Code A910 Exclusive — Yaskawa Error

  • Attempt a controlled release

  • Use the Yaskawa engineering tool

  • Check network and bus settings

  • Inspect safety/interlock devices

  • Resolve lingering logical locks

  • Firmware and parameter checks

  • Log and monitor

    • Some Yaskawa drives allow a "communication bus reset" via parameters. Enter Programming Mode: yaskawa error code a910 exclusive

    The drive has calculated that the motor current has exceeded the safe limit for a specific amount of time. The electronic thermal overload protection function has triggered a warning.

    This is distinct from code A920 (Overload Trip), which actually stops the drive. A910 is a predictive warning telling you that a trip is imminent if the load does not decrease.

    In very rare cases, if the cause is a momentary input power dip, the alarm may self-clear after a few power cycles. However, Yaskawa’s technical manuals explicitly state that A910 is a “fault” not an “alarm” – meaning the drive will not attempt to run. For 95% of field cases, the drive requires repair or replacement.

    Once the physical cause is resolved or parameters are corrected:

    Summary Checklist:

    The Yaskawa error code A910 (often displayed as A.910) indicates a "Momentary Power Loss" or "Undervoltage during Run" fault on Yaskawa AC drives (e.g., A1000, V1000, J1000, GA500, GA800 series).

    Yaskawa Error Code A910 is “exclusive” because it points directly to a hardware failure in the drive’s charging path. While software errors can often be tuned out, A910 demands a hardware-level response. If you see this code, plan for drive replacement or send the unit to a Yaskawa-authorized service center. Do not attempt to bypass the pre-charge circuit – doing so can cause explosive capacitor failure. Attempt a controlled release

    Need immediate help? Contact Yaskawa Dr Support with the drive model number and a DC bus voltage reading.

    In Yaskawa systems, the A.910 error code generally indicates an Overload Warning (pre-alarm) for servo drives or a CPU Error for specific robot controllers. For Yaskawa Sigma-3, Sigma-5, and Sigma-7 Servo Drives

    The A.910 code acts as a warning that the drive is approaching an overload state (specifically alarms A.710 or A.720).

    Cause: The motor is operating under a torque that significantly exceeds its ratings for several seconds to minutes. Common Factors:

    Wiring: Faulty or incorrect contacts in the servomotor or encoder wiring.

    Mechanical Load: The starting torque exceeds the motor's maximum capacity, or there is high friction/interference in the mechanical system.

    Environment: The temperature inside the SERVOPACK panel is too high (exceeding 55°C). Remedies: Use the Yaskawa engineering tool

    Check Wiring: Verify all motor and encoder connections are secure and correct.

    Reduce Load: Reconsider the operating conditions or increase the motor capacity if it is undersized for the application.

    Adjust Parameters: Check parameter Pn52B to ensure the overload warning level is set correctly for your specific process.

    Cooling: Ensure the panel cooling is functioning and that the ambient temperature is within limits. For Motoman FS100 Robot Controllers

    On the FS100 controller, alarm 0910 is classified as a CPU Error related to the CPU-201R board.

    Cause: This usually indicates an internal hardware failure or a malfunction in the control circuit's self-diagnosis function, often caused by excessive electrical noise.

    Remedy: Power cycle the controller. If the error persists, the CPU board may need replacement by a Yaskawa representative. Table 1 - Yaskawa