An overload warning triggers when the servo drive detects that the current drawn by the motor exceeds its continuous thermal and electrical limits over a given period. Five primary factors cause this anomaly:
: Use an infrared thermometer to verify that the motor body surface temperatures align with continuous operations standards.
To safely clear the A.910 warning and safeguard your machine hardware from permanent thermal degradation, execute these technical troubleshooting protocols:
(Vdc controller configuration) is set correctly for your application. Related Yaskawa Fault Codes
Older firmware versions had a bug where A910 would appear after a power cycle if the option card was running the latest firmware. Connect Yaskawa’s DriveWizard software and check for updates. Go to . yaskawa error code a910 link
The programmed motion profile strains the physical limits of the hardware. Duty cycles with minimal dwell/rest time. Fast acceleration and deceleration profiles.
The machinery is asking the motor to do more work than its physical profile allows. This happens frequently after a product line changeover, recipe modification, or cycle time speed-up.
Communication error between the drive and the keypad, option board, or host controller.
✅ The error is clearly communication-related. ⚠️ Difficulty: Requires basic parameter checking and cabling inspection – moderate for inexperienced users. 🔧 Fixability: Often solved by reseating cables or adjusting parameters; hardware failure less common. 📘 Documentation: Yaskawa manuals provide good diagnostic steps. An overload warning triggers when the servo drive
If the mechanical load is within spec, check parameter Pn52B to ensure the warning threshold is appropriate for your operation.
: Faulty contact or incorrect wiring in either the servomotor or encoder cables can cause the drive to misread the load or lose efficiency.
The drive issues this warning when it can no longer keep the DC-link voltage within a safe range, often causing the motor to go into regenerative mode. Check Input Voltage
The motor is operating for extended periods at torques that exceed its ratings, or the starting torque required is too high. Related Yaskawa Fault Codes Older firmware versions had
Increase the dwell (stop) time between moves to allow the motor to dissipate heat. Confirm Wiring
The Yaskawa error code is an Overload Warning (pre-alarm) primarily found in Sigma-series servo drives (Sigma-3, Sigma-5, and Sigma-7) . It serves as a precursor to more severe faults like A.710 (instantaneous overload) or A.720 (continuous overload). Error Summary
Unlike a critical "Alarm," a "Warning" like A.910 may allow the drive to continue running, though it often flashes on the display to alert the operator of impending failure. Amazon.com Common Causes and Remedies
The most common cause of an overload warning is a physical restriction in the automated machinery.