Yaskawa Error Code A910 Access

To effectively troubleshoot, you must identify the specific scenario under which the error appears. Below are the six most common root causes.

Yaskawa Error Code A910 is an undervoltage alarm of the main DC bus. While it can be a protective response to a brief power glitch, it often points to serious infrastructure issues: loose wires, undersized feeders, aging capacitors, or a failing soft-charge circuit.

Always start with the simple things—measure your incoming voltage, tighten all connections, and disable momentary power loss ride-thru as a diagnostic step. Do not repeatedly reset the alarm without investigating; each undervoltage event stresses the drive’s front-end components.

By understanding the root causes and following the structured troubleshooting guide above, you can minimize downtime, avoid unnecessary drive replacements, and ensure your Yaskawa automation system runs reliably for years to come.

Need more help? Yaskawa’s technical documentation for your specific drive series (Technical Manual TM.V1000.01, for example) contains detailed timing charts and waveform examples for A910 detection. Always keep the latest manual available for your exact drive revision.

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 yaskawa error code a910

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.

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. To effectively troubleshoot, you must identify the specific

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.

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 1: Verify the Load

Step 2: Check Motor Wiring

Step 3: Adjust or Disable the Warning

Step 4: Review Parameters (L6 - Torque Detection) | Parameter | Name | Typical Setting | | :--- | :--- | :--- | | L6-01 | Torque Detection Selection | 1 = Low torque detection (alarm only / continues running) | | L6-02 | Torque Detection Level | Set as % of drive rated current. Low torque = lower %. | | L6-03 | Torque Detection Time | 0.1 sec - 10.0 sec. Time torque must stay low to trigger. | | L6-04 | Torque Detection Filter | Filter time constant to prevent false trips. |

Once you’ve resolved the A910 fault, implement these best practices to prevent recurrence:

Electrolytic capacitors have a finite lifespan—typically 5 to 10 years under normal operating temperatures. As capacitors dry out, their Equivalent Series Resistance (ESR) rises. They can no longer "hold" the DC voltage steady, especially under fluctuating loads. You will see A910 occur intermittently, often during load transients.

| Test | Method | |------|--------| | Continuity | Measure resistance between U-V, V-W, W-U at drive terminals. All should be equal (low ohms, usually <2 Ω). | | Ground insulation | Measure resistance from each phase to ground. Should be >1 MΩ (preferably >10 MΩ). | | Check contactor | If an output contactor exists, ensure it closes fully and has clean contacts. |