Danfoss VLT 2800 Variable Speed Drive

The electronic thermal protection indicates the motor is too hot due to being overloaded by more than 100% for too long. Parameter 128 allows the user to select whether the drive emits a warning or an alarm. This protects the motor from thermal damage.

The motor is too hot, or the thermistor/thermistor connection is cut off. Parameter 128 allows choosing whether the drive issues a warning or an alarm. This fault indicates a thermal issue with the motor or a wiring problem with its temperature sensor.

The output current has exceeded the value set in parameter 221 (Current Limit ILIM). The adjustable frequency drive will trip after a period defined by parameter 409 (Trip delay overcurrent). This indicates a sustained overload condition on the motor.

The inverter’s peak current limit (approximately 200% of rated output current) has been exceeded. This is a severe, instantaneous overload condition that will cause the drive to trip and alarm after 1-2 seconds. It can indicate a mechanical jam or an incorrectly sized motor/drive.

There is a discharge from the output phases to ground, which could be in the cable connecting the adjustable frequency drive to the motor, or within the motor itself. This fault poses a safety risk and indicates insulation breakdown.

This fault indicates an internal problem with the drive's switch mode power supply, which is responsible for internal voltage regulation. This is an internal hardware failure within the drive itself.

A short-circuit condition exists on the motor terminals or within the motor windings. This severe fault can lead to significant damage if not addressed quickly.

No serial communication is being received by the adjustable frequency drive. This warning is active only when parameter 514 (Bus time interval function) is set to a value other than OFF. If set to 'Stop and trip', it will escalate from a warning to an alarm after a timeout.

No serial communication is occurring with the adjustable frequency drive’s communication option card (HPFB bus). This warning is active only when parameter 804 (Bus time interval function) is set to a value other than OFF. If set to 'Stop and trip', it will ramp down and trip into an alarm state.

The voltage or current signal on terminal 53 or 60 has dropped below 50% of its preset minimum scaling value (parameter 309 or 315). This indicates a problem with the analog input signal that the drive uses for control or feedback.

The output frequency has reached either the low limit (parameter 201) or high limit (parameter 202). This warning indicates the drive is operating at its frequency boundaries, potentially unable to maintain the desired process speed. It activates in the display unless in 'Process regulation, closed loop' mode, where it only sets a status bit.

This communication fault specifically occurs in Profibus versions of the drive. It indicates a problem with data exchange over the Profibus network via the HPFB option card.

This alarm appears when the adjustable frequency drive has been connected to the AC line supply too many times within a short period (1 minute). This typically indicates repeated power cycling that can stress internal components.

The heatsink temperature has risen above a critical threshold (167-185°F / 75-85°C). The drive initially issues a warning, and if the temperature continues to rise, it automatically reduces the switching frequency to mitigate heating. Prolonged high temperatures can lead to component degradation and drive failure.

This fault indicates a communication error occurring between the drive's control card and the BMC2 component. Such an issue can prevent proper command execution or feedback, potentially leading to erratic drive behavior or complete shutdown. It points to a hardware or connection problem within the control circuitry.

A fault has been detected in the Flash EEPROM on the control card. This memory stores critical firmware and configuration data, so an error here can corrupt drive operations or prevent the drive from booting correctly. It's a hardware failure on the control card.

This alarm signals a fault in the Random Access Memory (RAM) on the control card. RAM is essential for temporary data storage during drive operation, and an error can lead to system instability, incorrect calculations, or a complete operational failure. This indicates a hardware defect on the control card.

A phase is missing on the AC line supply side of the adjustable frequency drive. This fault only activates in 3-phase AC line systems. It indicates an issue with the incoming power supply to the drive, such as a blown fuse, tripped breaker, or utility problem.

An error has been detected in the calibration constants stored in the EEPROM. These constants are vital for accurate measurement and control, and any discrepancy can lead to incorrect drive outputs, poor motor control, or misinterpretation of sensor data. This suggests data corruption or a hardware issue with the EEPROM.

This fault indicates an error within the data values stored in the EEPROM. This memory holds configuration settings and operational data, and corruption can lead to the drive operating with incorrect parameters or failing to start. It points to a memory integrity issue on the control card.

A fault has been detected in the motor parameter database, which stores crucial information about the connected motor. This can prevent the drive from accurately controlling the motor, potentially leading to inefficient operation, overheating, or motor damage. It implies a data integrity issue within the drive's memory.

This is a general fault indicating a problem with the drive's power card. This component is responsible for the power conversion and control to the motor, so a fault here implies a significant hardware failure that will prevent the drive from outputting power. This requires immediate attention to prevent further damage.

