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Yaskawa error code A.910 Overload Warning commonly found in the Sigma-5 and Sigma-7 servo drive series. It acts as a preemptive alert, indicating that the system is approaching a full overload alarm (A.710 or A.720), which would shut down the drive. Core Meaning
This code signals that the motor is operating at a load or torque level that exceeds its continuous rating for a significant period. If ignored, the drive will eventually trip to protect the hardware. Yaskawa America Primary Causes and Solutions Mechanical Overload:
The most common cause is excessive physical load or a mechanical jam.
Inspect the machinery for friction, binding, or unexpected resistance. Incorrect Parameter Settings: The "Overload Warning Level" (Parameter ) might be set too low for your specific application. Verify and adjust Pn52B to a suitable level as per the Yaskawa Sigma-7 Product Manual Wiring Issues:
Poor contact or incorrect wiring between the servomotor and the encoder can trigger false or early warnings.
Ensure all motor and encoder cables are securely connected and correctly wired. Capacity Mismatch:
The motor may be undersized for the required operation/duty cycle.
Reconsider the operating conditions or increase the motor/drive capacity. Hardware Failure: In rare cases, internal failure of the itself can cause this error.
If mechanical and wiring checks pass, the SERVOPACK may need replacement. Summary Table for Quick Reference Alarm Name Overload Warning Related Alarms A.710 (Instantaneous Overload), A.720 (Continuous Overload) Critical Parameter Pn52B (Overload Warning Level) Typical Recovery
Inspect mechanics, verify wiring, or cycle power if intermittent
If the error persists after checking these areas, would you like to troubleshoot a specific Yaskawa drive model or look into parameter adjustment steps AI responses may include mistakes. Learn more Yaskawa Servo Drive Alarm Codes Guide | PDF - Scribd
In Yaskawa systems, the code typically indicates an Overload Warning
. 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
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
The Yaskawa error code A.910 is not a fatal "fault" that stops the machine immediately, but a Warning for Overload. It is essentially the drive’s way of saying, "I am working too hard, and if this continues, I will shut down to protect myself." yaskawa error code a910
Here is a story of a long night on the factory floor, illustrating how this error occurs and how to fix it. The Ghost in the Assembly Line: A Tale of A.910
The clock on the wall of the automotive plant read 2:14 AM when the line stuttered.
Jack, the head maintenance tech, didn't need to hear the alarm to know something was wrong. He could feel it in the floorboards—a subtle change in the vibration of the Sigma-7 servo motors that powered the main conveyor. He walked over to the control panel of the lead SERVOPACK. The small seven-segment display was blinking a steady, rhythmic code: A.910. The Warning Before the Storm "At least it's not an A.710 yet," Jack muttered.
He knew A.910 was the "Overload Warning". It meant the motor was drawing more torque than it was rated for, but hadn't yet reached the breaking point where it would trigger a hard fault (A.710 or A.720) and crash the line. The drive was giving him a chance to fix it before the thermal protection kicked in. The Investigation
Jack started his mental checklist, knowing the common culprits for an A.910: Mechanical Friction: Was a bearing seizing up?
Wiring Issues: Was there a loose contact in the motor or encoder cables?
Parameter Sensitivity: Was the warning level (Pn52B) set too low for the current job? Environment: Was the control cabinet overheating?
He grabbed his infrared thermometer. The SERVOPACK panel was at 48°C—warm, but well below the 55°C limit. Heat wasn't the ghost tonight. Finding the Friction
Jack moved to the conveyor belt itself. He noticed a slight buildup of debris near the drive pulley—metal shavings from the day shift had wedged themselves into the guide rail. Every time the servo tried to accelerate the heavy pallet, it had to fight through that extra resistance. The motor was pulling 110% of its rated torque just to keep up. "There you are," he said. The Resolution
Jack cleared the debris and reapplied high-temp grease to the rails. He returned to the panel and watched the load monitor (Un002). The torque percentage dropped from the "danger zone" back down to a comfortable 65%.
He didn't even have to reset the drive; because A.910 is a warning, it cleared itself once the operating conditions returned to normal. The conveyor sped back up, the "Ghost" was gone, and the factory floor returned to its steady, industrial hum. Technical Summary of A.910 🛠️ Alarm Name Overload Warning Severity
Minor (Warning) - Does not always stop the motor immediately. Triggers
Occurs when torque or current exceeds the rated level for a period of time. Next Step
If ignored, will lead to hard faults A.710 (High Load) or A.720 (Low Load). Common Fixes
Check Mechanicals: Look for jams, binding, or lack of lubrication.
Verify Wiring: Ensure U, V, and W power phases and encoder cables are secure.
Adjust Parameters: Check Pn52B (Overload Warning Level). If the application naturally runs high, this may need to be increased slightly.
Resize Motor: If the load is consistently too heavy, a higher-capacity motor/drive combo may be required. If you are currently facing this error, let me know:
Which Yaskawa series are you using (Sigma-5, Sigma-7, etc.)?
