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 has dropped below 10 V. This is typically caused by an overloaded 10 V supply (exceeding 15 mA or below 590 Ω minimum resistance) or a short circuit in a connected potentiometer or its wiring. If left unresolved, this can lead to unstable control card operation or system shutdown.

This warning or alarm appears if programmed in 6-01 Live Zero Timeout Function. It indicates that the signal on one of the analog inputs is less than 50% of the minimum value programmed for that input. Common causes include broken wiring or a faulty device sending the signal, which can lead to incorrect process control.

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 supply side, or the mains voltage imbalance is excessively high. This message can also indicate a fault within the input rectifier on the frequency converter. Unresolved mains phase loss can lead to severe damage to the frequency converter or connected motor.

The intermediate circuit voltage (DC) has risen above the high-voltage warning limit, which is dependent on the frequency converter's voltage rating. The unit is still active, but operating at an elevated voltage could stress internal components or lead to a trip if limits are exceeded.

The intermediate circuit voltage (DC) has dropped below the low-voltage warning limit, which is dependent on the frequency converter's voltage rating. The unit is still active, but operating with insufficient voltage could affect performance or lead to a trip.

If the intermediate circuit voltage exceeds its critical limit, the frequency converter will trip after a time delay. This fault often occurs due to regenerative braking, sudden load changes, or issues with the mains supply. Repeated overvoltage trips can damage the drive's power components.

If the intermediate circuit voltage (DC link) drops below the under-voltage limit, the frequency converter checks for a 24 V DC back-up supply. If no back-up is connected, the unit trips after a fixed delay. This condition can lead to unexpected shutdowns and loss of motor control.

The frequency converter is operating with an excessively high current for too long, nearing its thermal protection limit. The electronic thermal inverter protection counter issues a warning at 98% and an alarm trip at 100%. The unit cannot be reset until the counter drops below 90%, indicating a significant risk of damage to the inverter if prolonged.

According to the electronic thermal protection (ETR), the motor is excessively hot due to prolonged operation above 100% load. This indicates a severe mechanical overload on the motor. Ignoring this alarm can lead to permanent motor damage or reduced lifespan. The frequency converter can be configured to issue a warning or alarm based on the counter reaching 100% in parameter 1-90.

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 motor torque has exceeded the programmed limits in parameter 4-16 (Motor Mode) or 4-17 (Generator Mode). This can be caused by excessive load, rapid acceleration/deceleration, or incorrect limit settings. Persistent torque limiting can hinder application performance or cause unexpected stops.

The inverter's peak current limit has been exceeded, causing the frequency converter to trip into an alarm state after approximately 1.5 seconds of warning. This typically indicates a sudden increase in motor load, such as shock loading, a jam, or excessively fast acceleration of high-inertia loads. Persistent overcurrents can severely stress and damage the frequency converter's power components and the motor.

There is an undesirable current path from one or more output phases to earth, either in the cable connecting the frequency converter to the motor or within the motor itself. This fault indicates a serious insulation breakdown, posing a safety risk and potential for severe equipment damage if power is not immediately removed.

A fitted option card or module is not compatible or operational with the current control board hardware or software version in the frequency converter. This prevents the unit from functioning correctly and requires contacting support for resolution. Incorrect component pairings can lead to system instability.

A direct short circuit exists in the motor windings or the motor wiring connected to the frequency converter's output terminals. This is a critical fault that can cause immediate and severe damage to the frequency converter's output stage if power is not removed quickly. Continued operation is highly dangerous.

The frequency converter has stopped receiving valid control word commands via its serial communication interface, leading to a timeout. This alarm is active when parameter 8-04 Control Timeout Function is not set to [0] Off. If configured to Stop and Trip, the drive will safely ramp down and then trip, indicating a loss of communication. Unresolved communication loss prevents external control of the drive.

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.

The frequency converter's internal cooling fan is either not running, seized, or improperly mounted, specifically affecting 400 V, 30–90 kW units. This protection function ensures adequate heat dissipation from the drive's components. Continued operation without a functioning fan will inevitably lead to critical overheating and premature failure of the frequency converter.

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.

This warning/alarm indicates a short circuit in the brake IGBT, which disables the brake function. A critical consequence is that substantial power is continuously transmitted to the brake resistor, even if the brake function is inactive, creating a high voltage hazard and risking severe overheating of the resistor. This fault can also be triggered by an overheated brake resistor (using Klixon inputs 104 and 106) or in 12-pulse frequency converters if a disconnect or circuit breaker is opened while the unit is operating.

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.

Too many power-ups have occurred within a short time period, leading to excessive inrush current events. This frequent power cycling prevents the unit from dissipating heat and can stress internal components, potentially shortening the drive's lifespan.

