Yaskawa Error Code A910 Exclusive -
Some Yaskawa drives allow a "communication bus reset" via parameters. Enter Programming Mode:
This is the most common cause. Baseblock is a state where the drive disables its output transistors, essentially disconnecting the motor from power.
Unlike a standard "CALL" or "BUS" error, A910 implies the drive sees the operator physically connected, but the data frame from the operator is corrupt or the timing is off by microseconds. It is an exclusive club of faults that straddle the line between "loose wire" and "imminent board failure."
Do not swap the drive. Swap the digital operator with a brand new or known working unit from another machine of the exact same model.
A910 Exclusive = resource/session ownership prevents access; find and release the owning session (or safely power-cycle) after ensuring the machine is secure.
If you want, I can tailor this article for a specific Yaskawa product family (VFD, Sigma-7 servo, MPiec, or Motoman robot) or format it for a maintenance procedure document.
Yaskawa error code A910 is not a death sentence for your drive. However, treating it like a simple loose connection will lead to repeated downtime and unnecessary replacements. The exclusive insights in this guide—from capacitor ripple testing to FFC wiggling and ghost firmware bugs—equip you to diagnose with surgeon-like precision.
Remember the golden rule of A910: The operator is usually a victim, not the culprit. The drive’s control board, power supply, or interconnects are the true sources 80% of the time.
By applying this long-form, exclusive troubleshooting methodology, you will reduce mean-time-to-repair (MTTR) from hours to minutes and extend the service life of your Yaskawa automation assets.
Next Steps:
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Yaskawa A.910 error code is an "Overload Warning" commonly encountered in Yaskawa Sigma-series servo drives, such as the Sigma-3, Sigma-5, and Sigma-7.
While it doesn't always immediately stop the motor, it serves as a critical pre-emptive alert that the system is approaching a full overload alarm, which will halt production. Understanding the "Exclusive" Nature of A.910 The A.910 code is unique because it is a warning (Gr.2) rather than a hard fault (Gr.1)
. This means it often appears when the drive's internal thermal monitoring predicts an upcoming failure based on current load trends. Common Causes and Remedies Description Recommended Action Wiring Faults
Incorrect or loose contact in the servomotor or encoder wiring. Inspect and secure all motor and encoder connections. High Load Conditions
The starting or operating torque exceeds the motor's rated capacity. Reconsider load weight or increase motor capacity. Mechanical Issues yaskawa error code a910 exclusive
Excessive friction or mechanical jams in the driven equipment.
Check for physical obstructions or lubrication issues in the machinery. Environmental Heat
The temperature inside the SERVOPACK panel has exceeded safety limits. Ensure the panel temperature stays below Parameter Mismatch The overload warning level ( ) is set too low for the application. Adjust parameter to a suitable level for your specific duty cycle. Pro-Tip: The "Quick Fix" Experienced technicians often find that 90% of connectivity-related issues
in Yaskawa drives can be resolved by powering down, unplugging the 1CN and 2CN connectors , blowing them out with compressed air, and reseating them. For deeper diagnosis, connecting a laptop with Yaskawa SigmaWin+
can provide a detailed real-time trace of the torque and current levels causing the warning. Σ-7C SERVOPACK - Troubleshooting Manual - Yaskawa Europe
In Yaskawa Sigma-series servo drives (including Sigma-3, 5, and 7), the A.910 error code indicates an Overload Warning.
This is a "minor fault" or pre-alarm meant to alert you that the motor is approaching its thermal limit. If left unaddressed, the drive will eventually escalate to a hard fault like A.710 (Instantaneous Overload) or A.720 (Continuous Overload) and shut down. Common Causes
Mechanical Binding: Physical obstruction or excessive friction in the machine's moving parts.
Operating Beyond Capacity: The load or duty cycle exceeds the motor's rated torque.
Incorrect Wiring: Faulty contact or miswired power/encoder cables.
Parameter Settings: The overload warning level (Pn52B) is set too low for the current application.
High Ambient Temp: Excess heat inside the SERVOPACK panel (typically should be below 55°C). Recommended Solutions
Inspect Mechanics: Check for any physical jams or lubrication issues causing extra drag.
Verify Wiring: Ensure the motor and encoder cables are securely connected and not damaged.
