Allen-Bradley PowerFlex 4

The DC bus voltage remained below 85% of nominal for longer than the configured [Power Loss Time]. This indicates a sustained sag or interruption of the incoming AC line power. This fault can be enabled/disabled with [Fault Config 1].

The DC bus voltage has fallen below the minimum threshold (407V DC for 400/480V input, or 204V DC for 200/240V input). This fault indicates an insufficient incoming AC line voltage or a momentary power interruption. This condition can be enabled or disabled via [Fault Config 1] (page 1-46) based on application needs.

The DC bus voltage has exceeded its maximum permissible value. This can be caused by high incoming AC line voltage, transient voltage spikes, or regenerative energy from a decelerating motor, risking damage to the drive's DC bus capacitors.

The heatsink temperature exceeds 100% of the [Drive Temp] threshold. This indicates that the drive's cooling system is unable to dissipate heat effectively, risking thermal damage to the power components.

The output transistors have exceeded their maximum operating temperature. This indicates that the power semiconductors are overheating, which can lead to premature failure of the drive.

A current path to earth ground greater than 25% of the drive rating has been detected on the output. This indicates an insulation breakdown or short circuit between the motor phases or wiring and ground, which is a severe safety and equipment risk.

The difference between the [Commanded Speed] and [Encoder Speed] has exceeded the level set in [Spd Dev Band] for a time period greater than [Spd Band Integrat]. This indicates that the motor is not following the speed command accurately, likely due to a mechanical issue or encoder problem.

Current in one or more output phases has been lost or remains below a preset level. This indicates an open circuit condition between the drive and the motor, or a motor winding issue, which can lead to motor overheating or unstable operation.

The drive is not following a commanded deceleration because it is attempting to limit bus voltage. This indicates the DC bus voltage is rising due to regenerative energy, potentially exceeding safe limits and causing the drive to inhibit deceleration.

Functions like Slip Compensation or Bus Regulation have attempted to add an output frequency adjustment greater than that programmed in [Overspeed Limit]. This occurs when the drive tries to exceed its configured maximum speed due to an external force (overhauling load) or control algorithm, potentially leading to instability.

This Alarm 2 indicates that the TorqProve feature (P1100) is enabled, but critical feedback parameters (P35, P125, P135) are improperly configured or incompatible with the requirements for TorqProve. It also doesn't function with open loop, simulation feedback, PM FV mode, or certain encoder types. The drive cannot start until these configuration errors are corrected, as they compromise the safety and functionality of the TorqProve feature.

This Alarm 2 indicates that Encoderless TorqProve has been enabled, but the specific application concerns, limitations, and risks associated with operating TorqProve without an encoder have not been reviewed or acknowledged. The drive cannot start due to this unaddressed configuration risk. It is crucial to understand these limitations to ensure safe operation.

An analog input is configured to fault on signal loss, and a signal loss has occurred. This condition can be configured and monitored using parameters like [Anlg In 1, 2 Loss] on page 1-55. The root cause is typically a missing or interrupted input signal.

This is a predictive maintenance alarm indicating that Relay 0 is approaching or has exceeded its expected operational lifespan. It serves as an early warning for potential component failure. If this warning is ignored, the relay could fail unexpectedly, leading to drive stops or loss of control functionality, requiring unplanned downtime for replacement.

The drive has repeatedly attempted to automatically reset a fault and resume operation but has failed to clear the underlying condition within the programmed number of tries (P348 [Auto Rstrt Tries]). This indicates a persistent problem that the drive cannot self-correct, leaving it in a stopped state. Manual intervention is required to diagnose and fix the root cause of the original fault.

This fault indicates that the drive has exceeded the configured number of auto-clear fault retries (P338 [AutoClrFlt Tries]) without successfully clearing a persistent fault while the drive was in a stopped state (provided P347 [Auto Retry Fault] bit 1 is set). This means automatic attempts to clear a fault have failed, and the drive remains non-ready, requiring manual diagnosis and correction of the original fault condition.

The current magnitude has exceeded the trip level set by P1640 [IPM Max Cur], as detected by the Intelligent Power Module (IPM). This fault protects the drive from severe damage due to excessive current. If persistent, it strongly indicates an overload, a short circuit condition in the motor or wiring, or an incorrect setting of P1640.

