Allen-Bradley PowerFlex 4

This fault indicates that an external auxiliary input, often configured as a safety interlock or enable signal, is currently open or inactive when the drive expects it to be closed. This condition prevents the drive from operating and is typically a protective measure. An unresolved open interlock will stop the drive, potentially indicating a safety bypass or an issue with an external control device.

This fault signals that the DC bus voltage within the drive is experiencing excessive ripple, which usually indicates an unstable or insufficient incoming AC power supply. This can be caused by a complete or partial loss of one or more phases, or a significant imbalance in the supply voltage. Operating with excessive DC bus ripple can stress internal components and lead to erratic drive behavior or component failure if not addressed.

The drive has detected that the DC bus voltage has dropped below its predefined minimum operating threshold. This condition typically occurs due to low incoming AC line voltage, a momentary power interruption, or excessive voltage sag from the utility supply. Sustained undervoltage can prevent the drive from operating correctly, cause nuisance trips, or indicate a problem with the main power supply, potentially halting equipment operation.

This fault signals that the AC line voltage or the DC bus voltage has exceeded its maximum permissible level. High line voltage, transient conditions, or motor regeneration (motor acting as a generator during deceleration) are common causes. Overvoltage can damage drive components.

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.

This fault indicates that the motor connected to the drive has experienced an internal electronic overload trip, meaning it has drawn excessive current for an extended period. This is often caused by an excessive mechanical load on the motor, leading to overheating and potential damage to the motor windings. The drive’s internal electronic overload protection attempts to prevent motor damage. Continuous overloading will shorten the motor’s lifespan and can lead to winding burnout.

This fault indicates that the drive's heatsink temperature has exceeded its safe operating limit. Common causes include obstructions to airflow, accumulated dirt on the fins, or an ambient temperature that is too high.

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 indicates that the drive has detected a leakage current path from one or more of its output terminals to earth ground. This typically points to a compromised insulation in the motor windings or the motor wiring, creating an unintended electrical path to ground. A ground fault is a serious safety concern, posing a risk of electric shock and potential damage to the motor or drive if not promptly addressed.

This fault indicates that the drive has detected a loss or out-of-range condition on the analog input signal used for speed reference. The fault is generated when parameter A122 (Analog In Loss) is explicitly configured to trigger a fault on loss of signal. This can be caused by disconnected wiring, a faulty analog sensor/source, or an incorrect analog signal level at the drive input terminals.

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.

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.

An electrical short circuit has been detected between the drive's output phase V 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.

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.

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.

An excessive current flow, indicative of a short circuit, has been detected between the drive's output terminals U 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.

A short circuit condition has been detected between motor phases V and W, or in the wiring connecting drive output terminals V and W to the motor. This indicates an unintended low-resistance path between these phases.

This fault indicates that the drive has either been commanded to restore factory default values to its EEPROM, or a corruption of parameter data occurred spontaneously. This resets all configurable parameters.

The software current trip limit, set in parameter A448 [SW Current Trip], has been exceeded. This indicates that the motor or load is drawing more current than the configured software limit, which can be a sign of mechanical overload or an improperly set current trip value. Persistent overcurrent can damage the motor or connected equipment.

The drive's internal overload protection has tripped, indicating that its output current has exceeded 150% of its rated capacity for 1 minute, or 200% for 3 seconds. This signifies that the drive is being asked to supply more power than it can safely deliver, risking damage to the drive's power components.

A fault has been detected within the drive's internal power unit hardware. This indicates a potential malfunction of power components such as the rectifier, DC bus capacitors, or inverter IGBTs.

The drive has lost communication with its external network adapter or the network itself has failed. This means the drive is no longer receiving commands or transmitting status via the network, preventing remote control and monitoring.

Communication has been lost with an adapter or the connected network. This can be due to intentional disconnection, issues with wiring, or failure of a port expander or adapter. The drive's response to this loss is configured by parameter A105 [CommLoss Action].

An inconsistency has been detected in the drive's parameter memory; the calculated checksum of stored parameters does not match the expected value. This suggests potential data corruption in the non-volatile memory (EEPROM), which could lead to erratic drive behavior due to incorrect parameter settings.

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.