Danfoss VLT HVAC Drive FC 102

The control card voltage from terminal 50 is less than 10 V, indicating an overload on the 10 V supply (maximum 15 mA or minimum 590 Ω). A short circuit in a connected potentiometer or incorrect wiring can cause this condition. This can lead to unreliable sensor readings or control circuit operation.

The motor's Electronic Thermal Relay (ETR) has detected an over-temperature condition. This indicates the motor is running too hot, potentially causing winding insulation damage and reducing motor lifespan. The drive trips to protect the motor.

An external thermistor connected to the motor has detected an over-temperature condition, indicating the motor is overheating. This is a direct, critical measurement of motor temperature, risking motor damage and requiring immediate action.

The drive has reached its configured torque limit, meaning it cannot provide more torque to the motor. This could indicate a mechanical blockage, an undersized motor or drive for the application, or incorrect parameter settings, preventing the motor from reaching its desired speed.

The motor current has exceeded the drive's safe operating limits. This is a critical fault indicating either a sudden load increase, a motor issue (e.g., winding fault), or a short circuit in the motor cables. This can lead to rapid component damage and cause the drive to trip.

Current is flowing from one of the motor phases to ground. This is a severe fault indicating insulation failure in the motor, motor cable, or drive output. It poses a shock hazard and risk of severe equipment damage if not promptly addressed.

The detected hardware configuration does not match the expected or supported configuration for the drive. This often occurs after component replacement or incorrect assembly, preventing proper drive operation and can lead to unexpected behavior.

A short circuit has been detected at the drive's output terminals, typically across motor phases or from a phase to ground. This is a critical fault that can cause immediate and severe damage to the drive and motor if not immediately addressed, leading to component failure.

The drive has not received a valid control word from the external controller (e.g., PLC via fieldbus) within the expected timeframe. This indicates a communication failure, causing the drive to stop or trip for safety reasons.

The drive attempted to start the motor but failed to achieve successful operation. This could be due to mechanical issues, incorrect motor parameters, insufficient power, or an inability to overcome the initial load.

An analog input signal is less than 50% of its programmed minimum value. This warning or alarm only appears if programmed in parameter 6-01 Live Zero Timeout Function. Causes typically include broken wiring or a faulty external device sending the signal, leading to incorrect process variable readings and potential operational errors.

A fault has been detected with one of the drive's internal cooling fans. This indicates a potential fan failure, which can lead to overheating and premature failure of the drive's internal components if not resolved, due to inadequate heat dissipation.

A fault has been detected with an external cooling fan connected to the drive or its enclosure. This can lead to insufficient cooling for the drive or its system, resulting in overheating and potential trips or damage to the equipment.

The connected braking resistor has been detected as short-circuited. This prevents proper energy dissipation during braking, potentially damaging the drive's braking chopper or causing overvoltage trips during deceleration.

The braking resistor has been dissipating energy continuously beyond its rated power limit. This indicates excessive or prolonged regenerative braking, potentially leading to resistor overheating and damage, or even fire hazards.

A fault has been detected in the Insulated Gate Bipolar Transistor (IGBT) responsible for controlling the braking resistor. This indicates a hardware failure in the braking chopper circuit, rendering the braking function inoperable and potentially leading to drive overvoltage trips during deceleration.

An issue was detected during the drive's internal mechanical brake check routine. This can indicate a problem with the mechanical brake itself, its control circuitry, or the drive's monitoring, potentially leading to unsafe operation or motor movement when stopped.

The temperature of the drive's heatsink has exceeded its safe operating limit. This is a critical indicator of insufficient cooling for the drive's power components, which can cause component damage and premature drive failure if not addressed.

No motor is detected connected to the output of the frequency converter. This prevents the drive from starting or operating correctly, as it expects a motor load. Attempting to run without a motor can cause issues with the drive's output stage.

Motor phase U is not detected between the frequency converter and the motor. This indicates a break in the motor wiring for phase U or a problem with the motor's winding. Operating with a missing phase can cause motor damage, instability, and inefficient operation, potentially damaging the frequency converter output stage due to imbalanced loading.

Motor phase V is not detected between the frequency converter and the motor. This indicates a break in the motor wiring for phase V or a problem with the motor's winding. Operating with a missing phase can cause motor damage, instability, and inefficient operation, potentially damaging the frequency converter output stage due to imbalanced loading.

Motor phase W is not detected between the frequency converter and the motor. This indicates a break in the motor wiring for phase W or a problem with the motor's winding. Operating with a missing phase can cause motor damage, instability, and inefficient operation, potentially damaging the frequency converter output stage due to imbalanced loading.

The frequency converter has been powered up too many times within a short period, leading to an inrush fault. Frequent power cycles can stress internal components, particularly the charging circuit, and may lead to premature failure if the unit is not allowed sufficient cool-down time between power cycles.

The fieldbus on the communication option card is not working. This prevents the frequency converter from communicating with the control system, leading to loss of external control and monitoring. This can halt or disrupt automated processes.

An alarm specific to an option card has been received, likely due to a power-up issue or a communication fault with the installed option card. This indicates the option card is not functioning correctly, compromising any features or connectivity it provides. This may require further diagnosis depending on the specific option.

The supply voltage to the drive has been lost. This warning/alarm is active only if parameter 14-10 Mains Failure is not set to 'No function'. A mains failure means the drive has lost its primary power source, leading to a complete shutdown and loss of motor control, which can impact process continuity.

There is a significant current imbalance detected between the power units within the frequency converter. This can indicate issues with the motor, motor cabling, or an internal problem within the drive's power stage. Sustained phase imbalance can cause overheating in the motor or drive components and lead to premature failure.

An internal fault has occurred within the frequency converter, indicated by a specific code number. This suggests a malfunction of the drive's internal circuitry or software. Such faults can lead to unpredictable behavior or complete operational shutdown, requiring expert diagnosis.

A phase is missing on the input supply side, or the mains voltage imbalance is excessively high. This message can also appear for a fault in the input rectifier of the drive. A missing phase causes imbalanced current draw and can lead to damage to the drive's input rectifier and upstream electrical components.

The internal 1.8V power supply, crucial for digital control circuitry, has dropped below its nominal voltage. This indicates an internal power supply fault or an excessive load on the internal power rail, which can lead to erratic operation or drive failure.

The motor's actual speed has exceeded a configured speed limit (e.g., Parameter 1-86 Trip Speed Low [RPM]). This could be due to a runaway load, incorrect scaling, or an issue with speed control, potentially causing mechanical damage or unsafe conditions.

The DC link voltage in the drive is abnormally high. This could indicate issues with the input power, braking resistor operation, or excessive regenerative energy from the motor, potentially causing component stress and drive damage.

The Automatic Motor Adaptation (AMA) routine failed to complete successfully. AMA is essential for optimizing drive performance with the connected motor, and its failure means the drive may not operate efficiently or correctly, leading to suboptimal control.

During the Automatic Motor Adaptation (AMA) process, the drive detected an inconsistency with the nominal voltage (Unom) and/or nominal current (Inom) parameters, indicating incorrect motor data entry. This prevents accurate motor modeling.

During the Automatic Motor Adaptation (AMA) process, the drive detected that the entered nominal motor current (Inom) is too low or inconsistent with the motor's actual characteristics. This could lead to an incorrect motor model and suboptimal control performance.

During the Automatic Motor Adaptation (AMA) process, the drive determined that the connected motor is too large for the drive's capabilities or the entered motor parameters are incorrect. This can hinder proper motor control and efficiency.

During the Automatic Motor Adaptation (AMA) process, the drive determined that the connected motor is too small for optimal drive control, or the entered motor parameters are incorrect. This can lead to poor control performance or inefficiency.

During the Automatic Motor Adaptation (AMA) process, one or more motor parameters were determined to be outside the acceptable range for the drive or could not be determined accurately. This prevents the drive from creating a proper motor model, impacting control.

The Automatic Motor Adaptation (AMA) routine was manually interrupted before completion. This means the motor model within the drive is incomplete or inaccurate, which can significantly affect motor control and overall performance.

The Automatic Motor Adaptation (AMA) routine failed to complete within the expected time limit. This could indicate a problem with the motor, motor connections, or the drive's ability to perform the adaptation, leading to an incomplete motor model.

An internal fault occurred within the drive during the Automatic Motor Adaptation (AMA) routine. This indicates a potential hardware or software issue within the drive itself, preventing successful motor adaptation and optimal control.

The drive has reached its output current limit, typically due to excessive motor load or during acceleration/deceleration. While often a warning, prolonged operation at the current limit can lead to overheating, nuisance trips, or premature component wear.

The DC link voltage in the drive is abnormally low. This typically points to issues with the input power supply, rectifier section, or temporary power dips, which can prevent the drive from operating correctly or cause it to trip.

An external safety interlock has been activated, preventing the drive from starting or causing it to stop. This is a crucial protective measure to ensure safe operation of personnel and equipment within the system.

The DC bus voltage has exceeded its safe operating limit. This condition can lead to component stress and potential damage to the drive. It is often caused by high mains voltage or regenerative energy from the motor during deceleration.

The DC bus voltage has dropped below its minimum acceptable level. This often results from insufficient input power, a phase loss, or heavy loading, leading to a drive trip to protect internal components from unstable operation.

The inverter section of the drive is operating beyond its continuous current rating, leading to excessive heat generation. This can cause damage to power components if left unaddressed, eventually leading to drive failure or reduced lifespan.