The drive output current has exceeded its 1 ms software current rating, which is a very fast-acting protection mechanism. This rating is typically between 200-250% of the drive's continuous rating and less than the hardware overcurrent level. This fault indicates a severe and rapid transient overload or a hard short circuit on the motor output terminals, protecting the drive's output stage from immediate damage.

A phase-to-ground fault has been detected between the drive and the motor on output phase U. This indicates insulation breakdown or a direct short from output phase U to earth. This condition poses a significant risk of electrical shock and can cause severe damage to both the drive and the motor if not quickly identified and resolved.

A phase-to-ground fault has been detected between the drive and motor on output phase V. This indicates a severe insulation breakdown or short circuit between phase V and earth ground, posing a safety hazard and risk of equipment damage.

A phase-to-ground fault has been detected between the drive and motor on output phase W. This indicates a severe insulation breakdown or short circuit between phase W and earth ground, posing a safety hazard and risk of equipment damage.

Excessive current has been detected between output terminals U and V. This indicates a short circuit condition between these two motor phases or their connecting wiring, leading to very high currents and potential drive damage.

Excessive current has been detected between output terminals V and W, indicating a direct short circuit condition between motor phases V and W. This fault causes extremely high currents and will severely damage the drive's output transistors and the motor windings if not immediately resolved. Prompt investigation of wiring and motor integrity is crucial.

Excessive current has been detected between output terminals U and W. This indicates a short circuit condition between these two motor phases or their connecting wiring, leading to very high currents and potential drive damage.

A phase-to-ground fault has been detected between the drive and the motor on output phase U, specifically identifying a negative voltage transient or specific ground path. This indicates insulation breakdown or a short from output phase U to earth. This condition can damage the drive and motor if not quickly addressed, and poses an electrical safety risk.

A phase-to-ground fault has been detected between the drive and the motor on output phase V, specifically identifying a negative voltage transient or specific ground path. This indicates insulation breakdown or a short from output phase V to earth. This condition can damage the drive and motor if not quickly addressed, and poses an electrical safety risk.

A phase-to-ground fault has been detected between the drive and the motor on output phase W, specifically identifying a negative voltage transient or specific ground path. This indicates insulation breakdown or a short from output phase W to earth. This condition can damage the drive and motor if not quickly addressed, and poses an electrical safety risk.

The drive was commanded to write default values to its EEPROM memory. This is a confirmation that a parameter reset has occurred, not an operational fault itself.

No fault displayed. This entry is used as a Power Up Marker in the Fault Queue, indicating that the drive power has been cycled. It signifies a power cycle event rather than an operational fault.

No fault displayed. This entry is used as a marker in the Fault Queue, indicating that the clear queue function was performed. It records the action of clearing the entire fault history.

No fault displayed. This entry is used as a marker in the Fault Queue, indicating that the fault clear function was performed. It notes a historical event rather than an active operational fault.

The temperature sensor on the Main Control Board has detected an excessive heat condition, exceeding safe operating limits. This indicates that the control electronics are overheating, which can lead to instability or damage to the drive. Possible causes include inadequate cooling or a high ambient temperature.

The programmed [Current Lmt Val] has been exceeded. This indicates that the motor load has caused the drive output current to surpass a set limit, often used to protect mechanical components like a shear pin. This fault can be enabled/disabled with [Fault Config 1].

The drive's output current rating of 110% for 1 minute or 150% for 3 seconds has been exceeded. This indicates the drive is being asked to supply more current than its continuous or short-term rating, risking thermal damage to the drive's power section.

The measured resistance of the internal Dynamic Braking (DB) resistor is outside its specified operating range. This could indicate a damaged or incorrect braking resistor, preventing effective energy dissipation during deceleration. A faulty DB resistor can lead to overvoltage trips or poor braking performance.

One or more of the output transistors were operating in the active region instead of desaturation. This can be caused by excessive transistor current or insufficient base drive voltage, indicating a failure within the drive's output power stage.

The communications card associated with DPI ports 1-5 has a fault. This indicates an issue with the internal communication hardware or the connected DPI device.

The value for flux amps determined by the Autotune procedure exceeds the programmed [Motor NP FLA] parameter. This indicates a discrepancy between the motor's actual flux current characteristics and the configured nameplate full load amperage, possibly due to incorrect motor data entry or an improperly sized motor.

The motor did not come up to speed in the allotted time during an autotune procedure. This indicates the motor or connected load is preventing the autotune from completing successfully, potentially due to high friction or an oversized load.

