Yaskawa Error Code A910 | 720p 2026 |
| Cause | Description | |-------|-------------| | Motor cable break | Open circuit in U, V, or W phase cable | | Motor winding failure | Open or severely imbalanced motor winding | | Contactor/MCCB issue | Output contactor opened or faulty | | Phase loss due to loose terminal | Loose connection at drive output or motor terminals | | Current sensor failure | Rare, but possible internal drive hardware issue |
DIY troubleshooting is effective for external power issues. However, seek professional help if:
Have this information ready when calling:
A: Unlikely. As noted in Step 3, if the error persists with the motor disconnected, the motor is not the cause. However, a faulty motor (phase-to-phase short) can sometimes trigger the fault. Test with motor disconnected first.
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.
Do not confuse A910 with these similar codes:
| Error Code | Name | Key Difference | | :--- | :--- | :--- | | A900 | Main Circuit Overvoltage | DC bus voltage too high (often decel issues) | | A915 | Control Power Undervoltage | Internal 24V/12V logic supply failure | | A910 | Main Circuit Undervoltage | DC bus too low | | UV1 (fault) | Main Circuit Undervoltage (V1000) | Same as A910 but shown as fault, not alarm | | UV3 (fault) | Soft-Charge Circuit Fault | Specific failure of the inrush relay |
If you see A910 repeatedly during deceleration, you actually might have an overvoltage (A900) problem that is causing the DC bus to oscillate and undershoot.
Many Yaskawa drives have a hidden or semi-hidden routine to auto-calibrate the current sensors. This is often the only fix without hardware repair.
For GA800 and GA700:
For A1000 and V1000:
Need the full list of Yaskawa error codes?
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
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. yaskawa error code a910
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.
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
In Yaskawa systems, the code typically indicates an Overload Warning | Cause | Description | |-------|-------------| | Motor
. Depending on whether you are using a Servo Drive or a Robot Controller, the specific implications and fixes vary. 1. Yaskawa Servo Drives (Sigma Series) For Yaskawa servo drives (like Sigma-5 or Sigma-7),
is a warning that the motor is operating near its thermal limit. It is a "pre-alarm" that occurs before the drive trips on a hard overload fault (like A.710 or A.720).
The servomotor has been operating at a torque level exceeding its rating for a sustained period. Common Causes: High Load:
The motor is pushing or pulling more weight than it is rated for. High Ambient Temp: The surrounding environment is hotter than 40°C ( Mechanical Bind:
There is friction or a jam in the mechanical system the motor is driving. Wiring/Encoder Issues:
A faulty encoder or internal circuit can sometimes trigger false thermal readings. Recommended Actions: Reduce Load: Decrease the cycle rate or the weight the motor is moving. Check Mechanics:
Ensure there are no physical obstructions or worn-out bearings causing extra friction.
Ensure the drive's cooling fan is working and the cabinet has proper ventilation. MachMotion 2. Yaskawa Motoman Robots (DX100, FS100) On robot controllers, the code is often categorized as a related to specific communication or internal board issues. Yaskawa Knowledge Center DX100 / FS100 Controllers: Typically indicates a CPU Error (YCP01 or CPU-201R) Common Causes: Faulty internal control board. Loose connection between the CPU board and the backplane. Corrupted system software or CMOS data. Recommended Actions: Power Cycle:
Turn the controller off, wait 30 seconds, and turn it back on. Reseat Boards: With power off, carefully reseat the CPU board in its slot. Technical Support:
If the error persists, the CPU board may need repair or replacement through the Yaskawa Motoman Support Center Yaskawa Knowledge Center Have this information ready when calling:
For further assistance, you can find official documentation and manuals on the Yaskawa Technical Document Library Are you seeing this code on a servo drive display robot teach pendant Yaskawa Servo Drive Alarm Codes Guide | PDF - Scribd
Yaskawa Error Code A910: Overload Warning