Yaskawa Error Code A910 Exclusive

Yaskawa Error Code A910 Exclusive

Yaskawa Error Code A910 (Exclusive) — Troubleshooting Guide

Yaskawa Error Code A910: Understanding the “Exclusive” Alarm

In the world of industrial automation, Yaskawa drives (specifically the GA800, GA700, A1000, and U1000 series) are known for their reliability. However, when an error code appears, it demands immediate attention. Among the various alarms, Error Code A910 stands out as particularly “exclusive” due to its specific cause: it is a hardware-exclusive alarm related to the drive’s charging circuit.

2. The "Soft" Stop: Alarm History or Trip State

If the drive has recently experienced a minor fault that was cleared but not fully reset, the drive may remain in a "Trip" state. yaskawa error code a910 exclusive

  • The Conflict: The drive is physically ready, but the internal logic is paused.
  • The Exclusive State: The drive is holding an "Exclusive" wait state, requiring a specific reset command before it accepts motion commands.
  • Resolution: Cycle the "Servo On" signal (often signal S-ON). Turn the Servo Off, wait for the display to indicate "bb" (Baseblock) or "run" stopped, and then turn Servo On again.

Affected equipment

  • Yaskawa AC drives (VFDs), motion controllers (Sigma, MPiec), servo drives, and networked I/O modules that support exclusive sessions or ownership controls.

What A910 Means

  • The drive detected that the DC bus voltage dropped below the undervoltage detection level while the motor was running.
  • This is typically caused by a brief interruption or dip in the input power supply (lasting longer than the drive's permissible 15–60 ms, depending on the model).

Immediate safe actions

  1. Put the machine in a safe state: stop motion, engage brakes, and follow plant lockout/tagout procedures.
  2. Do not power-cycle equipment on a live machine where motion could unexpectedly resume.
  3. Notify control-room/operations that you’re performing maintenance.

3. Pin Corrosion or Micro-Fretting

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. The Conflict: The drive is physically ready, but