Resolving this code promptly is essential to avoid forced machine downtime. This feature guide breaks down the causes, diagnostic steps, and remedies for the A.910 error. 🔍 Quick Reference: A.910 Overview Alarm Name Overload Warning Yaskawa Sigma-5 / Sigma-7 Series SERVOPACKs Primary Meaning
Start by removing the power to the drive and disengaging the motor from the mechanical load.
If your drive uses an option card (e.g., an EtherCAT or DeviceNet card) that shares the same communication bus as the operator port, a conflict in the scan cycle can trigger A910. This is exclusive to drives with firmware versions earlier than 6.0.
| Cause | Explanation | |-------|-------------| | | The relay that bypasses the charging resistor is stuck open. | | Blown charging resistor | The resistor that limits inrush current is open-circuited. | | Low input voltage | Severe brownout or missing phase during power-up. | | DC bus short circuit | An IGBT module failure or external short on DC terminals. | | Control board failure | Rare, but the voltage detection circuit can malfunction. | yaskawa error code a910 exclusive
Check network and bus settings
Loose termination or localized impedance jumps across the power delivery pathway lead to asymmetrical current profiles.
or "Undervoltage during run" The drive detected that the DC bus voltage dropped below the undervoltage detection level while the motor was running . Resolving this code promptly is essential to avoid
Log and monitor
) reduce the drive's ability to dissipate heat, leading to premature overload warnings. Step-by-Step Troubleshooting Guide
High-frequency acceleration/deceleration cycles or a load inertia that exceeds the motor’s design limits. If your drive uses an option card (e
The load on the motor exceeds its rated capacity, or there is physical resistance/jamming in the machinery.
specifically indicates a Digital Operator Connection Fault or a Communication Mismatch between the main control board (MCU) and the connected digital keypad (typically a JVOP-180, JVOP-181, or similar LED/LCD operator).