yaskawa error code a910

Yaskawa error code A910 is not a fault to be taken lightly. It indicates that the drive’s ability to measure motor current is compromised. While the fix can range from a simple auto-tune calibration to a full control board replacement, the diagnostic approach is logical and stepwise.

Summary Action Plan:

By understanding the meaning of A910 and following the structured troubleshooting steps outlined in this article, you can minimize downtime, avoid unnecessary motor replacements, and make an informed decision about repairing or replacing your Yaskawa drive.

Remember: Always keep your Yaskawa drive manual handy. The exact parameter numbers and reset procedures vary slightly between drive series, so cross-reference this guide with your specific model’s technical documentation.

Need immediate help? Contact Yaskawa America Technical Support at 1-800-927-5292 or your local authorized drive repair center.

The Yaskawa error code Overload Warning typically found on Sigma-7 series servo drives

. It acts as a preventative alert, signaling that the system is approaching a more severe (Instantaneous Maximum Load) or (Continuous Load) trip. Meaning and Impact Warning, Not a Hard Fault:

Unlike "Major Faults" that immediately coast the motor to a stop, the A.910 code is a warning. If you continue operation without addressing the cause, the drive will eventually trigger a full overload alarm and stop. Threshold:

It occurs when the motor operation exceeds the overload protection characteristics defined in the drive's parameters. Primary Causes Mechanical Load Issues:

Excessive physical load on the motor due to friction, a jammed mechanism, or an undersized motor for the application. Wiring Faults:

Incorrect wiring or faulty contacts between the servomotor and the encoder. Parameter Settings: The overload warning level (specifically parameter

) may be set too low or is unsuitable for the current operating conditions. Hardware Failure: In rare cases, a failure within the unit itself can trigger false warnings. Recommended Solutions Check Mechanicals:

Verify the machine is moving freely and that there are no physical obstructions or excessive friction. Verify Wiring:

Ensure all encoder and motor power cables are securely connected and follow the Yaskawa Sigma-7 Wiring Diagrams Adjust Operating Cycle:

Reduce the speed, acceleration, or duty cycle to lower the average load on the motor. Parameter Adjustment:

If the load is within safe limits but the warning persists, adjust parameter to a more appropriate level using or the digital operator. Replace SERVOPACK:

If the warning occurs immediately at power-up without a load attached, the Yaskawa SERVOPACK may need professional repair or replacement. for adjusting the parameter on your drive? Σ-7C SERVOPACK - Troubleshooting Manual

Yaskawa error code A.910 is primarily a rather than a hard fault, indicating an Overload Warning in Yaskawa SERVOPACKs. LK Automation Limited

It serves as a "pre-alarm" to notify you that the motor is approaching its limit and is about to trigger a critical overload alarm, such as (instantaneous maximum load) or (continuous maximum load). LK Automation Limited Key Details & Troubleshooting What it means

: The drive has detected that the motor is operating near its rated capacity for a sustained period. If the workload isn't reduced, the system will trip a full alarm and shut down. Common Causes Mechanical jams or increased friction in the machine.

Large load inertia combined with rapid acceleration or deceleration rates. Operating the motor beyond its rated output for too long. Recommended Actions Reduce the Load

: Lighten the mechanical workload or slow down the cycle time. Check Mechanics

: Inspect for binding, lubrication issues, or physical obstructions in the drivetrain. Adjust Parameters

: If the warning is triggering too early despite normal operation, review the overload warning level settings (e.g., Pn52b in some models) to ensure they match your application requirements. LK Automation Limited Other Variations If you are seeing

on a Yaskawa robot controller (like the FS100), it indicates a

related to the control board, which usually requires checking internal connections or replacing the CPU unit. Yaskawa Knowledge Center specific SERVOPACK model

you are using so I can provide the exact parameter list for that drive?

In the world of precision manufacturing, the Yaskawa error code is a common "warning" sign that something is pushing your servo system to its limits. Unlike a hard "fault" that shuts everything down instantly, this code acts as a cautionary tale—a is imminent if things don't change. Blodgett Ovens The Story of the Strained Servo Imagine a high-speed packaging line where a Yaskawa

servo drive is the heart of the operation. One afternoon, the display suddenly flickers with the code

. The machine doesn't stop yet, but the "warning" light is a clear signal that the drive is feeling the pressure. 1. The Unexpected Resistance The most common cause of the A.910 is a mechanical struggle

. In our story, a small piece of debris has wedged itself into the conveyor track. The motor is now fighting to move the same load, drawing more current than usual to overcome this new friction. The drive notices this increased effort and throws the

code to let the operator know that the system is operating beyond its comfortable "overload protection characteristics". 2. The Heavy Lift Sometimes, the story isn't about a jam but about exceeding capacity

