Vacon X4 AC Drive

This fault indicates an internal microprocessor problem (sub-codes 0, 1, 2) or an incorrect thermistor profile (sub-code 3). These issues point to a fundamental problem with the drive's internal control system that cannot be resolved through basic troubleshooting. The drive requires specialized attention.

This fault occurs when the drive has attempted to automatically restart after a fault more times than permitted by the customer-defined parameter for fault restarts. This safety feature prevents continuous, unsuccessful restarts that could damage equipment or worsen an underlying, recurring problem. Manual intervention is required.

The drive has detected a current imbalance between its output phases, and this imbalance is determined to be current flowing to ground. This is a critical fault indicating a direct path to ground from the motor or motor cabling. It poses an electrical hazard, potential equipment damage, and could trip upstream protective devices.

This fault is triggered when the drive detects a significant voltage imbalance between its input phases or a complete loss of one phase (single-phase condition) while operating under load. Such conditions can lead to excessive current draw, overheating of input components, and potential damage to the drive's input rectifier and DC bus.

This fault signifies an overvoltage condition detected on the load (motor) side during power-up. While related to input overvoltage, this advanced code might point to an issue specific to the motor connection or residual voltage on the motor leads. High voltage can damage the motor insulation or the drive's output stage.

This fault indicates a general malfunction within the Dynamic Braking (DB) circuit detected immediately upon drive power-up, and it is not auto-resettable. This suggests a significant internal component failure or wiring issue within the braking chopper or its control. This fault prevents the drive from starting and operating safely.

This fault indicates that the drive detected an overcurrent condition during normal operation, meaning the motor current exceeded the safe operating limits of the drive's power devices. This can be caused by excessive mechanical load, incorrect motor parameters, sudden load changes, or mechanical binding. This trips the drive to protect itself and the motor.

This fault indicates a problem with the control board temperature sensor (thermistor) or its connection. The drive cannot accurately monitor the control board temperature, which could lead to undetected overheating and damage to critical control components. This compromises the drive's ability to protect itself.

This fault indicates a memory problem, such as an issue during reflashing, a conflict within the drive's memory, or an inability to write parameters. It can also occur if Modbus write requests are too frequent, overwhelming the drive's processing capability. This typically suggests corrupted memory or communication overload.

This fault signifies that the motor connected to the drive has experienced an overload condition exceeding the customer-defined overload settings. Sustained operation above the motor's rated current can lead to winding damage, reduced motor lifespan, or premature motor failure. The drive tripped to protect the motor.

This fault is triggered when the heatsink temperature drops below -10.0 degrees Celsius. Operating the drive outside its specified low-temperature limits can affect the performance and reliability of internal components, particularly electrolytic capacitors and LCD displays. This prevents safe operation and could cause damage.

This fault occurs when the drive's configured analog input signal, typically for speed or frequency reference, falls below a specified minimum level set by customer parameters. This indicates a loss or degradation of the command signal, potentially leading to uncontrolled operation or shutdown. The drive cannot receive proper commands.

This fault indicates an open circuit detected in the potentiometer wiring used for control. When the potentiometer circuit opens, the drive loses its reference signal, which can lead to the motor stopping, uncontrolled acceleration, or unpredictable behavior. This is a safety feature to prevent erratic operation.

This fault indicates an issue with the keypad or its connection where the drive is unable to write data to the keypad's LCD display. This prevents the display of status, parameters, or fault information to the user, effectively rendering the local interface unusable for monitoring or configuration.

This fault indicates a loss of communication when the drive is operating via a serial link. The time elapsed since the last Modbus communication exceeded the limit set in parameter 903 (SIO Timer). This can prevent external control or monitoring of the drive.

This fault occurs if the drive takes more time to decelerate the motor to a stop than is allowed. The timeout is determined by the longest deceleration ramp time (Decel1 or Decel2) plus the Regen Timeout parameter. This typically indicates an excessive amount of regenerative energy during deceleration.

