Yaskawa Error Code A910 Exclusive -

The Yaskawa error code A910 (often displayed as A.910) indicates a "Momentary Power Loss" or "Undervoltage during Run" fault on Yaskawa AC drives (e.g., A1000, V1000, J1000, GA500, GA800 series).

How to Clear / Reset A910

• Auto-reset: Set L5-01 (Number of Auto Restart Attempts) to 1 or 2. The drive will attempt to resume after power returns.
• Manual reset: Cycle input power off → wait for charge light to die → power on. OR send a reset signal via terminal (set H1-oo = 7E).
• Digital Operator: Press STOP/RESET key (if fault is active and drive is stopped).

For A1000, U1000, and Z1000 Drives

• Cause: Aging ribbon cable inside the drive door.
• Exclusive fix: The digital operator connects to the main board via a flexible flat cable (FFC). These cables develop micro-cracks. Gently flex the cable with the drive powered on. If A910 appears/disappears as you wiggle it, replace the FFC (part number specific to your drive). Do not simply hot-glue it; the cracks propagate.

Troubleshooting Step-by-Step

If you encounter A910, follow this logical flow to restore operation: yaskawa error code a910 exclusive

1. Check the Display: Does the display show bb (Baseblock) flashing before you try to run? If so, the safety circuit is open.
2. Check for Faults: Verify there are no other active alarms (e.g., overvoltage) lingering in the background. Clear all alarms.
3. Signal Isolation:
   • Disconnect the PLC cable (the CN1 connector on Sigma drives).
   • Attempt to run the drive locally using the Digital Operator/Keypad.
   • If it runs locally, the issue is your PLC logic or external wiring sending a constant "Stop" or "Baseblock" signal.
4. Cycle Power: While not ideal, a full power cycle can clear an internal logic latch that is stuck in an Exclusive wait state.

3. Parameter Conflict (Digital Operator vs. PLC)

This occurs frequently during commissioning. The drive is receiving conflicting commands regarding who is the "Master." The Yaskawa error code A910 (often displayed as A

• The Conflict: You are trying to jog the motor using the digital keypad on the front of the drive, but the drive is parameterized to look for an external PLC for commands (or vice versa).
• The Exclusive State: The drive sees an active signal on the external control terminals and refuses to accept the local keypad command because external control is "Exclusive."
• Resolution:
  • If using the keypad to JOG: Disconnect the external PLC command cable or ensure no "Run" signals are active on the input terminals.
  • Check Parameter o2-01 (or similar depending on series) which dictates the frequency reference source and run command source.

Step-by-Step Exclusive Troubleshooting (Do Not Skip)

If you follow a generic manual, you will waste hours. Use this Yaskawa A910-exclusive diagnostic flow instead. Auto-reset: Set L5-01 (Number of Auto Restart Attempts)

Parameter Adjustments (to reduce sensitivity if power quality is marginal)

| 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.