. If the production manager decides to increase the weight of the packages or the speed of the line without recalibrating, the servo may find itself in a permanent state of "excessive load". The A.910 warning appears because the motor is being asked to do more than it was designed for, or because the Overload Warning Level (Pn52B) parameter is set too low for the current job. 3. The Silent Connection Issue

In some cases, the problem isn't the load at all, but a "whisper" that didn't make it through. Incorrect wiring faulty contact

in the power or encoder cables can cause erratic readings. The drive misinterprets these signals as a struggle to move, triggering the warning even if the mechanics are perfectly smooth. How the Story Ends (Troubleshooting)

To resolve the A.910 and prevent it from turning into a full machine shutdown, operators typically follow these steps: Clear the Path

: Inspect the mechanical system for jams, lack of lubrication, or worn-out bearings that might be adding friction. Check the Load : Use the drive's monitor function (like

for accumulated load ratio) to see if the motor is actually being pushed past its rated capacity. Verify Settings : Ensure the

parameter (overload warning level) is appropriate for the application. Inspect Wiring

: Tighten all connections and check for damaged cables that might be causing signal "noise". Yaskawa America

If the warning persists despite these checks, it may indicate an internal SERVOPACK fault

, signaling that it’s time for a professional repair or replacement. MachMotion to change when this warning triggers? Sigma Series SGM/SGMP/SGDA USER'S MANUAL - Yaskawa

The Yaskawa error code A.910 is an Overload Warning. It is a proactive alert indicating that the servomotor is operating at a load level that will soon trigger a hard fault (A.710 or A.720) if the condition persists. 🛠️ Understanding A.910: Overload Warning

Unlike a "Fault" (which immediately stops the motor), a "Warning" allows the motor to continue running while notifying the operator of an impending issue. Primary Causes

Mechanical Binding: Excessive friction or a physical obstruction in the machinery.

Incorrect Sizing: The motor’s rated torque is too low for the current load inertia or application demands.

Rapid Acceleration: Aggressive acceleration/deceleration ramps are drawing excessive current.

Wiring Issues: Poor connections between the SERVOPACK and the motor. 🔍 Troubleshooting Steps

If your display shows A.910, follow these steps to prevent a full system shutdown: 1. Check the Mechanical Load

Inspect the hardware: Rotate the motor shaft manually (if safe) to check for physical resistance.

Lubrication: Ensure all bearings, gears, and slides are properly lubricated to reduce friction. 2. Verify Parameter Settings

Check Pn520: This parameter often controls the position error pulse overflow; if set too tight, it can mimic overload behavior.

Acceleration/Deceleration: Increase the "S-curve" or ramp times to reduce the instantaneous torque required from the motor. 3. Monitor Real-Time Data Use the SigmaWin+ software to monitor the Torque Reference.

If the torque reference is consistently above 100% of the motor's rated capacity, the load must be reduced. 4. Hardware Inspection

Cables: Ensure the motor and encoder cables are not damaged or experiencing interference.

Brakes: Verify that the motor's mechanical brake is fully releasing when the servo is turned ON. ⚠️ Impending Faults (The "Next Step")

If A.910 is ignored, the drive will eventually transition into one of these hard faults: A.710: Instantaneous Overload (High Load). A.720: Continuous Overload (Low Load). To help you resolve this faster, could you tell me:

What series of Yaskawa drive are you using (e.g., Sigma-5, Sigma-7, GA700)?

Is the error happening during a specific movement or while the motor is holding position?

Have there been any recent mechanical changes to the machine? Using Stall Prevention to Suppress Overloads - Yaskawa

The Yaskawa A.910 error code is a common Overload Warning typically found on Sigma-series servo drives, such as the Sigma-7, Sigma-5, and Sigma-3. It serves as a pre-alarm notification that the motor or drive is operating near its thermal limit, allowing operators to intervene before a full shutdown (like an A.710 or A.720 fault) occurs. Understanding the A.910 Alarm

Unlike a hard "Fault," the A.910 is classified as a Warning. This means the motor will generally continue to run, but the drive’s digital operator will flash the code to indicate that the operation has exceeded the overload protection characteristics. Primary Causes and Remedies Potential Cause Recommended Remedy Mechanical Obstruction

Check the machine for jams, excessive friction, or worn bearings that increase the physical load on the motor. Wiring Issues

Verify that the servomotor and encoder cables are correctly wired and that there are no faulty contacts or loose connections. Operational Overload

Reduce the operation speed, lower the cycle frequency, or decrease the overall load applied to the motor. High Ambient Temp

Ensure the SERVOPACK panel temperature is below 55°C. Check cooling fans and ventilation filters for clogs. Parameter Settings

Check parameter Pn52B (Overload Warning Level). If it is set too low for your application, it may trigger the warning prematurely. Troubleshooting Steps

Monitor Current Consumption: Use the drive's monitor mode (e.g., Un002 for torque reference) to see if the motor is consistently drawing current near its rated limit.

