When operating industrial automation equipment, unexpected downtime is every engineer's worst nightmare. In systems powered by Yaskawa servo drives—particularly the Sigma-7 and legacy Sigma series—encountering an error on the digital operator requires immediate attention.
| Step | Action | Expected Result | | :--- | :--- | :--- | | | Monitor U1-07 (DC Bus Voltage) during normal run. | Should be ~1.35x input voltage (e.g., 540-620VDC for 400V class, 270-310VDC for 200V class). | | 2 | Check L2-05 (Undervoltage detection level). Factory default is usually 380VDC (400V class). If set too high, nuisance A910 occurs. | Lower L2-05 by 5-10% only if power supply is truly unstable. | | 3 | Check L2-01 (Momentary Power Loss Ride-Thru Time). Default = 1.0 sec. | Increase to 2.0 seconds if utility sags are common. | | 4 | Measure input voltage while running at 100% load. | Voltage drop should not exceed 10% from no-load to full-load. |
Ensure cabinet fans are working and internal temperatures are below 55°C. Adjust Pn52B yaskawa error code a910 exclusive
: Triggers if the motor runs continuously under a mild torque load exceeding ratings for an extended period. The servo turns off immediately. Hardware-Specific Variations: Sigma-7 vs. Sigma-3
To resolve the A.910 code, inspect these five common triggers identified in Click2Electro's Sigma 7 Guide Mechanical Load Issues | Should be ~1
Another frequent trigger for A.910 is simply pushing the motor system too hard. This can involve setting a motor acceleration rate too high for the system's inertia or commanding a speed that cannot be physically achieved with the available torque. In either case, the motor ends up operating beyond its "overload protection characteristics" for extended periods, triggering the warning as a protective measure. You may need to lower the acceleration rate or use a filter like Pn217 (Average Position Reference Movement Time) to smooth out the motion reference.
The digital display on a Yaskawa SERVOPACK communicates system statuses through letters and numbers. Codes prefixed with an represent alarms or warnings. If set too high, nuisance A910 occurs
In Yaskawa systems, the error code generally indicates an Overload Warning (pre-alarm) for servo drives or a CPU Error for specific robot controllers. For Yaskawa Sigma-3, Sigma-5, and Sigma-7 Servo Drives
sets the current threshold as a percentage of the motor’s rated current at which the A.910 warning triggers. The default setting is typically 100%, meaning the warning appears when current reaches or exceeds the motor’s rated continuous current.