The Autotune function was canceled prematurely, either due to user intervention or because another fault occurred during the tuning process. This prevents the drive from completing the motor tuning sequence, which can lead to suboptimal motor control and performance issues. A successful autotune is critical for efficient drive operation.

A DPI port has stopped communicating, or a SCANport device was connected to a drive operating DPI devices at 500k baud. This indicates a loss of communication with a connected DPI device, which can prevent control commands or feedback from reaching the drive. The fault code varies depending on which port (1-5) lost communication.

A microprocessor handshake error has occurred. This indicates an internal communication or processing issue within the drive's control software/hardware, preventing proper execution.

A microprocessor handshake error has occurred. This indicates an internal communication or processing issue within the drive's control software/hardware, preventing proper execution.

Both encoder channels (A and B) changed state within a single clock cycle. This suggests an issue with the encoder signal quality, possibly due to electrical noise or a damaged encoder, causing incorrect speed or position feedback.

Requires a differential encoder. One of the two encoder channel signals (e.g., A or B) is missing. This indicates a problem with the encoder feedback, which is critical for precise motor control, leading to loss of speed or position regulation.

The Z Channel is selected as a pulse input, and no signal is present. This indicates a loss of feedback from a pulse generator connected to the Z Channel input, critical for applications requiring pulse-based speed or position control.

The hardware enable input is disabled (logic pin is low) despite being jumpered high. This indicates a contradiction in the hardware enable status, preventing the drive from operating.

This fault indicates a problem with the drive's feedback system, where either the tach switch has occurred while the alternate feedback device failed, or the tach switch has not occurred, the Auto Tach Switch option is enabled, and both primary and alternate devices have failed. This condition directly impacts speed control and feedback integrity, potentially leading to unstable operation or unexpected drive behavior if not resolved.

The checksum read from the non-volatile storage does not match the checksum calculated, indicating a potential corruption in the drive's stored parameters. The data is automatically set to default values, leading to loss of configured settings. This can result in incorrect drive operation and requires re-commissioning if not properly addressed.

The calculated checksum of User Set 1 parameter data does not match the stored checksum. This indicates that the saved user parameters for User Set 1 are potentially corrupted or have been altered. This can lead to the drive operating with unintended or incorrect settings if the corrupted set is loaded.

An internal data error in the non-volatile storage (NVS) is detected, implying that the NVS is not in its expected blank or clean state. This condition can prevent proper drive initialization or parameter loading. If left unresolved, the drive may fail to start, retain configuration, or operate reliably.

This internal data error relates to an incompatibility or corruption in the power-down non-volatile storage data. It suggests an issue with how the drive saves and retrieves its state or parameters during power cycles. Without resolution, the drive's stability during power transitions and its ability to recover its operational state could be compromised.

The checksum read from the power board's non-volatile storage does not match the calculated checksum, indicating data integrity issues on the power board. This causes the power board's internal parameters to revert to default values. If these default settings are unsuitable for the application, it can lead to incorrect drive operation.

The checksum read from the power board does not match the calculated checksum. This indicates an internal hardware issue with the power board's memory integrity.

The main control board (MCB) did not recognize the power structure (PB), indicating a firmware or hardware incompatibility, or a communication issue between the two boards. This prevents proper drive initialization and operation. The drive will not be able to function until the firmware revisions are harmonized.

This fault occurs when the main control board has been moved to a different power structure, causing all stored data to reset to default values. It signifies that the drive requires a complete re-commissioning. Failure to re-enter application-specific parameters will result in incorrect or no drive operation.

The checksum read from the drive's analog calibration data does not match the checksum calculated. This indicates a corruption in the internal calibration data, which affects the accuracy of analog signal processing. The drive requires a hardware replacement to resolve this internal data inconsistency.

Invalid power structure data has been detected, indicating that information received from or stored within the power board is corrupt or unreadable. This prevents proper identification and control of the drive's power section. This directly disables the drive and could point to a communication or hardware issue between the main control board and power interface.

The power structure ID is invalid, meaning the main control board cannot correctly identify the connected power structure. This suggests a communication issue or a fundamental mismatch between the boards. The drive cannot start or operate safely without proper identification of its power components, leading to a shutdown.

This fault indicates that the power structure requires a newer Application revision to be compatible with the main control board. The firmware on the power structure is outdated or incompatible, preventing correct drive operation. The drive will not function until the power board firmware is updated to the required version.