Clear the Warning: If the cause is temporary, you can often clear the warning by cycling the power or using a "Warning Reset" command via the digital operator or SigmaWin+ software.

Check Hardware Integrity: If the warning persists even with no load, the internal current detection circuit of the SERVOPACK may be faulty, requiring a replacement of the drive unit.

For robotic applications specifically using the FS100 controller, a similar code (0910) may indicate a CPU Error, typically requiring a controller restart or hardware inspection.

Understanding and Fixing Yaskawa Error Code A.910 If your Yaskawa Sigma-series servo drive is flashing A.910, you are dealing with an Overload Warning. While it hasn't tripped a full fault yet, the drive is alerting you that the motor is operating near its thermal or torque limits, and a full shutdown (typically A.710 or A.720) is likely if conditions don't change. What is A.910?

The A.910 code indicates that the load on the motor has exceeded a specific threshold for a set amount of time. It acts as a preventive "pre-alarm" to help operators intervene before the system halts production. Common Causes

Mechanical Bind or Jam: Increased friction in the machine’s mechanical parts (bearings, slides, or gears) is forcing the motor to work harder.

Operating Cycle Too Intense: Rapid acceleration/deceleration or high-frequency cycling that exceeds the motor's rated capacity.

Incorrect Parameter Settings: The overload warning level (Pn52B) might be set too low for your specific application.

Wiring Errors: Faulty contact or incorrect wiring between the Servomotor and the SERVOPACK can cause inefficient power delivery.

Hardware Failure: In rare cases, a failing SERVOPACK or motor internal encoder can trigger false or premature overload warnings. Troubleshooting and Remedies

Check Mechanics: Manually inspect the load. Ensure there are no physical obstructions and that all parts are properly lubricated.

Verify Wiring: Ensure the motor and encoder cables are securely connected and free of damage. High-resistance connections can lead to increased current draw.

Monitor Load: Use the drive’s monitoring functions to check the effective torque reference. If the average torque is consistently above 100%, you may need to reduce the load or the duty cycle.

Adjust Warning Threshold: Check parameter Pn52B (Overload Warning Level). The default is typically 20%, but it can be adjusted to better suit your operation's normal peaks.

Upsize if Necessary: If the mechanics are fine but the alarm persists during normal operation, the motor capacity may be insufficient for the application. Important Note: A.910 vs. A.810

Be careful not to confuse A.910 with A.810, which is an Absolute Encoder Backup Error. A.810 occurs when the battery power is lost or the encoder is disconnected during power-off. Unlike the overload warning, A.810 requires an absolute encoder reset and a power cycle to clear.

For more technical details, you can consult resources like the Click2Electro Guide or the Yaskawa Sigma-7 Manual.

In the world of high-precision motion control, the Yaskawa error code A.910 is a specific warning signal used primarily in Sigma-5 and Sigma-7 series servo drives.

While it may seem urgent, A.910 is technically a warning (minor fault) rather than a hard alarm. It serves as a preemptive notification that the system is approaching an overload condition. Ignoring this warning typically leads to a full system shutdown via A.710 (Instantaneous Overload) or A.720 (Continuous Overload) alarms. What Does Error Code A.910 Mean?

The A.910 error signifies an Overload Warning. By default, Yaskawa drives trigger this warning when the system reaches 20% of the time required to hit a critical overload alarm threshold. It is a safety feature designed to protect the servomotor from overheating or mechanical damage by giving operators time to adjust the load or duty cycle before a shutdown occurs. Primary Causes of A.910

Several factors can trigger this warning, ranging from mechanical fatigue to improper parameter configuration:

Excessive Mechanical Load: The most common cause is a load that exceeds the motor's rated torque capacity due to mechanical binding or increased friction in the system.

Aggressive Duty Cycles: High-frequency acceleration and deceleration or operating at peak torque for extended periods can build up heat faster than the motor can dissipate it.

Improper Parameter Settings: The threshold for this warning is controlled by parameter Pn52B (Overload Warning Level). If this is set too low (e.g., 10–20%), the warning may appear prematurely during normal operation.

Wiring or Feedback Issues: Faulty contact in the motor or encoder cables can cause the drive to "misread" the torque requirements.

