Yaskawa Error Code A910 Exclusive May 2026

In the context of Yaskawa servo drives (such as the Sigma-7, Sigma-5, and Sigma-3 series), error code A.910 is a warning indicating an Overload condition.

This code is distinct from a hard "alarm" (which would stop the motor); instead, it serves as a preemptive alert that the system is approaching the thresholds for more severe overload alarms, specifically A.710 (Instantaneous Maximum Load) or A.720 (Continuous Maximum Load). Root Causes of A.910

The warning is typically triggered when the drive detects the motor is working harder than its rated capacity. Common reasons include:

Mechanical Resistance: Excessive friction or a jam in the connected machinery that forces the motor to draw more current to maintain speed.

Operating Conditions: High-frequency acceleration/deceleration cycles or a load inertia that exceeds the motor’s design limits.

Parameter Settings: The overload warning level (parameter Pn52B) may be set too low for the specific application.

Wiring Issues: Incorrect or loose contact in the servomotor or encoder wiring can lead to inefficient operation and false load readings.

Environmental Factors: High ambient temperatures (exceeding 40–55°C) within the control panel can reduce the drive's thermal overhead. Troubleshooting & Solutions Yaskawa Servo Drive Alarm Codes Guide | PDF - Scribd

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

Excessive friction or mechanical jams in the driven equipment. yaskawa error code a910 exclusive

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

Based on Yaskawa documentation (specifically for the GA500, GA700, A1000, and V1000 series drives), Error Code A910 indicates an Overload Warning.

Here is the exclusive breakdown of the error, its causes, and the solution steps.

Primary Causes of Yaskawa Error A910

To fix this exclusively, you must understand the root physics behind the error. Here are the four definitive causes:

Why is it “Exclusive”?

Unlike general software or parameter-setting errors (e.g., oC, oH, or bUS errors), A910 is exclusive because:

It is hardware-locked – You cannot clear this error by changing parameters or cycling power if the root cause is physical damage.
It is not user-resettable in most cases – Many Yaskawa alarms can be reset via the HOA keypad or a digital input. A910 often persists until the drive is serviced.
It applies only to specific drive series – For example, in the GA800 series, A910 is exclusive to units with an internal pre-charge relay. Smaller drives without that relay will never see this code.

What is Yaskawa Error Code A910?

First, a crucial distinction: In the Yaskawa ecosystem, error codes beginning with "A" are typically Alarms (faults that stop the drive), while "A9" series codes are often related to Option Card communication or Hardware initialization failures.

Error Code A910 specifically indicates a Digital Operator Connection Fault or a Communication Mismatch between the main control board (MCU) and the connected digital keypad (typically a JVOP-180, JVOP-181, or similar LED/LCD operator).

In exclusive technical terms: The drive’s internal watchdog timer did not receive the expected handshake signal from the digital operator within the specified time window. This is not a parameter setting error (like a motor tuning fault). It is a low-level hardware or firmware handshake failure.

Troubleshooting Step-by-Step

If you encounter A910, follow this logical flow to restore operation:

Check the Display: Does the display show bb (Baseblock) flashing before you try to run? If so, the safety circuit is open.
Check for Faults: Verify there are no other active alarms (e.g., overvoltage) lingering in the background. Clear all alarms.
Signal Isolation:
- Disconnect the PLC cable (the CN1 connector on Sigma drives).
- Attempt to run the drive locally using the Digital Operator/Keypad.
- If it runs locally, the issue is your PLC logic or external wiring sending a constant "Stop" or "Baseblock" signal.
Cycle Power: While not ideal, a full power cycle can clear an internal logic latch that is stuck in an Exclusive wait state.

The "Exclusive" Repair vs. Replacement Decision Matrix

Phase 4: Parameter Initialization (The Last Software Hope)

Some Yaskawa drives allow a "communication bus reset" via parameters. Enter Programming Mode:

Set A1-04 = 0 (Disable password).
Set o2-01 (LCD contrast) to any different value, then back to original. This forces a soft reset of the operator driver.
Perform a 2-LEVEL initialization (A1-03 = 2220 or 3330 depending on drive series). Warning: This erases motor parameters. Backup first.

Phase 2: The Voltage Ripple Test (Exclusive Step)

You need an oscilloscope or a true-RMS multimeter with a bandwidth of at least 100kHz.

Target pins: On the RJ45 connector, measure between pin 1 (+5V) and pin 2 (GND).
Acceptable ripple: <30mV RMS.
If ripple >100mV RMS: Your control board capacitors are failing. A replacement control board (or re-capping by a specialist) is the only fix. Replacing the operator will not help.

If Fault Persists

Install a line reactor or power conditioning equipment
Use a larger drive (if line impedance is high)
Consider a DC bus hold-up unit (e.g., Yaskawa DCP option)

If all external checks pass and the fault remains even with stable input power, the drive’s DC bus sensing circuitry may have failed — contact Yaskawa support or an authorized repair center.

The Yaskawa error code A.910 is an Overload Warning for servo drives, typically found in the Sigma-3, Sigma-5, and Sigma-7 series. It serves as a precursor to more severe "hard" overload alarms like A.710 (instantaneous maximum load) or A.720 (continuous maximum load). A.910 Overload Warning Summary

Definition: This warning triggers when the drive detects it is nearing its overload limit. If ignored, the drive will eventually shut down with a full overload fault to prevent hardware damage. Primary Causes:

Mechanical Overload: The load on the motor exceeds its rated capacity, or there is physical resistance/jamming in the machinery.