This fault indicates that the software version on either the control card or the BMC2 is below the minimum required for proper operation or compatibility. This can lead to system malfunctions, feature limitations, or communication failures within the drive. An update or replacement might be necessary.

An Input/Output (I/O) fault has occurred, affecting digital inputs/outputs, relay outputs, or analog inputs/outputs. This means the drive cannot correctly receive external signals or send control commands, disrupting automation processes. This could be due to external wiring, sensor issues, or internal I/O circuitry failure.

The DC bus voltage (VDC) has exceeded the 'Voltage warning high' limit. The motor continues to operate, but if the VDC remains high for 5-10 seconds, the inverter will trip with an Alarm 7 (Overvoltage). This can be caused by an excessively high supply voltage or fast motor deceleration with insufficient braking.

This fault occurs because the drive is unable to perform Automatic Motor Tuning (AMT). This could be due to the calculated motor resistance (RS) falling outside permitted limits, insufficient motor current in one or more phases, or the motor being too small for accurate AMT calculations. An incomplete AMT prevents optimal motor control and efficiency.

This fault indicates an inconsistency in the registered motor data that prevents successful Automatic Motor Tuning (AMT). The drive's internal checks have found a mismatch between the provided motor parameters and expected values, which can lead to incorrect motor characterization and suboptimal performance.

During Automatic Motor Tuning (AMT), the drive detected that the motor current in at least one of the motor phases is too low. This could be caused by an open circuit in a motor phase, a loose connection, a damaged motor winding, or a problem with the current measurement circuit. This prevents successful motor characterization.

This fault occurs because the motor connected to the drive is likely too small for the Automatic Motor Tuning (AMT) calculations to be carried out accurately. When the motor is undersized, the drive may struggle to generate sufficient current or torque for reliable tuning, leading to an inability to properly characterize the motor.

The drive is unable to perform Automatic Motor Tuning (AMT) on the connected motor. This indicates a fundamental incompatibility between the motor type and the AMT function, or that the motor parameters are so far off that the tuning cannot proceed. The drive cannot establish proper control without successful tuning.

This fault indicates that the Automatic Motor Tuning (AMT) calculations are taking too long to complete, resulting in a timeout. Common causes include excessive electrical noise in the motor cables, which can interfere with measurements, or conditions that prevent the tuning algorithm from converging quickly. An incomplete AMT means the motor will not be optimally characterized for the drive.

A warning condition has been triggered on the adjustable frequency drive while the Automatic Motor Tuning (AMT) process is underway. This indicates a non-critical issue that, while not immediately stopping the tuning, suggests suboptimal conditions. It could impact the accuracy or reliability of the AMT results.

The DC bus voltage (VDC) has dropped below the 'Voltage warning low' limit. The motor continues to operate, but if the VDC remains low for 2-25 seconds, the inverter will trip with an Alarm 8 (Undervoltage). This can be caused by an insufficient supply voltage or an unstable power source.

The DC bus voltage (VDC) has exceeded the inverter’s 'Overvoltage limit'. The inverter will switch off until VDC drops, but if it remains high for 5-10 seconds, it will trip with an alarm. This is typically caused by excessive supply voltage, or more commonly, by regenerative energy from the motor during rapid deceleration with insufficient ramp-down time.

The DC bus voltage is lower than the inverter’s 'Undervoltage limit'. The inverter will switch off until VDC recovers, but if it remains low for 1-3 seconds, it will trip with an alarm. This indicates that the incoming supply voltage is too low or unstable, potentially affecting drive operation.

The electronic thermal protection for the inverter indicates that the drive is close to disconnecting due to prolonged high output current. The internal counter gives a warning at 98% and trips at 100%. The drive cannot be reset until the counter drops below 90%.

The control panel functions of the drive have been locked via parameter 018. This feature is typically engaged to prevent unauthorized access or accidental parameter changes during normal operation, enhancing safety and system integrity. While a security measure, it prevents local adjustments.

This alarm indicates that the Automatic Motor Tuning (AMT) process, which identifies motor parameters for optimal control, has failed. This can happen due to incorrect motor wiring, mechanical issues, or unsuitable motor characteristics for the tuning process.

This alarm indicates an unspecified internal hardware or software fault within the adjustable frequency drive. It suggests a critical internal failure that prevents normal operation and often requires professional diagnosis or replacement.

This alarm indicates that the drive has entered a Trip-Locked state, meaning it cannot be reset by simply pressing the [STOP/RESET] key. This usually occurs after a severe fault to ensure safety and require manual intervention.