Capacity Mismatch: If the SERVOPACK and servomotor capacities are not properly matched, the drive may struggle to maintain current levels, triggering an early warning. Troubleshooting & Remediation Steps

To resolve an A.910 error and prevent it from escalating to a hard stop, follow these diagnostic steps: Yaskawa.eu.com Σ-7C SERVOPACK - Troubleshooting Manual

The monotone whine of the Yaskawa Sigma-7 servo amplifier was the only sound in the entire packaging line. It was a sound that Elias, the lead robotics technician, usually found comforting—a mechanical heartbeat. But today, the heartbeat had flatlined.

Elias stared at the HMI screen. The conveyor belt was frozen. The robotic arm, usually a blur of yellow metal and precision, hung limp over a pallet of boxed goods. The operators stood back, arms crossed, looking at Elias with the weary expectation of people who knew the shift was about to get much longer.

In the center of the control panel, the tiny seven-segment LED display on the drive blinked a steady, accusing red.

A910.

Elias felt a knot tighten in his stomach. He didn't even need to pull out his phone to check the manual; he knew this one. It was the bogeyman of Yaskawa error codes. The white whale.

"Overload," Elias muttered, wiping grease from his hands with a rag.

"Overload?" asked Sarah, the shift supervisor. "But the arm isn't moving. How can it be overloaded if it’s standing still?"

"That’s the tricky part, Sarah," Elias said, popping the cover off the servo drive cabinet. "A910 isn't just 'I'm carrying too much weight.' It’s 'I'm working too hard to do absolutely nothing.'"

He connected his laptop to the drive’s USB port, firing up the SigmaWin+ software. He needed to see the trace data. The code A910 meant the motor was drawing excessive current for a prolonged period, or the drive estimated that the thermal capacity of the motor was exceeded.

But Elias knew the robot. It was a load-and-unload bot. It barely lifted fifty pounds. It shouldn't be overheating.

He looked at the status monitor. The command speed was zero. The torque reference, however, was spiking at 140%.

"It's fighting a ghost," Elias whispered.

"What?" Sarah leaned in.

"Look at this," Elias pointed to the digital waveform on his screen. "The motor is trying to move, but something is physically locking it in place. The drive is dumping current into the windings to try and overcome the resistance, but it can't, so it trips the overload protection before the motor burns out."

"Brakes?" Sarah suggested. "Maybe the brake didn't release?"

"That was my first guess," Elias said. "But if the brake was stuck, we’d hear it groan or smell burning friction material. This is silent."

Elias walked over to the robot base. The mechanical brake unit was encased in a housing behind the motor. He put his ear close. Nothing. He reached out to nudge the arm manually—it was rock solid. The servo lock was engaged, holding the position with an iron grip.

He went back to the laptop. He disabled the servo lock (Servo Off) and switched the drive to JOG mode. "I'm going to try to jog it forward, one millimeter. Just a tick. Stand clear."

He hit the button. Click. The drive faulted out immediately. A910 reappeared instantly.

"Instant overload," Elias scratched his chin. "That’s not a mechanical jam. A mechanical jam would let it build up torque for a second or two before tripping. This is happening instantly."

He looked back at the motor cables. They were thick, black, industrial things, running from the drive to the motor. He traced the line with his eyes. It looked fine. No cuts, no burns.

But then, he saw it. A faint shimmer in the air near the cable tray.

"Elias, what are you looking at?" Sarah asked, seeing him squint.

"Sparks," Elias said. "Or... the memory of sparks."

He knelt down by the cable tray. During the last maintenance cycle, a zip tie had been pulled too tight around the main power cable (the UVW phases). Over months of the robot's repetitive twisting motion, that sharp plastic edge had slowly sawed its way through the insulation.

Elias gently touched the cable. It was hot. Not warm—hot.

He pulled out his multimeter. He checked the resistance between the U and V phases at the motor disconnect.

Zero.

"A dead short," Elias sighed. "Sarah, we found the ghost."

The cable had worn through, shorting two of the three power phases together

Yaskawa Error Code A910: Overload Warning

Meaning: Low Torque Detection (Pre-alarm / Warning)

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

Have this information ready when calling:

If you have access to the control board, you can use a multimeter (mV DC range) to measure the output of the current sensors directly on the PCB test points (refer to the service manual). Typical healthy offset is less than ±5mV. A910 faults often appear at offsets exceeding ±20-50mV.

Rarely, a corrupted parameter set (especially after a poor upload/download operation) can misconfigure the current offset auto-calibration routine. This is more common after battery-backed memory failures.

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.

The most frequent cause is instability in the facility’s AC grid. Events include:

Key diagnostic: Monitor your facility’s incoming voltage during operation. If the line voltage drops below -15% of nominal, the drive will trip.

