Vacon NXP AFE-II Drive

The drive has detected an abnormally high current in one of the output phases, exceeding a hardware trip limit of 4 times the nominal current (Ih). This indicates an immediate and severe electrical overload condition. If left unresolved, it can lead to component damage or system instability.

The drive has detected a missing input line phase, as indicated by phase supervision for both diode supply (S1) and active front end (S2). This means one or more incoming power phases are not present or severely degraded. Running with a missing phase can cause damage to the drive and connected equipment.

The current measurement system has detected an imbalance where one phase current is either missing or significantly different from the other phases. This indicates an issue with the power delivery to the motor. Operating with unbalanced phases can lead to motor overheating and drive component stress.

The heatsink temperature of the drive has fallen below an acceptable operating limit, specifically under –10°C. Operating at excessively low temperatures can affect the performance and lifespan of electronic components.

The heatsink temperature of the drive has exceeded its acceptable operating limits, triggering a fault. An overtemperature warning typically precedes the actual trip limit. Sustained high temperatures significantly reduce the lifespan of power semiconductors and other internal components.

The DC-link voltage has surpassed the drive's protective limits (e.g., above 911 Vdc for a 500 Vac unit or 1200 Vdc for a 690 Vac unit). This can be a hardware trip or sustained overvoltage due to control supervision. Persistent overvoltage can damage power components and reduce drive lifespan.

An error has occurred with the EEPROM checksum, indicating a parameter save fault, faulty operation during data storage, or a component failure within the EEPROM memory. This can lead to incorrect drive configuration.

The values displayed on the internal counters of the drive are incorrect or corrupted. This affects the accuracy of operational data logging.

The drive's internal watchdog timer has detected an issue preventing normal microprocessor operation or startup. This can occur if the drive startup is prevented or a run request is active while a new application is being loaded. This fault indicates a critical internal control issue.

The drive's startup sequence has been prevented, possibly because a run request was active while a new application was being loaded. This is a safety measure to prevent unintended operation during critical configuration changes.

The thermistor input on the option board has detected an excessively high motor temperature. This fault can be caused by motor overheating or a broken thermistor cable. Continued operation with an overheated motor can lead to winding damage.

The earth fault protection ensures that the sum of the output phase currents is not zero, indicating a current leakage to ground. This protection works in conjunction with overcurrent protection for high current earth faults. An unaddressed earth fault poses a significant safety hazard and can cause severe damage to the drive or motor.

The IGBT Inverter Bridge over-temperature protection has activated due to an excessively high short-term overload current. This indicates the power semiconductors are being stressed beyond their safe operating limits. Repeated trips can degrade the IGBTs.

An option board of a different type has been added to the drive, causing the drive to load default parameters. This indicates a change in hardware configuration that requires re-parameterization.

The current at an analog input has dropped below the 4mA supervision limit. This typically indicates a failure in the signal source, a broken control cable, or a loose connection within the current loop circuitry. This means the drive is not receiving expected sensor feedback.

A digital input configured for external fault monitoring has been activated, signaling a fault condition from an external device or system. This is a generic fault triggered by an external safety or monitoring circuit.

The communication link between the control keypad (or NCDrive software) and the AC drive has been interrupted or broken. This prevents control and monitoring via the keypad interface.

The data connection between the fieldbus Master and the fieldbus option board installed in Slot D has been broken. This results in a loss of communication with the control system.

This fault indicates a problem with an option board or the slot it is installed in, suggesting either a defective board or an issue with the slot's electrical connection.

The temperature protection function for sensor board 1 has detected an issue, which could be an exceeded temperature limit, an unwired or non-functional sensor, or a short circuit in the sensor wiring (A1-A3 conditions). This compromises temperature monitoring.

For liquid-cooled units, this protection detects a failure in the cooling liquid circulation, typically via an external sensor connected to the Cooling Monitor digital input. It generates a warning when the drive is stopped and a fault (with a coast stop) when running. Continued operation without proper cooling will lead to severe overheating.

The Main Circuit Breaker (MCB) state is inconsistent with the drive's command. This includes scenarios where the MCB opens when commanded to close, closes when commanded to open, opens externally while the AFE unit is running, or is in a tripped state as reported by a digital input. This is a critical safety and operational fault.

The temperature protection function for sensor board 2 has detected an issue, which could be an exceeded temperature limit, an unwired or non-functional sensor, or a short circuit in the sensor wiring (A1-A3 conditions). This compromises temperature monitoring.

The data connection between the fieldbus Master and the fieldbus option board installed in Slot E has been broken. This results in a loss of communication with the control system.

The LCL (Line Commutated Inductor) temperature has reached its warning limit, indicating elevated temperatures within the input filter components. While currently a warning, it suggests conditions that could lead to an over-temperature fault if unaddressed.

The drive failed to reach the required DC voltage within the set charging time for the Main Circuit Breaker (MCB). This can be due to a non-operational charging circuit, a high load on the DC link during charging, or an insufficient supply voltage for the charging circuit. This prevents the drive from starting up properly.

This fault is triggered by a digital input fault, indicating a problem related to the main fuse. It's an external input signaling a main fuse issue. This could mean the main fuse has blown or its monitoring circuit has an error.

This fault is triggered by a digital input fault, signaling an issue with the auxiliary voltage supply. This suggests a problem with the external auxiliary power source or its monitoring.

This fault is triggered by a digital input, indicating that a safe stop command or condition has been activated from an external device. This is a critical safety interlock.

This fault is triggered by a digital input fault, indicating an insulation problem detected by an external monitoring device. This points to a potential electrical leakage somewhere in the system.

This fault is triggered by a digital input fault, indicating an issue with the earth switch. This suggests the earth switch may be in an incorrect state or its monitoring circuit has an error.

This fault is triggered by a digital input fault, signaling an excessively high ambient temperature detected by an external sensor. This indicates the operating environment is too hot for the drive.

This fault is triggered by a digital input fault, indicating an electrical leakage detected by an external monitoring device. This is a general leakage indication from an external system.

The DC-link voltage has dropped below acceptable limits, potentially triggering an undervoltage control supervision (S3). This could be caused by a low supply voltage, an internal frequency converter fault, a broken input fuse, or an open external charge switch. Prolonged undervoltage can cause erratic drive behavior and component stress.