Yaskawa Error Code A910

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.

Ten minutes later, standing on a scissor lift, she popped the lid off the junction box. A faint smell of ozone hit her. There, wrapped around a ground screw like a black snake, was a melted wire nut. The incoming 480V leg L2 had vibrated loose over five years of non-stop operation. It wasn’t completely off—it was floating , arcing just enough to keep the lights on in the office but dropping the voltage on the drive’s main circuit below 350V. yaskawa error code a910

No. If the drive allows you to clear the fault and run, you risk catastrophic motor or drive damage. The current sensors are critical for vector control and overcurrent protection. Ignoring A910 can lead to IGBT failure and a much more expensive repair. is officially defined by Yaskawa as Main Circuit

Ensure U, V, and W power phases and encoder cables are secure. For a 400V class drive, the undervoltage threshold