The fieldbus communication option card is not functioning or communicating correctly. This prevents the drive from receiving commands or sending status information to the connected control system, leading to loss of remote control and monitoring capabilities. Unresolved, this fault will halt automated operation.

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 frequency converter has detected a loss of incoming supply voltage, and the 'Mains Failure' parameter (14-10) is configured to generate an alarm. This indicates a power supply interruption to the drive, which will cause the motor to stop. Until mains power is restored, the drive cannot operate.

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.

A general internal fault has been detected within the frequency converter, preventing normal operation. A specific sub-code, referenced in Table 7.6, provides more detailed diagnostic information about the nature of the internal issue. This fault indicates a critical hardware or software problem requiring specific troubleshooting based on the sub-code.

The internal serial communication port failed to initialize upon power-up or during operation. This can prevent communication with the LCP or external serial devices, indicating a possible internal hardware or firmware issue with the control board.

The Electrically Erasable Programmable Read-Only Memory (EEPROM) on the power card, which stores crucial operational data, is either corrupted or obsolete. This hardware fault on the power card prevents the drive from properly initializing or operating.

A general internal system error has occurred within a specific range, indicating a deeper hardware or firmware issue not covered by more specific sub-codes. This type of fault typically points to a critical internal component failure that prevents normal drive operation.

An internal parameter's stored value has fallen outside its predefined minimum or maximum allowable range. This can be caused by data corruption, an incorrect parameter write, or a software anomaly, leading to unexpected drive behavior or shutdown.

A general internal system error has occurred within a specific range, indicating a deeper hardware or firmware issue not covered by more specific sub-codes. This type of fault typically points to a critical internal component failure that prevents normal drive operation.

The software version on the option card installed in slot A is detected as being outdated or incompatible with the frequency converter's current firmware. This mismatch can lead to communication errors, incorrect functionality, or complete failure of the option card.

The software version on the option card installed in slot B is detected as being outdated or incompatible with the frequency converter's current firmware. This mismatch can lead to communication errors, incorrect functionality, or complete failure of the option card.

The software on the option card installed in slot A is not recognized or supported by the frequency converter's firmware. This indicates a fundamental incompatibility, preventing the option card from integrating correctly with the drive's control system.

The software on the option card installed in slot B is not recognized or supported by the frequency converter's firmware. This indicates a fundamental incompatibility, preventing the option card from integrating correctly with the drive's control system.

A general internal system error has occurred within a specific range, indicating a deeper hardware or firmware issue not covered by more specific sub-codes. This type of fault typically points to a critical internal component failure that prevents normal drive operation.

The frequency converter's control card has been detected as faulty and is no longer able to perform its critical functions. This component is essential for all drive operations, and its failure will completely disable the drive.

An internal memory stack overflow has occurred within the Local Control Panel (LCP) processor. This typically indicates a transient software issue or excessive processing demand within the LCP firmware, potentially leading to unresponsive controls or system crashes.

The internal serial communication buffer has overflowed, meaning data is being received faster than the drive can process it. This leads to data loss and unreliable serial communication, affecting remote control and monitoring via the serial port.

The internal USB communication buffer has overflowed, indicating that data is being received faster than the drive can process it. This leads to data loss and unreliable USB communication, affecting diagnostics or parameter transfers.

An internal parameter's stored value has fallen outside its predefined minimum or maximum allowable range within a specific memory region. This can be caused by data corruption, an incorrect parameter write, or a software anomaly, leading to unexpected drive behavior or shutdown.

The hardware of the option card installed in slot A is fundamentally incompatible with the drive's control board hardware. This hardware mismatch prevents the option card from functioning correctly and may lead to system instability or other operational faults.

The hardware of the option card installed in slot B is fundamentally incompatible with the drive's control board hardware. This hardware mismatch prevents the option card from functioning correctly and may lead to system instability or other operational faults.

A general internal system error has occurred within a specific range, indicating a deeper hardware or firmware issue not covered by more specific sub-codes. This type of fault typically points to a critical internal component failure that prevents normal drive operation.

The frequency converter is not receiving a temperature signal from the heatsink sensor, specifically the IGBT thermal sensor on the power card. This loss of feedback means the drive cannot monitor critical internal temperatures, posing a significant risk of overheating and damage to the power semiconductors if not resolved.

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 1.8V DC supply on the control card, crucial for its internal logic, has dropped below its allowable limits. This low voltage indicates a potential fault on the control card itself or an overload caused by an option card, leading to unstable operation or complete control card failure.

