Danfoss VLT Micro

The parameter number specified in the Modbus request to Holding Register 0007 does not correspond to an existing parameter in the drive's memory map. This means an invalid or misspelled parameter was addressed via the communication interface.

An attempt was made to write to a parameter through Holding Register 0007 that is either inherently read-only or currently write-protected. This indicates a parameter that can only be viewed, or one that requires a specific operating state or access level for modification.

This fault indicates an issue during the drive's internal brake check procedure, suggesting a problem with the braking unit or its connection. This could prevent the drive from starting or safely stopping the motor, posing a risk of uncontrolled movement if the braking system is compromised.

The data value attempted to be written to a parameter through Holding Register 0007 exceeds the predefined minimum or maximum limits for that parameter. This protects the drive from receiving values that are out of its operational range or illogical, ensuring stable and safe operation.

This fault signifies that the temperature of the drive's power card, which contains critical components like IGBTs, has exceeded its safe operating limit. Overheating can lead to premature component failure, reduced drive lifespan, and unexpected shutdowns to prevent damage.

An attempt was made to access a sub-index of an array parameter through Holding Register 0007 that does not exist. This indicates an incorrect index number was provided when referencing an element within an array-type parameter, leading to an invalid memory access.

A value contained in the Modbus query data field is not an allowable value for the server (drive). This indicates a structural fault in the remainder of a complex request, such as an incorrect implied length. It does NOT mean a submitted data item is outside an application's expectation, as the Modbus protocol doesn't interpret specific register values.

An earth fault (ground fault) has been detected in the motor or the cabling between the drive and the motor. This indicates current leakage to ground, which is a serious safety hazard and can cause significant damage to the drive or motor if not resolved promptly.

The data type of the value being written (e.g., integer, float, text) through Holding Register 0007 does not match the expected data type of the parameter being called. This can lead to data corruption, misinterpretation, or a failure to apply the new setting correctly.

The intermediate DC link voltage within the drive has exceeded its maximum permissible limit. This condition can arise from regeneration from the motor, excessive input supply voltage, or very rapid deceleration ramp times, which can stress internal components.

This warning suggests that the drive is operating in a condition where it needs to reduce its output frequency or torque to maintain stable operation, often due to exceeding a current or voltage limit. While not an immediate trip, continued operation under these conditions can lead to a trip or reduced performance.

The drive has been subjected to a load exceeding 100% of its rated capacity for an extended period. This indicates that the motor or the application demands more power than the drive can safely provide without risking thermal damage to its power components.

This fault indicates that the drive has not received a valid control word via serial communication (e.g., Modbus RTU) within the configured timeout period. This typically means a break in communication, preventing the drive from receiving commands and potentially stopping the motor.

The motor's thermistor input indicates an over-temperature condition, or the thermistor or its connection is disconnected. This provides direct thermal protection for the motor, signaling a critical overheating risk if not addressed.

The motor's actual torque has exceeded the value set in either parameter 4-16 (Torque Limit Motor Mode) or 4-17 (Torque Limit Generator Mode). This is a protective function to prevent mechanical damage to the driven equipment or instability in the control system.

The inverter's peak current limit has been exceeded, indicating a sudden and excessive surge in current. This is a critical fault often caused by a short circuit in the motor or its cabling, or an extremely sudden and heavy load application, which can damage the drive's output stage.

A discharge (current leakage) from one or more output phases to ground has been detected. This indicates an insulation breakdown in the motor, the motor cables, or potentially the drive's output stage, posing an electrical safety hazard.

A short circuit has been detected in the motor windings or on the motor terminals. This is a severe fault that can cause immediate and catastrophic damage to the drive's output stage if not quickly and effectively protected against, representing a major electrical failure.

The parameter value attempted to be changed via Holding Register 0007 cannot be modified while the drive is in its current operational mode (e.g., running, powered down, specific control state). This protects against changes that could compromise operational stability or safety.

A general or unspecified error occurred while attempting to access a parameter through Holding Register 0007. This is a catch-all for errors not covered by more specific codes, indicating an unexpected issue during parameter interaction.

An overcurrent condition means the drive's output current to the motor has exceeded its maximum permissible limit. This is a critical fault that can damage the drive's power semiconductors (IGBTs) or the motor, and the drive will trip to protect itself.

The external brake resistor connected to the drive has developed a short circuit, disabling the brake function. This prevents the drive from dissipating regenerative energy, potentially leading to a DC overvoltage trip during deceleration.

The internal brake transistor (chopper) within the drive, which is responsible for switching the brake resistor, has short-circuited. This renders the regenerative brake function inoperative and can cause immediate faults or damage if the drive attempts to use it.

The brake resistor is either not connected to the drive, or it is not functioning correctly (e.g., open circuit). This means the drive cannot dissipate regenerative energy, potentially leading to DC overvoltage faults during deceleration if braking is required.

The heat-sink cut-out temperature of the drive's power board has been reached, indicating excessive internal temperature. This can be caused by high ambient temperature, blocked ventilation, sustained overload, or a malfunctioning cooling fan, risking damage to power components.