An internal data error affecting tracking data has occurred. This is a generic data integrity issue, potentially compromising the drive's ability to store or retrieve critical operational tracking information. Such errors can lead to unpredictable drive behavior or loss of diagnostic capabilities if left unresolved.

This internal data error indicates that a power-down data table is full. This suggests an overflow or corruption in a system table used for handling power loss events or storing critical state information. This could lead to incorrect drive behavior or state recovery after power cycles.

An internal data error indicates that a power-down entry is too large. This implies an issue with data structure integrity in the non-volatile memory, specifically concerning entries related to power-down state saving. Such errors can lead to data corruption or incorrect drive state restoration upon power-up.

An internal data error indicating a checksum mismatch for power-down data. This means the critical data stored for system recovery after a power cycle is corrupt. This could lead to incorrect system recovery or parameter loading, compromising drive stability and reliable operation.

This internal data error specifically relates to the power board's power-down checksum, suggesting corruption in the power board's stored state or parameter data used during power cycles. This impacts safe power cycling and could lead to incorrect operation of the power section upon restart.

The application firmware on the main control board has been updated or changed. While not necessarily an error, this fault indicates a firmware revision discrepancy that requires verification. Ensure that the new firmware is compatible with the existing configuration and application to avoid operational issues.

The primary application firmware flash operation failed, and the drive is currently running on a backup application. This signifies a critical issue with the primary firmware's integrity. The drive is operating in a degraded state and requires immediate re-flashing of the application firmware to ensure full functionality and reliability.

A gate array load error has occurred within the drive's control hardware. This indicates an internal hardware issue, specifically with the programmable logic device, which can halt drive operation.

A dual port failure has occurred within the drive's control hardware. This indicates an internal communication or memory issue, likely on the control board, which can lead to system malfunction.

The drive has detected an incompatible power supply for the drive AC input rating on port 1. This can lead to improper operation or damage if not addressed.

The power supply on the U-phase gate driver board has failed. This affects the control of the U-phase output and can lead to motor malfunction or drive damage.

An attempt to flash the FPGA configuration device on port 1 has failed. This indicates a problem with the firmware update process, potentially leaving the device in an inoperable state.

This fault is asserted when the DC bus voltage drops to 80% of its rated value on port 1. This indicates a significant loss of DC bus voltage which can lead to drive shutdown and loss of control.

The drive has detected an incompatible power supply for the drive AC input rating on port 2. This can lead to improper operation or damage if not addressed.

The power supply on the U-phase gate driver board has failed. This affects the control of the U-phase output and can lead to motor malfunction or drive damage.

An attempt to flash the FPGA configuration device on port 2 has failed. This indicates a problem with the firmware update process, potentially leaving the device in an inoperable state.

This fault is asserted when the DC bus voltage drops to 80% of its rated value on port 2. This indicates a significant loss of DC bus voltage which can lead to drive shutdown and loss of control.

The drive has detected an incompatible power supply for the drive AC input rating on port 3. This can lead to improper operation or damage if not addressed.

The power supply on the U-phase gate driver board has failed. This affects the control of the U-phase output and can lead to motor malfunction or drive damage.

An attempt to flash the FPGA configuration device on port 3 has failed. This indicates a problem with the firmware update process, potentially leaving the device in an inoperable state.

This fault is asserted when the DC bus voltage drops to 80% of its rated value on port 3. This indicates a significant loss of DC bus voltage which can lead to drive shutdown and loss of control.

The DC bus voltage did not meet the conditions required to close the molded case switch (MCS) within the timeout period for port 1. This includes ensuring the DC bus input is not overvoltage or undervoltage, and the DC bus delta voltage (Vbus_in - Vbus_out) is less than 25V. Failure to precharge can prevent the drive from starting.

The DC bus voltage on port 1 has dipped more than 180V below the drive's bus memory when the drive is offline or in stand-alone mode. This indicates an unstable DC bus voltage, which can affect drive reliability.

240V AC input power was lost on port 1 while the drive was in an active state (e.g., MCS opening, closing, or closed). This causes the drive to cease operation.

The 240V AC disconnect switch on port 1 is open when the precharge controller is in the ready state, but the molded case switch (MCS) is not closed. This prevents the drive from starting or operating.