Does the error happen at startup or during a specific movement? Have you recently changed the load or the program? Table 1 - Yaskawa
A very specific question!
The Yaskawa error code A910 is a fault code that appears on Yaskawa servo drives, particularly on the Σ5 (Sigma 5) series. After conducting research, I found that:
Error Code A910: Servo Motor Overheating Yaskawa error code A
The A910 error code indicates that the servo motor has overheated. This can occur due to various reasons such as:
Symptoms:
Troubleshooting steps:
Recommendations:
Rating:
Based on the information provided, I'd rate this error code review as follows:
The Yaskawa error code A.910 is an Overload Warning that indicates a drive is nearing its physical limits. Unlike a hard "fault" that immediately stops the motor, this is a preemptive warning issued before critical overload alarms like A.710 (instantaneous overload) or A.720 (continuous overload) occur. Root Causes and Solutions
When this code appears on a Yaskawa Sigma-3 or Sigma-7 series drive, it is usually triggered by one of the following factors: Mechanical Overload & Load Conditions
Cause: The motor is physically struggling with a load that exceeds its rated torque, or there is mechanical friction (e.g., worn bearings, misalignment).
Solution: Check for mechanical blockages and verify that the load matches the motor's capacity. You may need to reconsider operating conditions or increase motor size. Wiring and Connectivity Issues
Cause: Incorrect or loose wiring in the servomotor or encoder cables can cause faulty feedback, making the drive "think" it is overloading.
Solution: Inspect and secure all connections for the servomotor main circuit and encoder cables. Parameter Settings
Cause: The Overload Warning Level (Pn52B) might be set too low, triggering the warning prematurely even if the motor is within safe operating limits.
Solution: Adjust parameter Pn52B to a more suitable percentage of the rated load according to Click2Electro. Environmental Factors Cause: High temperatures inside the SERVOPACK panel. Solution: Ensure the panel temperature stays below through improved ventilation or cooling fans. Next Steps for Troubleshooting
Monitor Torque: Use the drive’s monitoring tools (like SigmaWin+) to check the actual torque percentage during the operation that triggers the warning.
Verify Hardware: If wiring and load are correct but the error persists after power cycling, the SERVOPACK unit itself may be faulty and require replacement.
Check Previous Alarms: Check the alarm history to see if A.910 frequently leads to A.710 or A.720, which confirms a genuine physical overload.
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 Overload : The motor is subjected to an
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
For advanced users, connect to the drive via software. You can view U1-07 (DC Bus Voltage) as a trend. A ripple pattern on the DC bus suggests bad capacitors. A sudden drop during acceleration suggests wiring or soft-charge issues.
Once you’ve cleared the immediate alarm, implement these preventive measures.
| Preventive Action | Benefit | | :--- | :--- | | Install a Line Reactor | Reduces voltage sags from upstream equipment and mitigates harmonics. | | Use a Three-Phase Line Monitor | Shuts down equipment when voltage drops below 10% of nominal, preventing drive stress. | | Replace Aging Drives | If capacitors are >7 years old in a hot environment, consider proactive replacement. | | Install a DC Bus Hold-Up Kit | Yaskawa offers external capacitor modules that extend ride-through time from 50ms to several seconds. | | Upgrade Wiring | One gauge size larger reduces voltage drop significantly for long runs (>50 feet). |
Meaning: Main Circuit PCB (Printed Circuit Board) Undervoltage Detection Common On: Yaskawa V1000, J1000, U1000, GA500, and other similar drives. Description: This alarm triggers when the voltage in the main DC bus (the large capacitors that store energy) drops below a specified threshold while the drive is not running a motor. It’s a standby undervoltage.
Key Difference from A9B0:
Common Causes for A910:
Troubleshooting Steps:
While a "surge" is more common for overvoltage faults (A900), A910 can occur immediately following a heavy regenerative event. When a motor decelerates too quickly, energy is pushed back into the drive. If the drive’s regenerative circuit or braking resistor isn't adequate, the DC bus voltage spikes, then crashes as the drive attempts to protect itself, sometimes leading to an undervoltage condition.
In the high-stakes world of industrial automation, downtime is costly. When a Yaskawa drive—whether from the V1000, J1000, U1000, GA700, or A1000 series—halts production with Error Code A910, it signals a specific power-related fault. While this alarm can be alarming to operators, understanding its root causes is the first step toward rapid resolution.
Error A910 is officially defined by Yaskawa as Main Circuit Undervoltage. This alarm triggers when the DC bus voltage inside the drive drops below the specified threshold. For a 200V class drive, this typically occurs below approximately 190 VDC (or around 150 VDC for single-phase models). For a 400V class drive, the undervoltage threshold is roughly 380 VDC to 400 VDC, depending on the model and load conditions.
Unlike a fatal fault that requires a manual reset, A910 is often a temporary alarm. However, persistent occurrences indicate deeper electrical issues that can damage the drive’s capacitors and rectifier circuit over time.
