Allen-Bradley PowerFlex 700 AC Drives

The checksum read from the board's memory does not match the calculated checksum. This indicates data corruption in the drive's parameter memory, which can lead to incorrect drive operation.

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.

The calculated checksum of User Set 2 parameter data does not match the stored checksum. This indicates that the saved user parameters for User Set 2 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.

The calculated checksum of User Set 3 parameter data does not match the stored checksum. This indicates that the saved user parameters for User Set 3 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.

The checksum read from the EEPROM on the power board does not match the checksum calculated from the EEPROM data. This indicates data corruption in the power board's non-volatile memory.

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 was replaced, and parameters were not programmed. This is a reminder that the drive requires parameter configuration after a board replacement to ensure proper 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.

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.

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 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.

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.

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 drive has unsuccessfully attempted to reset an active fault and resume running for the programmed number of [Flt RstRun Tries]. This indicates a persistent underlying fault condition that the drive cannot clear automatically. The behavior of this function can be enabled or disabled via [Fault Config 1] on page 1-46.

The drive output current has exceeded its 1ms current rating, which is typically 200-250% of the drive's continuous rating. This indicates a sudden, high current demand that could be due to excessive load, improper DC boost settings, or excessively high DC brake volts, risking damage to the drive.

A phase-to-ground fault has been detected between the drive and motor on output phase U. This indicates a severe insulation breakdown or short circuit between phase U 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 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.

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.

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. 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 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.

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.

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.

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 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 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.

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.

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.