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Yaskawa Error Code A910

Yaskawa error code A910 is not a fault to be taken lightly. It indicates that the drive’s ability to measure motor current is compromised. While the fix can range from a simple auto-tune calibration to a full control board replacement, the diagnostic approach is logical and stepwise.

Summary Action Plan:

By understanding the meaning of A910 and following the structured troubleshooting steps outlined in this article, you can minimize downtime, avoid unnecessary motor replacements, and make an informed decision about repairing or replacing your Yaskawa drive.

Remember: Always keep your Yaskawa drive manual handy. The exact parameter numbers and reset procedures vary slightly between drive series, so cross-reference this guide with your specific model’s technical documentation.

Need immediate help? Contact Yaskawa America Technical Support at 1-800-927-5292 or your local authorized drive repair center.

The Yaskawa error code Overload Warning typically found on Sigma-7 series servo drives

. It acts as a preventative alert, signaling that the system is approaching a more severe (Instantaneous Maximum Load) or (Continuous Load) trip. Meaning and Impact Warning, Not a Hard Fault:

Unlike "Major Faults" that immediately coast the motor to a stop, the A.910 code is a warning. If you continue operation without addressing the cause, the drive will eventually trigger a full overload alarm and stop. Threshold:

It occurs when the motor operation exceeds the overload protection characteristics defined in the drive's parameters. Primary Causes Mechanical Load Issues:

Excessive physical load on the motor due to friction, a jammed mechanism, or an undersized motor for the application. Wiring Faults:

Incorrect wiring or faulty contacts between the servomotor and the encoder. Parameter Settings: The overload warning level (specifically parameter

) may be set too low or is unsuitable for the current operating conditions. Hardware Failure: In rare cases, a failure within the unit itself can trigger false warnings. Recommended Solutions Check Mechanicals:

Verify the machine is moving freely and that there are no physical obstructions or excessive friction. Verify Wiring:

Ensure all encoder and motor power cables are securely connected and follow the Yaskawa Sigma-7 Wiring Diagrams Adjust Operating Cycle:

Reduce the speed, acceleration, or duty cycle to lower the average load on the motor. Parameter Adjustment:

If the load is within safe limits but the warning persists, adjust parameter to a more appropriate level using or the digital operator. Replace SERVOPACK:

If the warning occurs immediately at power-up without a load attached, the Yaskawa SERVOPACK may need professional repair or replacement. for adjusting the parameter on your drive? Σ-7C SERVOPACK - Troubleshooting Manual

Yaskawa error code A.910 is primarily a rather than a hard fault, indicating an Overload Warning in Yaskawa SERVOPACKs. LK Automation Limited

It serves as a "pre-alarm" to notify you that the motor is approaching its limit and is about to trigger a critical overload alarm, such as (instantaneous maximum load) or (continuous maximum load). LK Automation Limited Key Details & Troubleshooting What it means

: The drive has detected that the motor is operating near its rated capacity for a sustained period. If the workload isn't reduced, the system will trip a full alarm and shut down. Common Causes Mechanical jams or increased friction in the machine.

Large load inertia combined with rapid acceleration or deceleration rates. Operating the motor beyond its rated output for too long. Recommended Actions Reduce the Load

: Lighten the mechanical workload or slow down the cycle time. Check Mechanics

: Inspect for binding, lubrication issues, or physical obstructions in the drivetrain. Adjust Parameters

: If the warning is triggering too early despite normal operation, review the overload warning level settings (e.g., Pn52b in some models) to ensure they match your application requirements. LK Automation Limited Other Variations If you are seeing

on a Yaskawa robot controller (like the FS100), it indicates a

related to the control board, which usually requires checking internal connections or replacing the CPU unit. Yaskawa Knowledge Center specific SERVOPACK model

you are using so I can provide the exact parameter list for that drive?

In the world of precision manufacturing, the Yaskawa error code is a common "warning" sign that something is pushing your servo system to its limits. Unlike a hard "fault" that shuts everything down instantly, this code acts as a cautionary tale—a is imminent if things don't change. Blodgett Ovens The Story of the Strained Servo Imagine a high-speed packaging line where a Yaskawa

servo drive is the heart of the operation. One afternoon, the display suddenly flickers with the code

. The machine doesn't stop yet, but the "warning" light is a clear signal that the drive is feeling the pressure. 1. The Unexpected Resistance The most common cause of the A.910 is a mechanical struggle

. In our story, a small piece of debris has wedged itself into the conveyor track. The motor is now fighting to move the same load, drawing more current than usual to overcome this new friction. The drive notices this increased effort and throws the

code to let the operator know that the system is operating beyond its comfortable "overload protection characteristics". 2. The Heavy Lift Sometimes, the story isn't about a jam but about exceeding capacity

