Danfoss VLT VFD Drive FC 301/302 Warnings and Alarms 1 to 10

In this Article we are going to see Danfoss VLT Drive FC 301/302 Warnings and Alarms 1 to 10.

Danfoss VFD


WARNING-1: (10-Volts low)

Danfoss VLT VFD Drive FC 301/302

  • The control card voltage is less than 10 Volt from terminal 50.
  • Remove some of the load from terminal 50, as the 10 Volt supply is overloaded.
  • Maximum 15 mA or minimum 590 ohm.
  • A short circuit in a connected potentiometer or incorrect wiring of the potentiometer can cause this condition.

 Troubleshooting Methods:

  • Remove the wiring from terminal 50,
  • If the warning clears, the problem is with the wiring,
  • If the warning does not clear, replace the control card.

 

WARNING/ALARM-2: (Live zero error)

Danfoss VLT VFD Drive FC 301/302

  • This warning or alarm only appears if programmed by the user in parameter 6-01 Live Zero Timeout Function.
  • The signal on 1 of the analog inputs is less than 50% of the minimum value programmed for that input.
  • Broken wiring or faulty device sending the signal can cause this condition.

Troubleshooting Methods:

  • Check connections on all the analog input terminals,
  • Control card terminals 53 and 54 for signals, terminal 55 common,
  • VLT General Purpose I/O MCB 101 terminals 11 and 12 for signals, terminal 10 common,
  • VLT Analog I/O MCB 109 terminals 1, 3, 5 for signals, terminals 2, 4, 6 common,
  • Check that the frequency converter programming and switch settings match the analog signal type,
  • Perform Input Terminal Signal Test,

 

WARNING/ALARM-3: (No motor)

Danfoss VLT VFD Drive FC 301/302

  • No motor is connected to the output of the frequency converter.

 

WARNING/ALARM-4: (Mains phase loss)

Danfoss VLT VFD Drive FC 301/302

  • A phase is missing on the supply side, or the mains voltage imbalance is too high.
  • This message also appears for a fault in the input rectifier.
  • Options are programmed in parameter 14-12 Response to Mains Imbalance.

Troubleshooting Methods:

  • Check the supply voltage and supply currents to the frequency converter.

 

WARNING-5: (DC link voltage high)

Danfoss VLT VFD Drive FC 301/302

  • The DC-link voltage is higher than the high-voltage warning limit.
  • The limit depends on the frequency converter voltage rating.
  • The unit is still active.

 

WARNING-6: (DC link voltage low)

Danfoss VLT VFD Drive FC 301/302

  • The DC-link voltage is lower than the low-voltage warning limit.
  • The limit depends on the frequency converter voltage rating.
  • The unit is still active.

 

WARNING/ALARM-7: (DC over voltage)

Danfoss VLT VFD Drive FC 301/302

  • If the DC-link voltage exceeds the limit, the frequency converter trips after some time.

Troubleshooting Methods:

  • Connect a brake resistor.
  • Extend the ramp time.
  • Change the ramp type.
  • Activate the functions in parameter 2-10 Brake Function.
  • Increase parameter 14-26 Trip Delay at Inverter Fault.

 

WARNING/ALARM-8: (DC under voltage)

Danfoss VLT VFD Drive FC 301/302

  • If the DC-link voltage drops below the under voltage limit, the frequency converter checks if a 24 Volt DC back-up supply is connected.
  • If no 24 Volt DC back-up supply is connected, the frequency converter trips after a fixed time delay.
  • The time delay varies with unit size.

Troubleshooting Methods:

  • Check that the supply voltage matches the frequency converter voltage.
  • Perform an input voltage test.
  • Perform a soft charge circuit test.

 

WARNING/ALARM-9: (Inverter overload)

Danfoss VLT VFD Drive FC 301/302

  • The frequency converter has run with more than 100% overload for too long and is about to cut out.
  • The counter for electronic thermal inverter protection issues a warning at 98% and trips at 100% with an alarm.
  • The frequency converter cannot be reset until the counter is below 90%.

Troubleshooting Methods:

  • Compare the output current shown on the LCP with the frequency converter rated current and measured motor current
  • Show the thermal frequency converter load on the LCP and monitor the value.
  • When running above the frequency converter continuous current rating, the counter increases.
  • When running below the frequency converter continuous current rating, the counter decreases.

 

WARNING/ALARM-10: (Motor Overload Temperature)

Danfoss VLT VFD Drive FC 301/302

  • According to the electronic thermal protection (ETR), the motor is too hot.

Select 1 of these options:

  • The frequency converter issues a warning or an alarm when the counter is >90% if parameter 1-90 Motor Thermal Protection is set to warning options.
  • The frequency converter trips when the counter reaches 100% if parameter 1-90 Motor Thermal Protection is set to trip options.
  • The fault occurs when the motor runs with more than 100% overload for too long.

Troubleshooting Methods:

  • Check for motor overheating.
  • Check if the motor is mechanically overloaded.
  • Check that the motor current set in parameter 1-24 Motor Current is correct.
  • Ensure that the motor data in parameters 1-20 to 1-25 is set correctly.
  • If an external fan is in use, check that it is selected in parameter 1-91 Motor External Fan.
  • Running AMA in parameter 1-29 Automatic Motor Adaptation (AMA) tunes the frequency converter to the motor more accurately and reduces thermal loading.

 


Video Link: 

DANFOSS FC 51 VLT Micro drive Settings 1.Danfoss VFD Drive LCP SIMULATOR Tool Overview 2. DANFOSS VLT-6000 HVAC VFD Drive Basic Setting Parameter Part-1 3. DANFOSS INVERTER FC-301/302 Setting Parameters (Part-4) 4. DANFOSS INVERTER FC-301/302 Setting Parameters (Part-3) 5. DANFOSS INVERTER FC-301/302 Setting Parameters (Part-2) 6. DANFOSS INVERTER FC-301/302 Setting Parameters (Part-1) 7. Danfoss VLT VFD Drive FC 301/302 Warnings and Alarms 1-10 Part-1


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