Yaskawa Error Code A910 ● «Deluxe»

Yaskawa A910 – Output Phase Loss
✓ Check U, V, W connections
✓ Measure phase-to-phase resistance (should be balanced)
✓ Test motor directly on line power
✓ Inspect output contactor (if used)
✓ Disable detection ONLY for diagnosis

Here is the detailed content regarding the Yaskawa Error Code A910.

This error appears primarily on Yaskawa V1000, J1000, U1000, and GA800 series drives.

While error codes vary, A910 appears prominently in the following series: yaskawa error code a910

Note: In the older V7 or G5 series, similar functionality might be labeled as CF (Current Offset Fault). Always refer to your specific drive’s technical manual.

When the drive is initially powered on, a "soft-charge" resistor limits inrush current to charge the DC bus capacitors. Once charged, a relay or thyristor bypasses this resistor. If the bypass fails:

Another possibility: One or more diodes in the three-phase rectifier bridge have failed, reducing the average DC output.

For advanced users, connect to the drive via software. You can view U1-07 (DC Bus Voltage) as a trend. A ripple pattern on the DC bus suggests bad capacitors. A sudden drop during acceleration suggests wiring or soft-charge issues. Yaskawa A910 – Output Phase Loss ✓ Check

Yaskawa Error Code A910 is an undervoltage alarm of the main DC bus. While it can be a protective response to a brief power glitch, it often points to serious infrastructure issues: loose wires, undersized feeders, aging capacitors, or a failing soft-charge circuit.

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.

By understanding the root causes and following the structured troubleshooting guide above, you can minimize downtime, avoid unnecessary drive replacements, and ensure your Yaskawa automation system runs reliably for years to come.

Need more help? Yaskawa’s technical documentation for your specific drive series (Technical Manual TM.V1000.01, for example) contains detailed timing charts and waveform examples for A910 detection. Always keep the latest manual available for your exact drive revision. Here is the detailed content regarding the Yaskawa

The most frequent cause is instability in the facility’s AC grid. Events include:

Key diagnostic: Monitor your facility’s incoming voltage during operation. If the line voltage drops below -15% of nominal, the drive will trip.

Once you’ve resolved the A910 fault, implement these best practices to prevent recurrence:

In the world of industrial automation, Yaskawa drives (including the popular V1000, J1000, GA700, GA800, and A1000 series) are renowned for their reliability and precision. However, like any sophisticated electronic device, they occasionally encounter issues that bring production lines to a halt. One of the most common yet frequently misunderstood alarms is Yaskawa error code A910.

If you are staring at a drive display flashing A910, you are likely experiencing frustration and urgency to get your machinery back online. This article provides a deep dive into everything you need to know about the A910 fault—what it means, why it happens, and, most importantly, how to fix it permanently.