The DC bus voltage did not meet the conditions required to close the molded case switch (MCS) within the timeout period for port 2. This includes ensuring the DC bus input is not overvoltage or undervoltage, and the DC bus delta voltage (Vbus_in - Vbus_out) is less than 25V. Failure to precharge can prevent the drive from starting.

The DC bus voltage on port 2 has dipped more than 180V below the drive's bus memory when the drive is offline or in stand-alone mode. This indicates an unstable DC bus voltage, which can affect drive reliability.

240V AC input power was lost on port 2 while the drive was in an active state (e.g., MCS opening, closing, or closed). This causes the drive to cease operation.

The 240V AC disconnect switch on port 2 is open when the precharge controller is in the ready state, but the molded case switch (MCS) is not closed. This prevents the drive from starting or operating.

The DC bus voltage did not meet the conditions required to close the molded case switch (MCS) within the timeout period for port 3. This includes ensuring the DC bus input is not overvoltage or undervoltage, and the DC bus delta voltage (Vbus_in - Vbus_out) is less than 25V. Failure to precharge can prevent the drive from starting.

The DC bus voltage on port 3 has dipped more than 180V below the drive's bus memory when the drive is offline or in stand-alone mode. This indicates an unstable DC bus voltage, which can affect drive reliability.

240V AC input power was lost on port 3 while the drive was in an active state (e.g., MCS opening, closing, or closed). This causes the drive to cease operation.

The drive is currently operating normally, and no fault condition is present. This is an informational status indicating that the system is stable and functional. No intervention is required.

An external trip input (Auxiliary) has been activated, signaling an issue from an external device or safety circuit. This causes the drive to trip, protecting itself and connected machinery. This input is configurable via digital input parameters.

This fault indicates an issue with the auxiliary input signal. This input is typically configured via parameter A051 or A052 (Digital In1 Sel/Digital In2 Sel) with option 3 ('Aux Fault'). It signals an abnormal condition detected by the auxiliary input circuit.

Single-phase operation has been detected, combined with an excessive load on the motor. This condition typically arises from a lost phase on the incoming AC line or a severe voltage sag, causing the drive to struggle under load. It can lead to motor and drive overheating if unresolved.

This fault occurs when the drive detects a low voltage condition or an interruption on the incoming AC power line. This can lead to unstable operation or unexpected shutdowns.

The DC bus voltage within the drive has dropped below its minimum acceptable threshold. This usually occurs due to an insufficient incoming AC line voltage, sags, or momentary power interruptions. Prolonged undervoltage can cause erratic drive behavior or component stress.

This fault is triggered when the incoming AC line voltage drops below the drive's acceptable operating range. This can be caused by a sustained low voltage condition or a momentary power sag. This is an Auto-Reset/Run type fault configurable with parameters A092 and A093.

The DC bus voltage has exceeded its maximum safe limit. Common causes include excessively high incoming AC line voltage, transient voltage spikes, or regenerative energy from the motor during rapid deceleration. Persistent overvoltage can damage the drive's internal power components.

This fault indicates that the DC bus voltage within the drive has exceeded its maximum allowable limit. Common causes include high incoming AC line voltage, transient voltage spikes, or regenerative energy from the motor, especially during rapid deceleration. Regenerative energy occurs when the motor acts as a generator, feeding power back into the drive. Ignoring this fault can lead to premature component degradation or catastrophic failure of the drive's power section.

The drive is unable to successfully accelerate or decelerate the motor to the commanded speed, indicating a motor stall condition. This typically happens when the mechanical load is too high, or acceleration/deceleration ramps are set too aggressively, causing the output current to exceed limits for an extended period. This risks motor and drive damage from overheating.

This fault occurs when the drive is unable to accelerate the motor to its commanded speed within the programmed acceleration time. It typically signifies that the motor is experiencing an excessive mechanical load, or the acceleration time is set too aggressively for the current load. The drive attempts to provide enough current but hits its current limit (A441 [Current Limit]) before the motor reaches the desired speed. Repeated stalling can lead to motor and drive overheating and wear.

An internal electronic overload trip has been activated, signifying that the motor has experienced sustained excessive current beyond its programmed overload limit. This condition indicates an excessive mechanical load or incorrect motor parameters, risking motor overheating and permanent damage.

This fault indicates an excessive motor load condition, where the motor's operating current has exceeded the thermal overload limit set by parameter P033 [Motor OLCurrent] for a sustained period. This protects the motor from overheating and damage.