Wiring Issues: Incorrect or loose motor/encoder wiring can cause irregular current draws.

Environmental Factors: Excessive ambient temperatures (above 40°C–55°C) inside the SERVOPACK panel.

Parameter Settings: The overload warning level (often parameter Pn52B) may be set too low for the application. Troubleshooting & Corrective Actions Using Stall Prevention to Suppress Overloads - Yaskawa

Understanding Yaskawa Error Code A910 Exclusive: Causes, Symptoms, and Solutions

Yaskawa is a renowned Japanese company that specializes in the production of high-quality industrial robots, servo drives, and other automation equipment. Their products are widely used in various industries, including manufacturing, automotive, and food processing. However, like any complex machinery, Yaskawa equipment can sometimes encounter errors, one of which is the A910 exclusive error code. In this article, we will delve into the details of the Yaskawa error code A910 exclusive, its causes, symptoms, and most importantly, provide solutions to resolve this issue.

What is Yaskawa Error Code A910 Exclusive?

The A910 exclusive error code is a specific fault code that appears on Yaskawa servo drives, particularly on the Σ (Sigma) series. This error code indicates a problem with the servo drive's internal memory or the encoder's communication. When the servo drive detects an error, it immediately stops the motor and displays the A910 error code on the drive's display panel. The "exclusive" term refers to the fact that this error code is specific to certain Yaskawa servo drive models. It is hardware-locked – You cannot clear this

Causes of Yaskawa Error Code A910 Exclusive

Several factors can contribute to the occurrence of the A910 exclusive error code. Some of the most common causes include:

Internal Memory Error: The servo drive's internal memory may become corrupted or damaged, preventing the drive from functioning properly.
Encoder Communication Error: The encoder, which tracks the motor's position and speed, may experience communication issues with the servo drive, leading to the A910 error code.
EEPROM (Electrically Erasable Programmable Read-Only Memory) Error: The EEPROM stores configuration data and parameters for the servo drive. An error in the EEPROM can cause the A910 exclusive error code.
Firmware Issues: Outdated or corrupted firmware can lead to compatibility problems and errors, including the A910 exclusive error code.
Hardware Failure: In some cases, a hardware failure, such as a faulty servo drive or motor, can cause the A910 error code.

Symptoms of Yaskawa Error Code A910 Exclusive

When the A910 exclusive error code appears, you may notice the following symptoms:

Motor Stoppage: The motor will immediately stop operating when the error code is detected.
Error Code Display: The A910 exclusive error code will be displayed on the servo drive's display panel.
Alarm or Fault Light: The servo drive's alarm or fault light may illuminate to indicate an error.
System Instability: In some cases, the error code may cause system instability, leading to unpredictable behavior or oscillation.

Solutions to Yaskawa Error Code A910 Exclusive

Resolving the A910 exclusive error code requires a systematic approach. Here are some steps to help you troubleshoot and fix the issue:

Restart the Servo Drive: Sometimes, a simple power cycle can resolve the error code. Turn off the servo drive, wait for a few seconds, and then turn it back on.
Check the Encoder Connection: Verify that the encoder connection is secure and not damaged. Check for any signs of wear or corrosion on the encoder cable or connector.
Update Firmware: Ensure that the servo drive's firmware is up-to-date. Consult the Yaskawa documentation or contact their support team for guidance on updating the firmware.
Reset EEPROM: If the error code persists, try resetting the EEPROM to its default settings. This may require a specific procedure, so refer to the Yaskawa documentation or contact their support team.
Replace the Servo Drive or Motor: In some cases, a hardware failure may require replacement of the servo drive or motor. Consult Yaskawa's support team or a qualified technician for assistance.

Preventive Measures

To minimize the occurrence of the A910 exclusive error code, follow these preventive measures:

Regular Maintenance: Regularly inspect and maintain the servo drive and motor to prevent wear and tear.
Firmware Updates: Keep the servo drive's firmware up-to-date to ensure compatibility and resolve known issues.
Proper Configuration: Ensure that the servo drive is properly configured and parameterized for the specific application.
Environmental Checks: Verify that the operating environment meets Yaskawa's specifications, including temperature, humidity, and vibration.

Conclusion

The Yaskawa error code A910 exclusive can be a challenging issue to resolve, but by understanding its causes, symptoms, and solutions, you can minimize downtime and ensure optimal performance of your Yaskawa equipment. Remember to follow preventive measures to reduce the likelihood of encountering this error code. If you're unsure about any aspect of troubleshooting or resolving the A910 exclusive error code, consult Yaskawa's support team or a qualified technician for assistance.

Additional Resources

For more information on Yaskawa error codes, including the A910 exclusive error code, consult the following resources:

Yaskawa official website: www.yaskawa.com
Yaskawa documentation: Refer to the servo drive's user manual or technical documentation for specific error code information.
Yaskawa support team: Contact Yaskawa's support team for personalized assistance with troubleshooting and resolving the A910 exclusive error code.

By following the guidelines and solutions outlined in this article, you should be able to resolve the Yaskawa error code A910 exclusive and ensure smooth operation of your Yaskawa equipment.