Danfoss VLT HVAC

The serial port cannot be initialized. This is an internal software or hardware issue with the communication port.

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.

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.

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.

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 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 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.

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.

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.

The motor's thermistor temperature sensor or its connection is faulty or disconnected. This means the drive cannot accurately monitor the motor's temperature, risking undetected overheating. An unresolved thermistor fault could lead to severe motor damage due to thermal stress if the motor is indeed overheating.

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.

A discharge of current from one or more output phases to ground has been detected, indicating an insulation breakdown. This fault can occur either in the motor cables connecting the drive to the motor or within the motor windings themselves. This is a critical safety fault posing an electrical shock hazard and potentially leading to severe damage to the frequency converter and motor 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.

This warning/alarm indicates a loss of communication with the frequency converter. It becomes active when parameter 8-04 Control Word Timeout Function is not set to [0] Off. If configured to [2] Stop and [26] Trip, the frequency converter will ramp down and then trip into an alarm state, indicating a critical communication failure.

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.

This warning/alarm signals a problem with the hoist mechanical brake control. It can be triggered if the required torque reference is not achieved before the timeout specified in parameter 2-27 Torque Ramp Up Time expires, or if the expected brake feedback is not received within the time limits set by parameter 2-23 Activate Brake Delay and parameter 2-25 Brake Release Time. This prevents proper control of the mechanical brake, which is critical for hoisting applications.

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.

This warning signifies that an external fan, monitored by the frequency converter's protective function, is not running or is not correctly mounted/detected. This indicates a potential cooling issue for external components or within the enclosure where the drive is installed, potentially leading to elevated operating temperatures. Similar to the internal fan, this monitor can be disabled via parameter 14-53 (Fan Monitor).

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.

This warning/alarm indicates that the average power dissipated by the brake resistor over the last 120 seconds has exceeded 90% of its rated capacity. The calculation is based on the DC-link voltage and the brake resistor value set in parameter 2-16 (AC brake Max. Current). If parameter 2-13 (Brake Power Monitoring) is configured for [2] Trip, the drive will fault and stop when the dissipation reaches 100%, signifying continuous excessive braking and potential overheating of the resistor.

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.

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 ground fault has been detected in the system, meaning current is flowing to earth through an unintended path. This is a critical safety issue that can cause electrical shock, equipment damage, or fire if not immediately addressed.

One or more of the internal power supplies (24V, 5V, ±18V) generated by the switch-mode power supply (SMPS) on the power card are operating outside their acceptable voltage range. This indicates an issue with the power card's internal power regulation, which can affect the functionality of other components and lead to instability or failure.

The 24V DC supply generated by the switch-mode power supply (SMPS) on the power card is operating below its acceptable voltage range. This low voltage can cause erratic behavior or non-operation of components that rely on the 24V supply, potentially leading to incorrect sensor readings or control issues.

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 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.

The motor current parameter (parameter 1-24) entered for the Automatic Motor Adaptation (AMA) is set too low for the connected motor. This incorrect setting can lead to inaccurate motor modeling during AMA, resulting in suboptimal drive control and potential misoperation or reduced 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.

The Automatic Motor Adaptation (AMA) cannot run because one or more parameter values related to the motor are outside of the acceptable range for the AMA algorithm. This indicates an invalid motor configuration that prevents the drive from accurately modeling the motor.

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.

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.

An inconsistency has occurred between the calculated motor speed and the speed measurement received from the feedback device (e.g., encoder). This indicates a potential issue with the feedback device, its wiring, or the drive's speed calculation, which can lead to unstable speed control or unexpected motor behavior.

The frequency converter's output frequency has reached or exceeded the maximum value set in parameter 4-19 (Max Output Frequency). This typically occurs when the drive is commanded to run faster than its configured limit, potentially indicating an over-speed condition or an incorrectly set limit for the application.

The actual motor current failed to exceed the configured release brake current within the specified start delay time window. This indicates an issue with the mechanical brake's release mechanism, potentially due to a stuck brake, insufficient current to release it, or incorrect timing settings, preventing the motor from starting.

The combination of the current load and motor speed demands a motor voltage higher than the actual DC-link voltage available in the frequency converter. This indicates that the drive cannot supply the necessary voltage for the commanded operation, potentially due to a low DC-link, excessive load, or too high a speed command for the input voltage.

This alarm indicates that a major power-related component, specifically the power section or switch mode power supply, within the frequency converter has been replaced. It serves as a service notification rather than an operational fault, confirming a hardware change. The drive should function normally after this alarm, assuming proper installation of the new part.

The frequency converter has detected a change in its internal type code, typically occurring after a control card replacement or a full drive swap. This alarm acts as an informational message signaling a significant change in the drive's identity or configuration. While not an immediate operational fault, it indicates a need to verify parameter settings for the new hardware.

The power EEPROM data is defective or too old. This indicates a corruption or obsolescence of the non-volatile memory storing power section parameters.

The power EEPROM data is defective or too old. This indicates a corruption or obsolescence of the non-volatile memory storing power section parameters.

