(such as Sigma-7, Sigma-5, and Sigma-3). It is not a terminal fault but a proactive alert indicating that the motor is operating near its thermal limit and is at risk of triggering a full overload alarm (A.710 or A.720). Understanding the A.910 Warning
In Sigma 7 SERVOPACKs, the warning sensitivity is governed by the parameter . If this parameter is set too low (e.g., below the factory default of 20%), the drive will throw an A.910 code during entirely normal, safe operating profiles. 5. High Cabinet Temperatures or Hardware Failure
[Mechanical Bind / Friction] ββββ [Incorrect/Faulty Wiring] βββββββΌββββΊ [Excessive Motor Current] ββββΊ A.910 Warning [Aggressive Motion Profile] βββββ€ [Improper Parameter Pn52B] ββββββ 1. Mechanical Resistance and High Friction
Troubleshooting the Yaskawa A.910 Warning: The Definitive Guide
Check parameter Pn52B (Overload Warning Level). This parameter dictates at what percentage of the absolute maximum load the A.910 warning should flag. If it is set abnormally low (e.g., 20% or 30%), it triggers prematurely. yaskawa error code a910 link
Decouple the servomotor from the load. Manually turn the machine shaft to verify that the axis moves smoothly across its full travel length. Inspect for debris or mechanical misalignment. 2. Undersized Servomotor or Aggressive Motion Profiles
Based on Yaskawa documentation and field experience, the A910 warning can be triggered by several primary factors:
The factory hummed like a living thingβmotors whispering, conveyors breathing, and the faint, patient tick of a clock that kept everyone honest. Lin, the night-shift technician, liked to think of it as orchestral: every servo a violin, each sensor a cymbal. Tonight, however, a sour note cut through the music: a steady orange lamp on Panel H, and the display reading A910.
It occurs when the SERVOPACK fails to establish a stable, continuous communication link with the encoder (linear scale) or the serial converter unit. This failure means the drive can no longer read the absolute position of the motor, making controlled motion impossible. Common Causes for A910 (such as Sigma-7, Sigma-5, and Sigma-3)
The overload warning level (Pn52B) might be set too low for the specific application.
Follow these steps in order to diagnose and resolve the A910 error efficiently. 1. Check Cable Integrity and Connections
If the warning persists despite mechanical and wiring checks, the SERVOPACK internal circuitry may be faulty and might require replacement. using the SigmaWin+ software? Yaskawa Servo Drive Alarm Codes Guide | PDF - Scribd
For detailed wiring diagrams or specific parameter lists, refer to the Yaskawa Sigma-5 Troubleshooting Manual Sigma-7 Troubleshooting Guide specifically for your model? Ξ£-7C SERVOPACK - Troubleshooting Manual If this parameter is set too low (e
If the PLC goes into "Stop" mode or loses power, the drive will trigger A910.
This feature effectively tells the operator: "The motor is running hot; reduce the load or check the system before the drive shuts you down."
Try swapping the drive with a known working unit to isolate the issue. Summary of Potential Solutions Potential Cause Excessive Load / Friction Reduce load or repair mechanical binding. Wiring Faulty/Loose Encoder Cable Secure or replace cable; ensure proper shielding. Parameters Pn52B set too low Increase the overload warning level (Pn52B). Drive Internal Servo Failure Replace the Servopack. Conclusion