The drive has detected a failure in its output power devices, such as IGBTs or diodes within the power bridge. This critical fault can lead to uncontrolled motor operation, damage to the motor, or complete drive failure. It may also indicate a problem with the input power section.

This fault occurs when the drive detects an overload condition that surpasses its specified rating for a sustained period. For normal duty, the drive is rated for 120% of nameplate current for 60 seconds, and for heavy duty, 150% for 60 seconds. Sustained overload can damage the drive's internal power components.

This fault is triggered if the drive detects a persistent key press during power-up. This can be caused by a faulty keypad button or a user inadvertently holding a key down while powering on the drive. This prevents proper initialization and operation via the keypad.

This fault indicates a problem with the current calibration on one of the motor phases (T1/U, T2/V, or T3/W). This typically points to an issue with the motor connections or the motor itself, or an internal drive problem related to current measurement accuracy. Improper calibration can lead to inaccurate motor control.

This fault indicates that a customer-defined parameter has been set to a value outside its permissible range. This can lead to unexpected drive behavior, incorrect motor control, or prevent proper operation. An invalid parameter can compromise system safety and performance.

This fault occurs if an IOC (Internal Overcurrent) fault is detected during the power wiring test, indicating a problem with the drive's power wiring. This signifies a serious wiring discrepancy or an internal component issue that could lead to immediate overcurrent conditions and damage.

This fault indicates that the drive has detected an undervoltage condition or power dip, which it could not ride through. Depending on parameter 501 settings (Coast Stop or Controlled Stop), the drive will either coast to a stop or decelerate the motor before faulting. This protects the drive and motor from operation with insufficient input power.

This fault occurs when the drive is configured for single-phase operation (parameter 517), and the DC bus voltage ripple exceeds the drive's allowable limits. This indicates the input power demand is too high for the drive's capacity in single-phase mode. This can lead to drive instability and potential damage if overloaded.

This fault indicates that the drive was unable to properly measure the motor's stator resistance, a crucial step for accurate motor control (especially in vector modes). This can be due to poor motor connections, a faulty motor, or an internal issue with the drive's measurement circuits. Inaccurate measurement will affect motor performance.

For X5 AC Drives, this fault is user-configurable (User Flt 1), indicating a condition defined by the system integrator or user as a critical error. The specific cause depends entirely on the application's programming. For X4 AC Drives, this fault signifies a 'Fan Loss', indicating a problem with the heat sink or internal cooling fan, which could lead to overheating if unresolved.

This is a user-configurable fault, indicating a condition defined by the system integrator or user as a critical error. The specific cause depends entirely on the application's programming and external conditions triggering this fault. It requires investigation of the specific machine logic.

This fault indicates a problem with the motor encoder, which could be an overspeed condition, improper setup, or a general malfunction. Accurate encoder feedback is crucial for precise motor control and speed regulation, especially in closed-loop applications. Incorrect feedback can lead to unstable operation.

This fault indicates that the drive's internal 5V supply has dropped below 4 Vdc for over 100 milliseconds, suggesting an issue with the internal power regulation for control circuits. This can be caused by excessive load on the 5V supply or wiring problems to external devices connected to the REF terminals.

This fault indicates a short circuit has been detected, either during power-up or during normal operation. This is a critical fault indicating excessive current flow, often due to wiring issues or a faulty motor. Such a condition can severely damage the drive's power output stage if not immediately addressed.

This fault occurs when the Motor Overload (MOL) digital input is activated, indicating an overload condition detected externally or a misconfiguration of the input logic. The MOL input acts as a safety interlock to protect the motor from damage due to excessive thermal or current loading.

This fault indicates that the control board is unable to properly read the drive's internal model identification data. This could signify a fundamental hardware issue with the control board or the drive's ID chip. The drive may not operate correctly or at all due to incorrect parameter loading or protection settings.

This fault occurs when the drive detects an undervoltage condition and is configured for 'Controlled' power loss response via parameter 525. The drive decelerates the motor while attempting to regulate the bus voltage, but faults if it reaches a stopped condition. This signifies a sustained undervoltage that exceeds the drive's ride-through capability, leading to a controlled shutdown.