The temperature of the drive's heatsink or power module has risen above its predefined safe operating threshold. This indicates inadequate cooling for the power components, potentially caused by environmental factors, blocked airflow, or a faulty cooling fan. Sustained overheating shortens component lifespan.

This fault is triggered when the temperature of the drive's heatsink exceeds its safe operating limit. Overheating can be caused by restricted airflow, accumulation of dust and debris on the heatsink fins, a malfunctioning cooling fan, or an ambient temperature that is too high for the drive's specified enclosure rating. Prolonged operation at elevated temperatures will severely reduce the lifespan of the drive's power components.

The control module's internal temperature has exceeded its predefined safe operating limit. This suggests the control electronics are overheating, which can lead to unstable operation, data corruption, or damage to the module. Causes typically relate to environmental conditions or airflow issues specific to the control section.

This fault indicates that the drive's hardware has detected an excessive current condition, typically during motor acceleration or deceleration, which can cause significant damage to the drive or motor if not resolved. This often occurs when attempting motor alignment or under heavy mechanical loads. Continuous overcurrent can lead to overheating and premature component failure within the drive.

A hardware-level overcurrent condition has been detected, indicating an immediate excessive current draw. This could stem from incorrect programming, a severe motor overload, improper DC boost settings, or excessively high DC brake voltage.

This fault signifies an unintended current path from the motor or drive output system to ground. It typically occurs during motor acceleration or deceleration and can pose a significant safety risk, lead to equipment damage, or cause electrical interference if not promptly addressed. This indicates a breakdown in insulation.

A ground fault has been detected, indicating an unintended current path from the motor phases or external wiring to ground. This protection prevents electrical shock and damage to the drive or motor.

The output torque current has fallen below a programmed minimum level (A490 [Load Loss Level]) for a duration longer than the set time (A491 [Load Loss Time]). This indicates that the mechanical load on the motor has been lost or significantly reduced, possibly due to a broken belt, coupling failure, or pump cavitation.

One or more of the output phases (U, V, W) to the motor has been lost or is significantly unbalanced, if this function is enabled (A557 [Out Phas Loss En]). This condition can lead to severe motor overheating, vibration, and damage if the motor continues to operate on reduced phases.

An analog input, configured to fault upon signal loss, has detected the absence of its expected signal. This means the analog voltage or current signal from a sensor, potentiometer, or external controller is no longer present. This fault ensures the drive doesn't operate with an invalid or missing command signal.

This fault occurs when an analog input, configured to fault upon signal loss, loses its expected input signal. This means the drive is no longer receiving a valid reference from the analog source (e.g., 0-10V or 4-20mA). This is an Auto-Reset/Run type fault configurable with parameters A092 and A093.

The drive has exhausted its programmed number of automatic restart attempts (A541 [Auto Rstrt Tries]) after an initial fault, but the underlying fault condition persists. This indicates a recurring problem that the drive cannot self-clear, requiring manual intervention to diagnose and resolve the root cause.

This fault indicates that the drive has reached the maximum configured number of automatic restart attempts (set by parameter A092 [AutoRstrt Tries]) after a preceding fault. This signifies a persistent underlying fault condition that requires manual intervention.

A ground fault has been detected specifically on the U-phase output between the drive and the motor. This points to insulation failure in the U-phase motor winding or its connecting cable, creating an unwanted current path to earth ground. This is a severe electrical safety hazard and can cause significant equipment damage.

An electrical short circuit has been detected between the drive's output phase U and ground. This could be due to insulation breakdown in the motor winding or the cable connecting the drive to the motor, posing a risk of electrical shock and further equipment damage if not resolved.

A ground fault has been detected specifically on the V-phase output between the drive and the motor. This points to insulation failure in the V-phase motor winding or its connecting cable, creating an unwanted current path to earth ground. This is a severe electrical safety hazard and can cause significant equipment damage.

A grounded phase condition has been detected specifically on motor phase V or in the wiring connecting drive output terminal V to the motor. This indicates a direct short path to ground.

A ground fault has been detected specifically on the W-phase output between the drive and the motor. This points to insulation failure in the W-phase motor winding or its connecting cable, creating an unwanted current path to earth ground. This is a severe electrical safety hazard and can cause significant equipment damage.

An electrical short circuit has been detected between the drive's output phase W and ground. This could be due to insulation breakdown in the motor winding or the cable connecting the drive to the motor, posing a risk of electrical shock and further equipment damage if not resolved.

