A910 ((exclusive)) - Yaskawa Error Code
Technical Explanation: Yaskawa Error Code A910
Meaning: Main Circuit PCB (Printed Circuit Board) Undervoltage Detection
Common On: Yaskawa V1000, J1000, U1000, GA500, and other similar drives.
Description: This alarm triggers when the voltage in the main DC bus (the large capacitors that store energy) drops below a specified threshold while the drive is not running a motor. It’s a standby undervoltage.
Key Difference from A9B0:
- A910 (Undervoltage – Standby): Happens when the drive is stopped. The drive is warning you that the incoming power is too low, but it hasn’t tried to run yet.
- A9B0 (Undervoltage – During Run): Happens while the motor is running. This is more serious and can cause the motor to lose torque.
Common Causes for A910:
- Input Power Loss (L1, L2, L3): One or more phases of the incoming AC power are missing or severely distorted.
- Low Supply Voltage: The main voltage (e.g., 480V or 240V) has dipped below ~70% of nominal.
- Soft Charge Relay Failure: The drive’s internal pre-charge relay didn’t close properly, keeping a resistor in the circuit that limits voltage.
- Main Circuit Capacitor Deterioration: Old or failing capacitors cannot hold the charge.
- Magnetic Contactor Opening: An external contactor feeding the drive opened while the drive was still powered on.
Troubleshooting Steps:
- Measure voltage at L1, L2, L3. Verify it matches the drive’s rating.
- Check for loose wiring or tripped circuit breakers.
- Cycle power (remove, wait 5 minutes, reapply).
- If voltage is fine and the alarm persists, the internal power board is likely failing.
Which Yaskawa Drive Series Are Affected?
While error codes vary, A910 appears prominently in the following series: yaskawa error code a910
- Yaskawa GA800 (most common in new installations)
- Yaskawa GA700
- Yaskawa A1000 (high-performance vector drives)
- Yaskawa V1000 (compact general purpose)
- Yaskawa U1000 (regenerative drives)
Note: In the older V7 or G5 series, similar functionality might be labeled as CF (Current Offset Fault). Always refer to your specific drive’s technical manual.
Primary Causes
| Cause | Description |
|-------|-------------|
| Motor cable break | Open circuit in U, V, or W phase cable |
| Motor winding failure | Open or severely imbalanced motor winding |
| Contactor/MCCB issue | Output contactor opened or faulty |
| Phase loss due to loose terminal | Loose connection at drive output or motor terminals |
| Current sensor failure | Rare, but possible internal drive hardware issue | Technical Explanation: Yaskawa Error Code A910 Meaning: Main
Step 1: Simple Reset & Power Cycle
- Record all current parameters (if accessible).
- Perform a drive reset via the digital operator (
STOP + RESET).
- Power cycle the entire drive (disconnect input power for 60 seconds, then reapply).
- If the fault clears and does not return, monitor for recurrence. A one-time glitch may be due to a power disturbance.
Decoding Yaskawa Error Code A910: Causes, Consequences, and Complete Troubleshooting Guide
What is A910?
A910 is an alarm (not a fatal fault). It indicates that the drive has detected a loss of current in one or more of the drive’s output phases (U, V, W) while the drive is running.
⚠️ If the alarm persists or occurs under load, the drive may trip on a more serious fault (e.g., LF, PF). A910 (Undervoltage – Standby): Happens when the drive
Step 2: Visual Inspection
- Check all output terminals (U, V, W) for burning, looseness, or corrosion.
- Inspect motor cable for cuts, kinks, or melted insulation.