. If the production manager decides to increase the weight of the packages or the speed of the line without recalibrating, the servo may find itself in a permanent state of "excessive load". The A.910 warning appears because the motor is being asked to do more than it was designed for, or because the Overload Warning Level (Pn52B) parameter is set too low for the current job. 3. The Silent Connection Issue

In some cases, the problem isn't the load at all, but a "whisper" that didn't make it through. Incorrect wiring faulty contact yaskawa error code a910

in the power or encoder cables can cause erratic readings. The drive misinterprets these signals as a struggle to move, triggering the warning even if the mechanics are perfectly smooth. How the Story Ends (Troubleshooting)

To resolve the A.910 and prevent it from turning into a full machine shutdown, operators typically follow these steps: Clear the Path

: Inspect the mechanical system for jams, lack of lubrication, or worn-out bearings that might be adding friction. Check the Load : Use the drive's monitor function (like

for accumulated load ratio) to see if the motor is actually being pushed past its rated capacity. Verify Settings : Ensure the

parameter (overload warning level) is appropriate for the application. Inspect Wiring

: Tighten all connections and check for damaged cables that might be causing signal "noise". Yaskawa America

If the warning persists despite these checks, it may indicate an internal SERVOPACK fault

, signaling that it’s time for a professional repair or replacement. MachMotion to change when this warning triggers? Sigma Series SGM/SGMP/SGDA USER'S MANUAL - Yaskawa

The Yaskawa error code A.910 is an Overload Warning. It is a proactive alert indicating that the servomotor is operating at a load level that will soon trigger a hard fault (A.710 or A.720) if the condition persists. 🛠️ Understanding A.910: Overload Warning

Unlike a "Fault" (which immediately stops the motor), a "Warning" allows the motor to continue running while notifying the operator of an impending issue. Primary Causes

Mechanical Binding: Excessive friction or a physical obstruction in the machinery.

Incorrect Sizing: The motor’s rated torque is too low for the current load inertia or application demands.

Rapid Acceleration: Aggressive acceleration/deceleration ramps are drawing excessive current.

Wiring Issues: Poor connections between the SERVOPACK and the motor. 🔍 Troubleshooting Steps

If your display shows A.910, follow these steps to prevent a full system shutdown: 1. Check the Mechanical Load

Inspect the hardware: Rotate the motor shaft manually (if safe) to check for physical resistance.

Lubrication: Ensure all bearings, gears, and slides are properly lubricated to reduce friction. 2. Verify Parameter Settings

Check Pn520: This parameter often controls the position error pulse overflow; if set too tight, it can mimic overload behavior.

Acceleration/Deceleration: Increase the "S-curve" or ramp times to reduce the instantaneous torque required from the motor. 3. Monitor Real-Time Data Use the SigmaWin+ software to monitor the Torque Reference.

If the torque reference is consistently above 100% of the motor's rated capacity, the load must be reduced. 4. Hardware Inspection

Cables: Ensure the motor and encoder cables are not damaged or experiencing interference.

Brakes: Verify that the motor's mechanical brake is fully releasing when the servo is turned ON. ⚠️ Impending Faults (The "Next Step")

If A.910 is ignored, the drive will eventually transition into one of these hard faults: A.710: Instantaneous Overload (High Load). A.720: Continuous Overload (Low Load). To help you resolve this faster, could you tell me:

What series of Yaskawa drive are you using (e.g., Sigma-5, Sigma-7, GA700)?

Is the error happening during a specific movement or while the motor is holding position?

Have there been any recent mechanical changes to the machine? Using Stall Prevention to Suppress Overloads - Yaskawa

The Yaskawa A.910 error code is a common Overload Warning typically found on Sigma-series servo drives, such as the Sigma-7, Sigma-5, and Sigma-3. It serves as a pre-alarm notification that the motor or drive is operating near its thermal limit, allowing operators to intervene before a full shutdown (like an A.710 or A.720 fault) occurs. Understanding the A.910 Alarm

Unlike a hard "Fault," the A.910 is classified as a Warning. This means the motor will generally continue to run, but the drive’s digital operator will flash the code to indicate that the operation has exceeded the overload protection characteristics. Primary Causes and Remedies Potential Cause Recommended Remedy Mechanical Obstruction

Check the machine for jams, excessive friction, or worn bearings that increase the physical load on the motor. Wiring Issues

Verify that the servomotor and encoder cables are correctly wired and that there are no faulty contacts or loose connections. Operational Overload

Reduce the operation speed, lower the cycle frequency, or decrease the overall load applied to the motor. High Ambient Temp

Ensure the SERVOPACK panel temperature is below 55°C. Check cooling fans and ventilation filters for clogs. Parameter Settings

Check parameter Pn52B (Overload Warning Level). If it is set too low for your application, it may trigger the warning prematurely. Troubleshooting Steps Yaskawa error code A910 is not a fault to be taken lightly

Monitor Current Consumption: Use the drive's monitor mode (e.g., Un002 for torque reference) to see if the motor is consistently drawing current near its rated limit.

