Danfoss VLT FC51 Inverter Fault Code Query

Here is the revised version of the fault codes for the Danfoss inverter panel, with some improvements in clarity and consistency:

Fault Code List for Danfoss Inverter Panel (FC51 Series)

Fault Code: 2
Fault Phenomenon: Disconnection Fault
Fault Causes and Countermeasures: The signal on terminal 53 or 60 is lower than 50% of the setting in terminal 6-10 (535 low voltage), 6-12 (53 low current), or 6-22 (54 low current). Check the relevant settings and terminals.

Fault Code: 4
Fault Phenomenon: Main Power Supply Phase Loss
Fault Cause and Countermeasures: The power supply side lacks a phase, or the voltage is severely unbalanced. Check the vehicle power supply voltage and the inverter's supply voltage and current.

Fault Code: 7
Fault Phenomenon: DC Circuit Overvoltage
Fault Causes and Countermeasures: The voltage of the intermediate circuit exceeds the limit. Take appropriate action to reduce the voltage.

Fault Code: 8
Fault Phenomenon: DC Circuit Undervoltage
Fault Causes and Countermeasures: The intermediate circuit voltage is lower than the "low voltage warning" limit. Check and address the cause of the undervoltage.

Fault Code: 9
Fault Phenomenon: Inverter Overload
Fault Causes and Countermeasures: The load exceeding 100% lasted for too long. Check whether the output current of the inverter reaches the rated current and reduce the load if necessary.

Fault Code: 10
Fault Phenomenon: Motor ETR Overheating
Fault Causes and Countermeasures: The load exceeding 100% lasted for too long, causing the motor to overheat. Check the output current of the inverter and reduce the load.

Fault Code: 11
Fault Phenomenon: High Motor Thermistor Temperature
Fault Cause: The thermistor or its connection is disconnected. Check the thermistor and its connections.

Fault Code: 12
Fault Phenomenon: Torque Limit
Fault Causes and Countermeasures: The torque exceeds the setting value in parameter 4-16 or 4-17. Adjust the torque limit settings.

Fault Code: 13
Fault Phenomenon: Overcurrent
Fault Cause and Countermeasure: The peak current limit of the inverter was exceeded. Check the load and reduce if necessary.

Fault Code: 14
Fault Phenomenon: Ground Fault
Fault Causes and Countermeasures: The output phase is discharging to the ground. Use a megohmmeter to test the insulation of the output power supply to ground and address any issues found.

Fault Code: 16
Fault Phenomenon: Short Circuit
Fault Cause and Countermeasure: A short circuit occurs in the motor or motor terminals. Check and repair the short circuit.

Fault Code: 17
Fault Phenomenon: Control Word Timeout
Fault Causes and Countermeasures: No information is sent to the inverter. Check the communication lines and ensure they are properly connected.

Fault Code: 25
Fault Phenomenon: Brake Resistor Short Circuit
Fault Causes and Countermeasures: The braking resistor is short-circuited, disconnecting the braking function. Replace the braking resistor.

Fault Code: 27
Fault Phenomenon: Brake Chopper Short Circuit
Fault Causes and Countermeasures: The braking transistor is short-circuited, disconnecting the braking function. Replace the braking transistor.

Fault Code: 28
Fault Phenomenon: Brake Check
Fault Causes and Countermeasures: The brake resistor is not connected or cannot work. Check the connection and functionality of the brake resistor.

Fault Code: 29
Fault Phenomenon: Power Card Temperature
Fault Causes and Countermeasures: The heat sink has reached its cut-off temperature. Take appropriate action to cool the power card.

Fault Code: 30-32
Fault Phenomenon: Motor Lacks U/V/W Phase
Fault Cause and Countermeasure: The motor is missing the U/V/W phase. Check the corresponding phase and ensure it is properly connected.

Fault Code: 38
Fault Phenomenon: Internal Failure
Fault Cause: Please contact the supplier at the time of purchase for assistance.

Fault Code: 44
Fault Phenomenon: Ground Fault (same as Fault Code 14)
Fault Causes and Countermeasures: Refer to Fault Code 14 for causes and countermeasures.

Fault Code: 47
Fault Phenomenon: Control Voltage Fault
Fault Cause: The 24V DC may be overloaded. Check the load on the control voltage and reduce if necessary.

Fault Code: 51
Fault Phenomenon: AMA Checks Unom and Inom
Fault Cause: Incorrect setting of motor voltage or motor current. Adjust the settings to the correct values.

Fault Code: 52
Fault Phenomenon: AMA Inom is Too Low
Fault Cause: The motor current is too low. Check the relevant settings and ensure they are correct.

Fault Code: 59
Fault Phenomenon: Current Limit
Fault Causes and Countermeasures: The VLT is overloaded. Reduce the load or adjust the current limit settings.

Fault Code: 63
Fault Phenomenon: Mechanical Brake is Too Low
Fault Causes and Countermeasures: The actual motor current has not exceeded the "brake release" current during the "start delay" period. Check the brake settings and ensure they are correct.

Fault Code: 80
Fault Phenomenon: Inverter Initialization
Fault Cause: The settings of all parameters are initialized to the default settings. Reconfigure the parameters as needed.

Fault Code: 84
Fault Phenomenon: Lost Connection Between Inverter and LCP
Fault Cause: No communication between LCP and inverter. Check the communication lines and ensure they are properly connected.

Fault Code: 86
Fault Phenomenon: Replication Fails
Fault Cause: An error occurred when copying between the inverter and LCP. Retry the copy operation and ensure the data is correct.

Fault Code: 87
Fault Phenomenon: LCP Data is Invalid
Fault Cause: This error occurs when copying from LCP if LCP contains wrong data or no data is uploaded to LCP. Check the data in LCP and ensure it is correct.

Fault Code: 88
Fault Phenomenon: LCP Data is Not Compatible
Fault Cause: This error occurs when copying from LCP if data is moved between drives with very different software versions. Ensure the software versions are compatible before copying data.

Fault Code: 89
Fault Phenomenon: The Parameter is Read-Only
Fault Cause and Countermeasures: This error occurs when trying to write a read-only parameter. Ensure you are not trying to modify a read-only parameter.

Fault Code: 90
Fault Phenomenon: The Parameter Database is Busy
Fault Cause: LCP and RS485 connections try to update parameters at the same time. Wait for the database to be free before attempting to update parameters.

Fault Code: 91
Fault Phenomenon: The Parameter Value is Invalid in This Mode
Fault Cause: This error occurs when trying to write an illegal value to a parameter. Ensure the value you are writing is within the allowed range for the parameter.

Fault Code: 92
Fault Phenomenon: The Parameter Value Exceeds the Minimum/Maximum Limit
Fault Cause: This error occurs when trying to set a value out of range. Adjust the value to be within the allowed range for the parameter.