Excessive current has been detected between the drive's U and V output terminals, indicating a short circuit. This could be a phase-to-phase short in the motor windings or within the cables connecting the drive to the motor. This is a critical fault that can cause severe damage to the drive's output power stage (IGBTs) if not immediately addressed.

An excessive current flow, indicative of a short circuit, has been detected between the drive's output terminals U and V. This typically signifies a phase-to-phase short in the motor windings or the cabling, which can cause severe damage to the motor or drive's output stage if not immediately addressed.

Excessive current has been detected between the drive's U and W output terminals, indicating a short circuit. This could be a phase-to-phase short in the motor windings or within the cables connecting the drive to the motor. This is a critical fault that can cause severe damage to the drive's output power stage (IGBTs) if not immediately addressed.

This fault detects a short circuit condition between motor phases U and W at the drive output. This implies an insulation failure within the motor windings or a direct short in the cabling connecting the drive to the motor.

Excessive current has been detected between the drive's V and W output terminals, indicating a short circuit. This could be a phase-to-phase short in the motor windings or within the cables connecting the drive to the motor. This is a critical fault that can cause severe damage to the drive's output power stage (IGBTs) if not immediately addressed.

An excessive current flow, indicative of a short circuit, has been detected between the drive's output terminals V and W. This typically signifies a phase-to-phase short in the motor windings or the cabling, which can cause severe damage to the motor or drive's output stage if not immediately addressed.

The drive has received a command to write its factory default values to the EEPROM (non-volatile memory), overwriting any custom configuration settings. This fault often occurs after a parameter reset operation, meaning the drive will now operate with its base settings and requires reprogramming for specific applications.

This fault indicates that the drive has been commanded to restore its parameters to factory default values, typically through a user action or system command. While not a malfunction, it means previous custom configurations are lost, which could lead to incorrect operation if not re-programmed.

Both of the drive's safety inputs (Safety 1 and Safety 2) are not enabled, indicating an open condition in the external safety circuit. This fault signals that the drive's integrated safety function detects an unsafe state, preventing motor operation until the safety inputs are properly closed and secure.

A software-defined shear pin level (programmed in A486, A488 [Shear Pinx Level]) has been exceeded for a duration longer than the set time (A487, A489 [Shear Pin x Time]). This indicates a sustained excessive mechanical load, triggering a protective trip designed to prevent damage to the driven equipment, not necessarily the motor or drive.

A software-detected overcurrent condition has occurred, meaning the instantaneous output current has exceeded the trip level configured by parameter A098 [SWCurrent Trip]. This is a configurable threshold for current monitoring.

This fault indicates that the drive's internal thermal model has detected a prolonged current draw exceeding its rated capacity, typically occurring under high load conditions. Continuous operation in an overload state will reduce the lifespan of the drive, generate excessive heat, and potentially damage internal components. This often signals that the drive is undersized for the application or there's an issue with the mechanical system.

This fault indicates that the drive itself is operating beyond its continuous current rating, typically due to an excessive motor load or an acceleration time that is too short.

A critical failure has been detected within the drive's power section (e.g., rectifier, DC bus, inverter IGBTs). This indicates a significant internal hardware component failure that severely impacts the drive's ability to convert and deliver power to the motor. This usually requires component replacement or drive replacement.

An internal hardware failure has been detected within the drive's power conversion section, which is responsible for supplying power to the motor. This is a critical internal fault, often indicating damage to IGBTs or other power components, and requires immediate attention to prevent further system damage or safety hazards.

Control over the Modbus or DSI communication link has been interrupted, meaning the drive has lost communication with its master controller via the DSI port. This prevents remote commands and monitoring, potentially causing the drive to fault or transition to a safe state based on its parameter settings.

This fault occurs when communication is lost with the drive over the configured network. This could be due to physical disconnection, network configuration issues, or a problem with the communication adapter.

Control over the installed network option card's remote network has been interrupted. This means the drive has lost communication via its optional network adapter (e.g., EtherNet/IP, DeviceNet, Profibus), leading to a loss of remote control and monitoring capabilities. The drive's response (e.g., fault, stop, coast) depends on its communication loss settings.

Control through the drive's embedded EtherNet/IP adapter has been interrupted. This signifies a loss of communication between the drive and its EtherNet/IP master controller or PLC, resulting in the loss of remote command and control capabilities and potentially triggering a fault or shutdown.

