Danfoss VLT HVAC Drive High Power

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

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.

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.

This warning indicates that the frequency converter's internal fan is either not running or not properly detected, as monitored by an internal protective function. This can lead to insufficient cooling of the drive's internal components, risking overheating and potential damage. The fan monitor can be disabled via parameter 14-53 (Fan Monitor) if necessary for specific testing, but typically should remain active for protection.

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).

This warning is triggered when the brake resistor is detected as short-circuited during operation. While the frequency converter remains operational, its braking function is disabled, posing a safety risk in applications requiring active braking. Continued operation without a functional brake resistor can lead to uncontrolled deceleration or safety hazards.

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.

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.

This warning/alarm indicates that a brake check procedure has failed, suggesting that the brake resistor is either not connected to the frequency converter or is not functioning correctly. This condition prevents the drive from effectively controlling the mechanical brake, which can be critical for safety and operational integrity in certain applications.

The heat sink temperature has exceeded its maximum allowable limit, indicating an internal overheating condition within the frequency converter. This poses a significant risk of damage to the drive's power components if not addressed. The exact trip and reset temperatures are specific to the drive's power size, and the fault will automatically reset once the temperature drops below a predefined safe level.

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's actual speed is outside the range defined by parameter 4-11 (Motor Speed Low Limit [RPM]) and parameter 4-13 (Motor Speed High Limit [RPM]). If the speed drops below parameter 1-86 (Trip Speed Low [RPM]) (excluding start/stop conditions), the frequency converter will trip, indicating a potential control issue or an abnormal operating condition.

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 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 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.

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

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) routine was manually interrupted before completion. This means the drive did not fully characterize the motor, and subsequent operation may not be optimized.

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.

A persistent internal fault has occurred during the Automatic Motor Adaptation (AMA) process that cannot be resolved through simple restarts. This indicates a potentially deeper issue with the drive's internal diagnostics or hardware.

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 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.

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 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.

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.

Motor phase V 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.

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.

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 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.