The motor speed is not within the specified range set in parameters 4-11 (Motor Speed Low Limit) and 4-13 (Motor Speed High Limit), generating a warning. If the speed drops below the limit set in 1-86 (Trip Speed Low) (except during start/stop), the frequency converter will trip. This indicates an operational deviation that could affect process control or product quality.

The Automatic Motor Adaptation (AMA) routine failed to complete successfully. AMA is crucial for optimizing drive performance by precisely identifying motor parameters. A failed calibration means the drive is not operating with optimal motor data, potentially leading to inefficient operation, motor stress, or poor control.

The settings for motor voltage, motor current, and motor power (parameters 1-20 to 1-25) are incorrect or inconsistent, preventing the Automatic Motor Adaptation (AMA) from running accurately. Using incorrect motor data will result in suboptimal drive performance and potentially damage to the motor or drive.

The motor current is detected as too low for the Automatic Motor Adaptation (AMA) process to properly function. This may indicate an incorrect motor data entry or an undersized motor for the drive's capabilities. Incorrect current settings hinder accurate motor characterization and optimal drive performance.

The connected motor is too large for the Automatic Motor Adaptation (AMA) function to operate successfully with this frequency converter. This suggests an incompatibility or misapplication, preventing proper motor characterization and potentially leading to suboptimal or unsafe operation. The drive may not be able to accurately control or protect such a large motor.

The connected motor is too small for the Automatic Motor Adaptation (AMA) function to operate successfully. This mismatch in sizing or parameter limits means the drive cannot accurately identify the motor's characteristics, leading to an inability to optimize control.

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) process was intentionally stopped by the user. If this was unintentional, it means AMA did not complete its motor characterization. This will prevent the drive from optimizing motor control and protection based on the motor's actual electrical properties.

An internal fault occurred during the Automatic Motor Adaptation (AMA) process. While a single occurrence might be transient, repeated occurrences suggest a more persistent issue within the drive's control logic or its interaction with the motor, potentially heating the motor due to repeated attempts.

An internal fault occurred during the Automatic Motor Adaptation (AMA) process that requires expert intervention. This indicates a more complex problem within the drive's control logic or measurement system during motor characterization. It cannot be resolved by simple restart and requires deeper diagnosis.

The motor current has exceeded the value set in parameter 4-18 (Current Limit). This indicates that the motor is drawing excessive current, potentially due to overload, incorrect motor data, or a mechanical issue, which could lead to motor or drive overheating and damage if not addressed.

An external interlock, configured to stop the drive, has been activated via a digital input. This prevents the drive from operating until the interlock condition is cleared and a reset signal is sent, ensuring safety or process integrity.

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 output frequency has reached the maximum value set in parameter 4-19 (Max Output Frequency). This indicates the drive is attempting to run the motor faster than its configured limit, potentially due to incorrect parameter settings or application requirements exceeding the drive's setup. The warning will clear when the output frequency drops below the maximum limit.

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.

The control card temperature has reached its cut-out limit of 80 °C, indicating excessive heat within the control section of the frequency converter. This can lead to erratic behavior, reduced lifespan, or permanent damage to the control card if not addressed. Proper cooling is essential for its reliability.

The frequency converter's heatsink temperature, measured by a sensor in the IGBT module, is too low for safe operation. This indicates the unit is too cold to operate efficiently or without condensation risk. Operation at extremely low temperatures can affect component reliability and performance.

One or more option modules (e.g., fieldbus cards, I/O extensions) have either been added or removed since the last power-down cycle. The drive detects a change in its hardware configuration and requires user confirmation. This alarm serves as a notification and requires a reset to ensure the change was intentional before proceeding.

The Safe Stop function has been activated, bringing the motor to a controlled stop and preventing unintended restart. This is a critical safety feature typically triggered by an external safety input. The drive will remain in this state until the safety input is cleared and a reset commanded.

The temperature sensor on the power card indicates that it is either too hot or too cold, exceeding safe operating limits. Extreme temperatures can severely affect the power components (IGBTs, capacitors), leading to reduced lifespan, performance issues, or immediate failure of the drive if not corrected.

The installed control card and power card within the frequency converter are incompatible with each other. This indicates an incorrect pairing of components, potentially due to wrong spare parts or an assembly error. The drive cannot operate with this configuration and requires corrective action.

The frequency converter's parameter settings have been reset to their factory default values, typically after a manual reset action. This alarm serves as a notification that custom configuration has been lost. The drive will operate with default parameters until reconfigured, potentially affecting application performance and safety.

A no-flow condition has been detected in the system, and parameter 22-23 (No-Flow Function) is set to trigger an alarm. This indicates a critical deviation in the process, such as a pump running dry or a blocked pipe. Continued operation in a no-flow state can damage pumps or other system components.

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.

The motor phase U 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 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.

Motor phase W 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.

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.