The power EEPROM data is defective or too old. This indicates a corruption or obsolescence of the non-volatile memory storing power section parameters.

The control board EEPROM data is defective or too old. This indicates a corruption or obsolescence of the non-volatile memory storing control board parameters.

A communication timeout occurred while attempting to read EEPROM data. This suggests an issue with data access from the non-volatile memory.

A communication timeout occurred while attempting to read EEPROM data. This suggests an issue with data access from the non-volatile memory.

The application-oriented control system cannot recognize the EEPROM data. This indicates an incompatibility or corruption in the stored application parameters.

The signal on one of the analog inputs is less than 50% of the programmed minimum value. This condition, appearing if parameter 6-01 Live Zero Timeout Function is programmed, often indicates broken wiring or a faulty sensor/device sending the analog signal, risking incorrect operation or control.

No motor is connected to the output of the frequency converter. This prevents motor operation and could indicate a wiring issue or incorrect system setup.

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 for handling this are programmed in parameter 14-12 Function at Mains Imbalance. Operating with a missing phase can severely damage the motor or the frequency converter.

The DC-link voltage has exceeded its limit, causing the frequency converter to trip after a certain time. This often occurs due to regenerative braking or excessive mains voltage, which can damage the inverter section if not mitigated.

The DC-link voltage has dropped below the undervoltage limit. If no 24V DC back-up supply is connected, the frequency converter will trip after a fixed time delay (varying by unit size). This indicates insufficient input power, which can lead to uncontrolled motor shutdown.

The frequency converter has been operating with more than 100% overload for too long, triggering a warning at 98% and an alarm at 100%. The unit will trip, and cannot be reset until the internal thermal counter falls below 90%. Prolonged overload can severely damage the inverter's power components.

The motor's electronic thermal protection (ETR) indicates it is too hot. This fault occurs when the motor runs with more than 100% overload for an extended period, risking damage to motor windings and insulation. The frequency converter issues a warning at >90% and trips at 100% (depending on parameter 1-90 Motor Thermal Protection settings).

The motor thermistor indicates an overtemperature condition, or it may be disconnected. The frequency converter can be configured to issue either a warning or an alarm based on parameter 1-90 Motor Thermal Protection. This fault protects the motor from thermal damage.

The motor's torque has exceeded the value set in parameter 4-16 Torque Limit Motor Mode or the generator torque limit in parameter 4-17 Torque Limit Generator Mode. This condition can be a warning or escalate to an alarm and trip, protecting the mechanical system from excessive stress.

The inverter peak current limit (approximately 200% of rated current) has been exceeded. The warning lasts about 1.5 seconds before the frequency converter trips and issues an alarm. This is often caused by shock loading, rapid acceleration of high-inertia loads, or can occur after kinetic back-up. An overcurrent condition can rapidly damage the inverter's power components.

Current is flowing from the output phases to ground, either in the cable between the frequency converter and the motor, or within the motor itself. This is a severe fault that can cause electrocution, fire, and damage to the frequency converter or motor.

A fitted option card is not operational with the current control board hardware or software version. This indicates an incompatibility preventing proper functioning of the option.

There is a short circuit condition present in the motor or its wiring. This is a critical fault that can lead to immediate damage of the frequency converter's output stage if not quickly resolved.

Motor phase U between the frequency converter and the motor is missing. This indicates a loss of one of the three phases supplying the motor, which can lead to motor damage or failure if operated in this state.

The motor phase V connection between the frequency converter and the motor is missing or interrupted. This prevents proper motor operation and can lead to damage if ignored.

The motor phase W connection between the frequency converter and the motor is missing or interrupted. This prevents proper motor operation and can lead to damage if ignored.

Too many power-ups have occurred within a short time period. This can stress components due to repeated inrush currents, potentially causing premature failure of the frequency converter.

The fieldbus on the communication option card is not working. This prevents remote control or monitoring of the frequency converter, potentially leading to a loss of process control.

The supply voltage to the frequency converter is lost. This warning/alarm is active only if parameter 14-10 Mains Failure is not set to [0] No Function. This causes a complete loss of power to the drive and connected motor.

An internal fault has occurred within the frequency converter, indicated by a specific code number defined in Table 6.1. This signifies a malfunction in the drive's internal electronics or software, requiring further investigation to prevent potential damage.

There is an electrical discharge from one of the output phases to ground, either in the cable between the frequency converter and the motor or within the motor itself. This poses a significant safety risk and can cause severe equipment damage.

The supply voltage on the power card, which generates 24 V, 5 V, and ±18 V, is out of range. This indicates a problem with the switch mode power supply (SMPS) on the power card, affecting the drive's ability to control the motor's power transistors.

The detected 24 V DC voltage on terminal 12 of the control card has dropped below 18 V. This can impact the reliability of the control card and any external devices powered by this supply, potentially leading to incorrect operation or shutdowns.

The settings for motor voltage, motor current, or motor power are presumably incorrect. This prevents the Automatic Motor Adaptation (AMA) function from accurately identifying motor parameters, leading to suboptimal or incorrect motor control.

