Complete List of Yaskawa Fault Codes & Manuals | ErrorLib

bAT

Keypad Battery Low Voltage

The internal battery providing backup power to the keypad has dropped to a low voltage level. This condition compromises the keypad's ability to retain parameter settings or maintain its display, potentially leading to loss of drive configuration or operational instability from the keypad if not addressed promptly.

bCE

Bluetooth Communication Fault

This fault indicates a failure in establishing or maintaining Bluetooth communication between the drive's keypad and a paired smartphone or tablet running DriveWizard Mobile. It commonly arises from the mobile device being too far from the keypad or from radio frequency interference from other 2.4 GHz devices. Unresolved, this prevents remote monitoring, parameter adjustments, and diagnostic functions, impacting operational efficiency.

boL

Braking Transistor Overload Fault

The braking transistor, an internal component responsible for dissipating regenerative energy, is experiencing an overload condition. This occurs when the drive's deceleration duty cycle or regenerative power is too high, or if the transistor itself is faulty. Persistent overload can lead to overheating and irreversible damage to the transistor, impairing the drive's ability to manage braking energy safely and effectively.

bUS

Option Communication Error

This fault signals a critical communication failure involving an installed option card, indicating a disruption in data exchange with either the drive or an external controller. Causes range from incorrect or damaged wiring and short circuits to significant electrical interference or improper option card installation. Such a communication breakdown prevents the drive from receiving essential commands or feedback, potentially leading to unexpected stops or complete loss of control.

CE

Communication Data Error

This fault indicates that the drive has experienced a communication data error, typically due to electrical interference on the control circuit lines. The drive detects this error if it fails to receive correct control data within the timeout period defined by parameter H5-09. If left unaddressed, this can lead to unreliable control of the motor, unexpected stops, or incorrect operation, potentially disrupting the process.

CF

Control Fault

This fault can stem from various issues including incorrect motor parameter settings, an excessively low torque limit, or an over-sized load inertia relative to the drive's deceleration capability. It also occurs if wiring errors exist between the motor and drive, if Line-to-line Resistance Tuning has not been performed, or if a Run command is issued while the motor is still coasting. Unresolved control faults can lead to poor motor performance, unexpected stops, or damage to the motor/drive due to improper control.

CoF

Current Offset Fault

A Current Offset Fault occurs when the drive attempts to start operation while residual induced voltage is still present in the motor, such as after coasting to a stop or rapid deceleration. This indicates the current offset value has exceeded its permitted automatic adjustment range. In rare cases, this fault may also point to an internal hardware problem within the drive itself. Failure to resolve this can lead to incorrect motor control, erratic startup behavior, or potential damage if a hardware issue is present.

CP1

Comparator 1 Limit Error

This fault indicates that the value being monitored by Comparator 1 (as selected by H2-20) has fallen within the predefined limits set by H2-21 (Lower Limit) and H2-22 (Upper Limit). This typically signifies an unexpected condition within the monitored parameter that has triggered the comparator's protection function. Depending on the monitored parameter, this could indicate an underspeed, overcurrent, or other critical process deviation, requiring immediate attention to prevent system damage or operational failure.

CP2

Comparator 2 Limit Error

This fault signifies that the value monitored by Comparator 2 (selected by H2-26) has deviated *outside* the acceptable range defined by H2-27 (Lower Limit) and H2-28 (Upper Limit). This condition indicates that the monitored parameter has either gone too high or too low, triggering a protection response. Depending on the specific parameter being monitored, this could point to an over-temperature, under-pressure, or other critical process excursion that risks equipment damage or process instability if not resolved.

CPF00