Yaskawa Error Code A910 Exclusive Link

In Yaskawa terminology, the A910 error does not usually indicate a broken component. Instead, it indicates a conflict of priorities.

The term "Exclusive" in this context refers to the drive’s internal processing hierarchy. The drive has received a command (usually "Run" or "JOG"), but that command is currently "excluded" from execution because another process or safety condition has locked the control.

In simple terms: The drive is saying, "I cannot start moving because something else is currently in control of my state." yaskawa error code a910 exclusive

The fix for A910 varies dramatically by drive series. Here is the exclusive breakdown:

Error A910: "Charge Circuit Fault"

This alarm indicates that the drive’s internal pre-charge circuit has failed to function correctly. In simple terms, when a drive powers up, it must slowly charge its internal DC bus capacitors to prevent a massive inrush of current. The A910 alarm triggers when the drive detects that the DC bus voltage has not risen as expected within a set time frame.

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. In Yaskawa terminology, the A910 error does not

| Parameter | Setting | Effect | |-----------|---------|--------| | L2-05 | 0 (default) / 1 / 2 | Undervoltage detection selection. 0 = standard; 1 = continue operation with reduced torque; 2 = alarm only (continue running) | | L2-11 | 0.0–2.0 sec | Minimum allowable DC bus voltage during undervoltage – increase slightly if nuisance trips occur | | L2-13 | 0.0–2.0 sec | Power loss ride-through time – longer time allows drive to keep running through brief sags (requires appropriate load) |

⚠️ Caution: Changing L2-05 to 2 (alarm only) or increasing ride-through times may cause unpredictable motor behavior if voltage drops too low. Use only when power fluctuations are minor and your process can tolerate reduced torque.