The motor current detected during the Automatic Motor Adaptation (AMA) process is too low. This usually indicates an incorrect motor current setting in the parameters or an issue with the motor connection itself, hindering proper parameter identification.

The motor connected is too large for the Automatic Motor Adaptation (AMA) function to be successfully performed by this frequency converter. The drive may not be adequately sized for the motor, which can lead to inaccurate parameter identification or drive overload.

The motor connected is too small for the Automatic Motor Adaptation (AMA) function to be successfully performed. This can lead to inaccurate motor parameter identification, potentially causing suboptimal motor control or unexpected behavior.

The parameter values found from the motor during the Automatic Motor Adaptation (AMA) process are outside the acceptable range for the frequency converter. This indicates an incompatibility between the motor and drive or severely incorrect initial motor data settings.

The Automatic Motor Adaptation (AMA) process was interrupted by the user. This is not an error but an indication that the parameter identification sequence was not completed, meaning the drive may not be optimally tuned for the motor.

The Automatic Motor Adaptation (AMA) process failed to complete within the expected time frame. This can occur due to various reasons, including excessive motor heating from repeated attempts, which can affect resistance measurements and prolong the process.

An internal fault occurred within the frequency converter during the Automatic Motor Adaptation (AMA) process. This suggests a problem with the drive's internal diagnostics or control logic, preventing accurate motor parameter identification.

An external interlock signal has been activated, causing the frequency converter to trip. This typically originates from a safety device or process control, indicating a condition that requires intervention before normal operation can resume to prevent injury or damage.

The temperature on the frequency converter's power card is outside its acceptable operating range (either too high or too low). Extreme temperatures can lead to premature component failure or immediate drive shutdown to prevent damage.

The control card and power card installed in the frequency converter are incompatible with each other. This prevents the drive from starting or operating correctly, requiring compatible hardware components for functionality.

The frequency converter's parameter settings have been reset to their factory default values, typically following a manual reset operation. This means all previous application-specific configurations are lost, and the drive will operate with generic settings.

A high back EMF voltage has been detected, indicating that the Permanent Magnet (PM) motor is rotating while the drive is attempting to control or start it. This can interfere with the drive's control algorithms and prevent a successful start.

The control card's 10 V supply from terminal 50 is less than 10 V, indicating it is overloaded. This can affect connected sensors or potentiometers, leading to incorrect control signals or loss of functionality.

The DC-link voltage is higher than the warning limit, which depends on the frequency converter's voltage rating. The unit remains active but operating at an elevated DC link voltage can shorten component life or lead to an overvoltage trip.

The DC-link voltage is lower than the warning limit, which depends on the frequency converter's voltage rating. The unit remains active but operating at a reduced DC link voltage can affect motor performance or lead to an undervoltage trip.

The motor current has exceeded the value set in parameter 4-18 (Current Limit). The drive is actively limiting the current to protect itself and the motor, but prolonged operation at this limit indicates an overloaded condition that can cause wear or damage.

This warning, specific to PM motors, indicates that the back electromotive force (EMF) voltage has exceeded 90% of the inverter's maximum voltage threshold (U invmax) and has remained high for over 5 seconds. This condition suggests that the motor is generating excessive voltage, potentially due to overspeeding or regenerative braking issues, which could lead to overvoltage trips.

The frequency converter has been activated into 'Fire Mode'. This mode forces the drive to continue operation even under fault conditions to maintain critical systems (e.g., smoke extraction fans) during an emergency. Be aware that this overrides normal safety shutdowns.

While in Fire Mode, one or more warranty-voiding alarms have been suppressed, indicating that the drive is operating under extreme conditions beyond its normal limits. This significantly increases the risk of equipment damage and voids the product warranty.

The signal on one of the analog inputs is less than 50% of the minimum value programmed for that input. This condition is typically caused by broken wiring, a loose connection, or a faulty signal-sending device connected to the frequency converter's analog input.

No motor is detected as connected to the output of the frequency converter. This condition prevents the drive from operating and indicates a potential wiring issue or a missing motor connection.

A phase is missing on the supply side of the frequency converter, or the mains voltage imbalance is excessively high. This message can also appear due to a fault in the input rectifier within the frequency converter, potentially leading to drive malfunction or damage.

The DC-link voltage inside the frequency converter has exceeded its predefined limit. This often occurs during deceleration of high inertia loads, where regenerative energy is fed back into the DC link, and can lead to component damage or drive trips if not controlled.

The DC-link voltage has dropped below the undervoltage limit. This typically indicates an insufficient or fluctuating supply voltage to the frequency converter, leading to a drive trip after a fixed time delay, which varies by unit size. Continued operation with low voltage can cause instability.

The frequency converter is experiencing an overload, with the internal thermal counter indicating that current levels are exceeding 100% for an extended duration. This activates electronic thermal protection, issuing a warning at 90% and an alarm trip at 100% to prevent damage. The drive cannot be reset until the counter falls below 90%.

The torque measured by the motor is below the threshold set for no-load conditions, strongly indicating a broken or severely slipping belt in the mechanical system. This results in a loss of power transmission to the driven equipment.