Clear the Warning: If the cause is temporary, you can often clear the warning by cycling the power or using a "Warning Reset" command via the digital operator or SigmaWin+ software.

Check Hardware Integrity: If the warning persists even with no load, the internal current detection circuit of the SERVOPACK may be faulty, requiring a replacement of the drive unit.

For robotic applications specifically using the FS100 controller, a similar code (0910) may indicate a CPU Error, typically requiring a controller restart or hardware inspection.

Understanding and Fixing Yaskawa Error Code A.910 If your Yaskawa Sigma-series servo drive is flashing A.910, you are dealing with an Overload Warning. While it hasn't tripped a full fault yet, the drive is alerting you that the motor is operating near its thermal or torque limits, and a full shutdown (typically A.710 or A.720) is likely if conditions don't change. What is A.910?

The A.910 code indicates that the load on the motor has exceeded a specific threshold for a set amount of time. It acts as a preventive "pre-alarm" to help operators intervene before the system halts production. Common Causes

Mechanical Bind or Jam: Increased friction in the machine’s mechanical parts (bearings, slides, or gears) is forcing the motor to work harder.

Operating Cycle Too Intense: Rapid acceleration/deceleration or high-frequency cycling that exceeds the motor's rated capacity.

Incorrect Parameter Settings: The overload warning level (Pn52B) might be set too low for your specific application.

Wiring Errors: Faulty contact or incorrect wiring between the Servomotor and the SERVOPACK can cause inefficient power delivery.

Hardware Failure: In rare cases, a failing SERVOPACK or motor internal encoder can trigger false or premature overload warnings. Troubleshooting and Remedies

Check Mechanics: Manually inspect the load. Ensure there are no physical obstructions and that all parts are properly lubricated.

Verify Wiring: Ensure the motor and encoder cables are securely connected and free of damage. High-resistance connections can lead to increased current draw.

Monitor Load: Use the drive’s monitoring functions to check the effective torque reference. If the average torque is consistently above 100%, you may need to reduce the load or the duty cycle.

Adjust Warning Threshold: Check parameter Pn52B (Overload Warning Level). The default is typically 20%, but it can be adjusted to better suit your operation's normal peaks.

Upsize if Necessary: If the mechanics are fine but the alarm persists during normal operation, the motor capacity may be insufficient for the application. Important Note: A.910 vs. A.810

Be careful not to confuse A.910 with A.810, which is an Absolute Encoder Backup Error. A.810 occurs when the battery power is lost or the encoder is disconnected during power-off. Unlike the overload warning, A.810 requires an absolute encoder reset and a power cycle to clear.

For more technical details, you can consult resources like the Click2Electro Guide or the Yaskawa Sigma-7 Manual.

In the world of high-precision motion control, the Yaskawa error code A.910 is a specific warning signal used primarily in Sigma-5 and Sigma-7 series servo drives.

While it may seem urgent, A.910 is technically a warning (minor fault) rather than a hard alarm. It serves as a preemptive notification that the system is approaching an overload condition. Ignoring this warning typically leads to a full system shutdown via A.710 (Instantaneous Overload) or A.720 (Continuous Overload) alarms. What Does Error Code A.910 Mean?

The A.910 error signifies an Overload Warning. By default, Yaskawa drives trigger this warning when the system reaches 20% of the time required to hit a critical overload alarm threshold. It is a safety feature designed to protect the servomotor from overheating or mechanical damage by giving operators time to adjust the load or duty cycle before a shutdown occurs. Primary Causes of A.910

Several factors can trigger this warning, ranging from mechanical fatigue to improper parameter configuration:

Excessive Mechanical Load: The most common cause is a load that exceeds the motor's rated torque capacity due to mechanical binding or increased friction in the system.

Aggressive Duty Cycles: High-frequency acceleration and deceleration or operating at peak torque for extended periods can build up heat faster than the motor can dissipate it.

Improper Parameter Settings: The threshold for this warning is controlled by parameter Pn52B (Overload Warning Level). If this is set too low (e.g., 10–20%), the warning may appear prematurely during normal operation.

Wiring or Feedback Issues: Faulty contact in the motor or encoder cables can cause the drive to "misread" the torque requirements.

