| 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). | Do not confuse A910 with these similar codes:
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. yaskawa error code a910
| Error Code | Name | Key Difference | | :--- | :--- | :--- | | | Main Circuit Overvoltage | DC bus voltage too high (often decel issues) | | A915 | Control Power Undervoltage | Internal 24V/12V logic supply failure | | A910 | Main Circuit Undervoltage | DC bus too low | | UV1 (fault) | Main Circuit Undervoltage (V1000) | Same as A910 but shown as fault, not alarm | | UV3 (fault) | Soft-Charge Circuit Fault | Specific failure of the inrush relay | | Preventive Action | Benefit | | :---
Always start with the simple things—measure your incoming voltage, tighten all connections, and disable momentary power loss ride-thru as a diagnostic step. Do not repeatedly reset the alarm without investigating; each undervoltage event stresses the drive’s front-end components. | | Install a DC Bus Hold-Up Kit
Introduction 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.