Yaskawa Error Code — A910 ((better))

In Yaskawa systems, specifically the Sigma-7 Series Servo Drives, the error code A.910 (often displayed as A910) indicates an Overload Warning. This is a minor fault or alarm notifying the operator that the drive is operating near its thermal limit, but has not yet reached the critical trip point. Meaning and Impact

Description: The drive has detected that the motor or SERVOPACK is approaching an overload condition based on its internal protection characteristics.

Behavior: Unlike a hard "Fault," an alarm like A.910 may not immediately stop the motor but serves as a warning that a shutdown is imminent if the load is not reduced. Common Causes

The A.910 alarm is typically triggered by one of the following factors:

Incorrect Wiring: Faulty contacts or incorrect wiring between the servomotor and encoder.

Excessive Load: Mechanical problems (e.g., binding, friction) or operating conditions that exceed the motor's capacity.

Parameter Settings: The overload warning level defined in parameter Pn52B is set too low for the current application. yaskawa error code a910

Hardware Failure: A internal failure within the SERVOPACK itself. Recommended Remedies

To resolve the A.910 alarm, Yaskawa documentation recommends these steps:

Inspect Wiring: Ensure the servomotor and encoder are correctly and securely wired.

Evaluate Load: Check for mechanical blockages or reconsider the operating conditions. If the load is consistently too high, you may need a motor with a higher capacity.

Adjust Parameters: Verify and set a suitable overload warning level in parameter Pn52B.

Hardware Check: If the alarm persists despite proper wiring and load conditions, the SERVOPACK may be faulty and require replacement. In Yaskawa systems, specifically the Sigma-7 Series Servo

For more technical details, you can refer to the official Yaskawa Sigma-7 Manual or troubleshooting resources like Click2Electro. 6.3 Drive Alarms, Faults, and Errors

Here is the detailed content regarding the Yaskawa Error Code A910.

This error appears primarily on Yaskawa V1000, J1000, U1000, and GA800 series drives.

Step 5: Bypass the Drive (if possible)

When to Call Yaskawa Support

Troubleshooting Steps

  1. Monitor the Current:

    • Check the drive's monitor display (typically U-01 or U-02) during operation. If the current is exceeding the rated current of the motor (found on the motor nameplate) or the rated current of the drive, the warning is valid.

  2. Check Parameter Settings:

    • Verify E2-01 (Motor Rated Current) matches the nameplate on the motor exactly.
    • Check L3-02 (Stall Prevention Level during Run). If set to the default (usually 150-160%), try increasing it slightly only if the motor and cabling can handle the extra current.

  3. Inspect the Mechanical Load:

    • Disconnect the motor from the load (if possible) and run the motor alone. If the warning disappears, the issue is the mechanical machine (jams, bad bearings, gearbox issues), not the electrical system.

  4. Adjust Acceleration Times:

    • Increase the acceleration time (parameter C1-01) to allow the motor to ramp up speed more gently, reducing inrush current.

Description

Error code A910 is a warning (not a critical fault that stops operation immediately) indicating that the inverter has detected an output current exceeding the rated value.

Specifically, it means the inverter’s internal thermal overload protection logic has calculated that the motor or the inverter itself is being stressed. If the current level remains high, it will eventually trigger a critical fault (usually A911 or A920) and shut down the drive to prevent damage.

Step 6: Monitor with DriveWorks or SigmaSoft+

For advanced users, connect to the drive via software. You can view U1-07 (DC Bus Voltage) as a trend. A ripple pattern on the DC bus suggests bad capacitors. A sudden drop during acceleration suggests wiring or soft-charge issues.

When to Call Yaskawa or a Service Center

DIY troubleshooting is effective for external power issues. However, seek professional help if:

  1. You measure shorted or open rectifier diodes at the input terminals.
  2. The DC bus voltage measures less than 50V when AC input is present and properly fused.
  3. Bulging or leaking electrolytic capacitors are visible on the main PCB.
  4. The drive emits a loud clicking noise (bypass relay failing) just before A910 appears.
  5. You have replaced input fuses multiple times without finding the external cause.

Have this information ready when calling: Step 5: Bypass the Drive (if possible)