The autotune function, which optimizes motor control parameters, was either manually canceled or failed to complete successfully. This means the drive may not be properly tuned to the connected motor, potentially leading to suboptimal performance, instability, or inefficient operation.

This fault signifies that the autotune function for Sensorless Vector Control (SVC) was either intentionally cancelled by the user or failed to complete successfully. This might prevent optimal motor control.

Communications between the drive and the Modbus or DSI master device have been interrupted. This is a specific loss of data exchange over the serial DSI link, preventing the drive from receiving commands or sending status, which can cause it to fault or stop. The drive's response is governed by parameter C125 [Comm Loss Action].

Communication over the drive's RS-485 (DSI) port has ceased, meaning the drive is no longer able to send or receive data from connected serial devices. This can lead to loss of control or monitoring via the serial interface.

Communications between the drive and its installed network option card have been interrupted. This indicates a problem with the internal data exchange between the main drive controller and the optional network interface card itself, affecting remote connectivity and control. The drive's response to this loss is defined by parameter C125 [Comm Loss Action].

Internal communications between the drive's main controller and its embedded EtherNet/IP adapter have been interrupted. This is a fault internal to the drive's architecture, distinct from external network issues, signifying a failure in the communication path that prevents the drive from interacting with the Ethernet network. The drive's response is governed by parameter C125 [Comm Loss Action].

One of the two required encoder channel signals (e.g., Channel A or B for differential encoders) is missing. This deprives the drive of accurate feedback on motor speed or position, leading to unstable control, position errors, or complete shutdown in applications requiring precise motion control.

The "Freeze-Fire" (Function Loss) input is inactive or open, typically configured on a digital input terminal. This input is designed to be active during normal operation, and its loss indicates a pre-programmed operational or safety condition that requires the drive to stop.

The non-volatile memory storing the drive's parameters has detected a checksum error, indicating data corruption. This means the drive's saved configuration settings are invalid or unreadable, potentially preventing proper startup or operation. A factory reset is typically required to restore integrity.

The external non-volatile storage, often used for backing up or expanding parameter storage, has failed. This fault indicates a problem with the memory component where drive settings are permanently saved, potentially leading to lost configurations or inability to save changes.

The control module was detected to be disconnected from the power module while power was still applied to the drive. This "hot-swapping" action can lead to parameter corruption, damage to the control module, or damage to the power module due to sudden power cycling of sensitive electronics.

The PowerFlex 525 control module has been paired with a power module that has an incompatible 0.25 HP power rating, which it does not support. This is a fundamental hardware mismatch between the control and power sections, preventing proper operation.

The control module is unable to recognize the power module it is attached to, indicating a hardware failure or improper assembly after a module change. The drive cannot establish basic communication or identification with its power section, preventing startup.

The control module has been mounted to a power module of a different drive type or series than it is designed for. This mismatch in hardware architecture prevents proper initialization and operation, as the control module's firmware cannot correctly interface with the power section.

A failure has occurred in the keypad membrane or its connection to the control module. This means the drive's local human-machine interface (HMI) is malfunctioning, preventing manual operation, parameter changes, or fault clearing from the keypad.

A malfunction in the safety input enable hardware has been detected, specifically that one of the required safety inputs (S1 or S2) is not enabled. This indicates a problem within the drive's integrated safety circuit or incorrect external safety wiring, preventing safe operation.

A critical microprocessor failure has occurred within the drive's control module. This indicates a severe internal hardware or firmware issue with the central processing unit, which can lead to unpredictable behavior, persistent faults, or complete operational failure.

A critical hardware failure has been detected within the drive's control board and/or its integrated input/output (I/O) section. This means the drive cannot reliably process control signals or manage its I/O, rendering it inoperable and potentially affecting interconnected control systems.

The firmware residing in the drive's flash memory is corrupt, mismatched, or incompatible with the current hardware configuration. This prevents the drive from initializing or operating correctly, indicating that the drive's operating system needs to be reinstalled or updated.

A non-recoverable firmware or hardware error has been detected, causing the drive to automatically stop and reset. This is a severe internal issue that the drive cannot self-correct, indicating persistent damage to the hardware or a critical, unrecoverable software fault.

A critical firmware problem has been detected, forcing the drive to operate using backup firmware which only supports DSI communications. This is a degraded operating mode with limited functionality. A full firmware flash update via DSI is necessary to restore complete drive features and stable operation.