Capacity Mismatch: If the SERVOPACK and servomotor capacities are not properly matched, the drive may struggle to maintain current levels, triggering an early warning. Troubleshooting & Remediation Steps

To resolve an A.910 error and prevent it from escalating to a hard stop, follow these diagnostic steps: Yaskawa.eu.com Σ-7C SERVOPACK - Troubleshooting Manual

The monotone whine of the Yaskawa Sigma-7 servo amplifier was the only sound in the entire packaging line. It was a sound that Elias, the lead robotics technician, usually found comforting—a mechanical heartbeat. But today, the heartbeat had flatlined.

Elias stared at the HMI screen. The conveyor belt was frozen. The robotic arm, usually a blur of yellow metal and precision, hung limp over a pallet of boxed goods. The operators stood back, arms crossed, looking at Elias with the weary expectation of people who knew the shift was about to get much longer.

In the center of the control panel, the tiny seven-segment LED display on the drive blinked a steady, accusing red.

A910.

Elias felt a knot tighten in his stomach. He didn't even need to pull out his phone to check the manual; he knew this one. It was the bogeyman of Yaskawa error codes. The white whale. By understanding the meaning of A910 and following

"Overload," Elias muttered, wiping grease from his hands with a rag.

"Overload?" asked Sarah, the shift supervisor. "But the arm isn't moving. How can it be overloaded if it’s standing still?"

"That’s the tricky part, Sarah," Elias said, popping the cover off the servo drive cabinet. "A910 isn't just 'I'm carrying too much weight.' It’s 'I'm working too hard to do absolutely nothing.'"

He connected his laptop to the drive’s USB port, firing up the SigmaWin+ software. He needed to see the trace data. The code A910 meant the motor was drawing excessive current for a prolonged period, or the drive estimated that the thermal capacity of the motor was exceeded.

But Elias knew the robot. It was a load-and-unload bot. It barely lifted fifty pounds. It shouldn't be overheating.

He looked at the status monitor. The command speed was zero. The torque reference, however, was spiking at 140%.

"It's fighting a ghost," Elias whispered.

"What?" Sarah leaned in.

"Look at this," Elias pointed to the digital waveform on his screen. "The motor is trying to move, but something is physically locking it in place. The drive is dumping current into the windings to try and overcome the resistance, but it can't, so it trips the overload protection before the motor burns out."

"Brakes?" Sarah suggested. "Maybe the brake didn't release?"

"That was my first guess," Elias said. "But if the brake was stuck, we’d hear it groan or smell burning friction material. This is silent."

Elias walked over to the robot base. The mechanical brake unit was encased in a housing behind the motor. He put his ear close. Nothing. He reached out to nudge the arm manually—it was rock solid. The servo lock was engaged, holding the position with an iron grip.

He went back to the laptop. He disabled the servo lock (Servo Off) and switched the drive to JOG mode. "I'm going to try to jog it forward, one millimeter. Just a tick. Stand clear."

He hit the button. Click. The drive faulted out immediately. A910 reappeared instantly.

"Instant overload," Elias scratched his chin. "That’s not a mechanical jam. A mechanical jam would let it build up torque for a second or two before tripping. This is happening instantly."

He looked back at the motor cables. They were thick, black, industrial things, running from the drive to the motor. He traced the line with his eyes. It looked fine. No cuts, no burns.

But then, he saw it. A faint shimmer in the air near the cable tray.

"Elias, what are you looking at?" Sarah asked, seeing him squint.

"Sparks," Elias said. "Or... the memory of sparks."

He knelt down by the cable tray. During the last maintenance cycle, a zip tie had been pulled too tight around the main power cable (the UVW phases). Over months of the robot's repetitive twisting motion, that sharp plastic edge had slowly sawed its way through the insulation.

Elias gently touched the cable. It was hot. Not warm—hot.

He pulled out his multimeter. He checked the resistance between the U and V phases at the motor disconnect.

Zero.

"A dead short," Elias sighed. "Sarah, we found the ghost."

The cable had worn through, shorting two of the three power phases together

Yaskawa Error Code A910: Overload Warning

Meaning: Low Torque Detection (Pre-alarm / Warning)

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

Have this information ready when calling:

If you have access to the control board, you can use a multimeter (mV DC range) to measure the output of the current sensors directly on the PCB test points (refer to the service manual). Typical healthy offset is less than ±5mV. A910 faults often appear at offsets exceeding ±20-50mV.

Rarely, a corrupted parameter set (especially after a poor upload/download operation) can misconfigure the current offset auto-calibration routine. This is more common after battery-backed memory failures.

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.

The most frequent cause is instability in the facility’s AC grid. Events include:

Key diagnostic: Monitor your facility’s incoming voltage during operation. If the line voltage drops below -15% of nominal, the drive will trip.