: Excessive load caused by friction, worn bearings, or physical obstructions in the machine.

: The temperature inside the SERVOPACK panel is too high (exceeding 55°C). Remedies :

Yaskawa drives built between 2015-2020 have a known, unpublished sensitivity on the +5V rail that powers the digital operator. As electrolytic capacitors on the control board age, the +5V line can develop high-frequency ripple. The digital operator requires a clean DC signal. Ripple above 50mV peak-to-peak will corrupt the handshake, triggering A910. A standard multimeter will show "5V" and pass the fault, but an oscilloscope reveals the truth.

The RJ45-style or 14-pin connector between the operator and drive is not gold-plated on standard models. In environments with even trace levels of hydrogen sulfide (paper mills, wastewater treatment), microscopic corrosion increases contact resistance. The drive senses this increased resistance as a "disconnected operator" even though the clip feels tight.

Yaskawa drives feature a "Trial Operation" or "Tuning" mode used for auto-tuning the motor.