Check Parameters: Review the Pn52B parameter to ensure the warning threshold is appropriate for your operation. Some Yaskawa drives allow a "communication bus reset"
Cooling: Check if panel fans are working or if the heat sink is obstructed.
Re-evaluate Sizing: If the error persists under normal operation, you may need a motor with higher torque capacity.
For detailed technical specs, you can refer to the official Yaskawa Sigma-7 Troubleshooting Guide or explore the Sigma-5 Alarm Table for related codes. Yaskawa Servo Drive Alarm Codes Guide | PDF - Scribd
Yaskawa Error Code A.910 Overload Warning typically found on Yaskawa Sigma-7 (and occasionally Sigma-5) servo drives. Unlike hard faults that immediately shut down the system, this code acts as an early warning alert. It notifies operators that the motor has been operating continuously at a torque level exceeding its rating, putting it on the verge of a critical overload trip (such as an A.710 or A.720 overload alarm).
Resolving this code promptly is essential to avoid forced machine downtime. This feature guide breaks down the causes, diagnostic steps, and remedies for the A.910 error. 🔍 Quick Reference: A.910 Overview Alarm Name Overload Warning Yaskawa Sigma-5 / Sigma-7 Series SERVOPACKs Primary Meaning
The motor is operating dangerously close to its thermal or torque limits. System Behavior
The drive will generally continue running but issues a warning. If unaddressed, it will escalate to a full shutdown alarm. ⚠️ Top 5 Causes of Error A.910
The A.910 warning is triggered by one of these common system stresses: Mechanical Binding or Jamming:
Debris, lack of lubrication, or worn-out bearings create physical resistance, forcing the motor to draw more torque than necessary. Exceeded Operation Profiles:
High-cycle rates, overly aggressive acceleration/deceleration curves, or continuous peak-torque demands that exceed the motor's rated capacity. Incorrect Parameter Thresholds: The overload warning level parameter (
) is set too low or inappropriately for the specific application. Wiring or Contact Faults:
Poor physical connections or damaged encoder/power cables providing inconsistent feedback or power drops. Hardware Failure: Internal damage within the SERVOPACK itself. 🛠️ Step-by-Step Diagnostic & Remedy Feature
When an A.910 code appears on your digital operator, follow this sequential troubleshooting pipeline: 1. Inspect the Mechanical System
Check the machinery driven by the servomotor for physical obstructions, misalignments, or excessive friction.
Clear any jams, realign mechanical actuators, and lubricate guide rails or gearboxes to minimize drag. 2. Evaluate Operating Conditions Yaskawa error code A910 is not a death
Review the motion profile (speed, acceleration, and duty cycle) at the host controller.
If the motor is running at peak torque for too long, reduce the acceleration rates, lengthen the cycle times, or decrease the overall payload. If the load cannot be reduced, consider upgrading to a motor with a higher capacity. 3. Adjust Parameter Pn52B (Overload Warning Level) Check the value of parameter
, which dictates at what percentage of the rated load the A.910 warning triggers.
If the load is safely within the continuous capability of the motor but simply riding high, adjust to a more suitable threshold to prevent nuisance warnings. 4. Verify Wiring and Connections
Inspect the main circuit power cables and the encoder cables linking the motor to the SERVOPACK.
Ensure all terminals are tightly secured and free of corrosion. Look for cracked or frayed shielding on cables that could be inducing electronic noise. 5. Address Potential SERVOPACK Failure
If mechanical loads are verified as normal and parameters are correct but the code persists.
The current detection or internal logic of the drive may be failing. Replace the SERVOPACK unit. 🛡️ Best Practices to Prevent A.910
To stop Overload Warnings from disrupting your facility's operations, implement these preventive habits: Perform Regular Audits:
Routinely monitor the drive's actual torque output using Yaskawa's
software to see how close the baseline operations are to the rated capacity. Scheduled Lubrication:
Keep automated tracks, ball screws, and bearings lubricated to ensure the motor does not overwork to combat dry friction. Enclosure Cooling:
Ensure your control cabinets have active cooling or filtered ventilation; high ambient heat lowers a servo drive's effective capacity. 6.3 Drive Alarms, Faults, and Errors
If you encounter A910, follow this exclusive checklist: