustable frequency drive checks if a 24 V backup supply isconnected. If no 24 V backup supply is connected, the adjustable fre-quency drive trips after a fixed time delay. The time delay varies with unitsize.Troubleshooting:Make sure that the supply voltage matches the adjustable fre-quency drive voltage.Perform Input voltage testPerform soft charge and rectifier circuit testWARNING/ALARM 9, Inverter overloadedThe adjustable frequency drive is about to cut out because of an overload(too high current for too long). The counter for electronic, thermal inver-ter protection gives a warning at 98% and trips at 100%, while giving analarm. The adjustable frequency drivecannot be reset until the counteris below 90%.The fault is that the adjustable frequency drive is overloaded by morethan 100% for too long.Troubleshooting:Come the output current shown on the LCP keypad with thedrive rated current.Come the output current shown on the LCP keypad with meas-ured motor current.Display the Thermal Drive Load on the keypad and monitor thevalue. When running above the drive continuous current rating,the counter should increase. When running below the drive con-tinuous current rating, the counter should decrease.Note See the derating section in the Design Guide for more details if ahigh switching frequency is required.WARNING/ALARM 10, Motor overload temperatureAccording to the electronic thermal protection (ETR), the motor is too hot.Select whether the adjustable frequency drive gives a warning or analarm when the counter reaches 100% in par. 1-90Motor Thermal Pro-tection. The fault is that the motor is overloaded by more than 100% fortoo long.Troubleshooting:Check if the motor is overheating.If the motor is mechanically overloadedThat the motor par. 1-24Motor Current is set correctly.VLT® HVAC Drive Instruction Manual 8 TroubleshootingMG.11.AB.22 - VLT® is a registered Danfoss trademark 8-58