One of the motor output phases (Phase U) is detected as missing by the drive. This usually points to a disconnected motor cable, a broken wire, or a poor connection at either the drive or motor terminals, preventing proper motor operation.

One of the motor output phases (Phase V) is detected as missing by the drive. This typically indicates a disconnected motor cable, a broken wire, or a poor connection at either the drive or motor terminals, preventing proper motor operation.

One of the motor output phases (Phase W) is detected as missing by the drive. This usually points to a disconnected motor cable, a broken wire, or a poor connection at either the drive or motor terminals, preventing proper motor operation.

A general unspecific internal fault has occurred within the drive. This indicates a hardware or software malfunction that prevents normal operation and requires further investigation to determine the root cause, as it's a catch-all for various internal issues.

This fault indicates that the drive has reached its configured torque limit. This could be due to the motor trying to accelerate or run a load that exceeds the drive's or motor's torque capabilities, or it might be intentionally set to protect mechanical components. Prolonged operation at or above the torque limit can lead to instability or mechanical stress.

The internal 24 V DC control voltage supply in the drive is either overloaded or experiencing an issue. This can affect the reliable operation of the drive's control circuits and any external devices powered by this supply, potentially leading to unexpected behavior.

The Automatic Motor Tuning (AMT) process detected an incorrect setting for the motor's nominal voltage and/or nominal current parameters. This prevents accurate motor modeling and can lead to suboptimal motor control, protection, and efficiency.

During Automatic Motor Tuning (AMT), the detected motor current was too low, indicating an issue with the motor or its connection, or incorrect motor current parameter settings. This inhibits the drive from properly characterizing the motor.

The drive has reached its internal current limit due to an overload condition, similar to 'Inverter overloaded' but possibly indicating a different internal control loop limitation. This is a protection mechanism to prevent damage to the drive's power components.

The actual motor current failed to exceed the configured 'release brake' current within the specified 'start delay' time window. This indicates that the mechanical brake did not disengage as expected during the startup sequence, preventing the motor from moving.

This fault indicates that the motor's thermal model or external thermal sensor has detected an overheating condition. Continuous operation in an overheated state will degrade motor insulation, leading to premature motor failure and costly repairs or replacements. The drive trips to protect the motor.

Communication between the Local Control Panel (LCP) and the frequency converter has been lost. This prevents local control, monitoring, and parameter adjustment via the LCP, making it difficult to operate or troubleshoot the drive locally.

A button on the Local Control Panel (LCP) has been disabled, likely through a configuration in parameter group 0-4* LCP functions. This is a safety or operational feature to prevent unintended or unauthorized operation via specific LCP buttons.

An error occurred during the process of copying parameter settings either from the frequency converter to the LCP or vice versa. This can result in an incomplete or corrupted parameter set, leading to incorrect drive operation.

When attempting to copy parameters from the LCP to the drive, the LCP was found to contain erroneous or no valid data. This means the LCP data cannot be reliably transferred to the drive, preventing restoration of settings.

An attempt to copy parameters from the LCP to the drive (or vice versa) failed because the data stored in the LCP is not compatible with the software version of the frequency converter. This often happens when moving LCPs between drives with significantly different firmware versions.

An attempt was made to write a value to a parameter that is configured as read-only. This typically occurs when trying to change system information, diagnostic values, or parameters that can only be modified internally by the drive, protecting critical settings.

The drive's parameter database is currently occupied because both the Local Control Panel (LCP) and the RS485 communication (e.g., Modbus) are simultaneously attempting to update parameters. This prevents concurrent modifications to maintain data integrity.

An attempt was made to write an illegal or invalid value to a parameter, or the value is not permissible under the drive's current operating mode. This prevents incorrect settings from being applied that could lead to instability or unsafe operation.

An attempt was made to set a parameter value that falls outside its defined minimum or maximum limits. This is a common error when entering values manually via the LCP or programmatically via communication, protecting the drive from unsafe or illogical settings.

This fault signifies that the drive's Electronic Thermal Relay (ETR) function for motor protection has detected an overload condition based on the motor's current and thermal model. This indicates the motor is experiencing prolonged high current, leading to potential overheating and damage if not addressed.

The parameter attempted to be accessed through the communication bus (e.g., Modbus) via Holding Register 0007 is either not configured for bus access or is specifically restricted from external modification or readout. This ensures certain parameters can only be adjusted locally.

This fault occurs when the drive's internal power components (inverter section) are drawing excessive current for an extended period, indicating an overload on the drive itself. This can lead to overheating and damage to the IGBTs or other power electronics if the condition persists.

This fault indicates that the DC link voltage within the drive has dropped below a safe operating threshold. This can be caused by an unstable or lost input power supply, severe voltage sags, or an internal fault in the drive's rectifier section. The drive cannot operate reliably with insufficient DC link voltage and will trip to protect itself.

An incorrect password was entered when attempting to access or modify a password-protected parameter or menu on the LCP. This security feature prevents unauthorized configuration changes to the drive, ensuring operational integrity.

An attempt was made to change a parameter that can only be modified when the motor is stopped. This protection mechanism prevents configuration changes that could cause instability, erratic behavior, or damage to the motor or driven equipment during operation.