Yaskawa Error Code A910 Guide

Yaskawa Error Code A910: Overload Warning

How to Clear Error Code A910

1. Automatic Reset: If the power restores and the undervoltage condition lasts less than 100ms (or the time set in L2-02), the drive may resume operation automatically.
2. Manual Reset:
   • Press the RESET key on the digital operator (for V1000/A1000, press the arrow up/down to select the alarm, then press RESET).
   • Cycle main input power off, wait for the display to completely blank, then power on again.
3. Terminal Reset: Assign a digital input to function H1-xx = 7 (Fault Reset) and momentarily close the contact.

Note: If the undervoltage condition is still present after resetting, the alarm will immediately reappear.

Troubleshooting Steps

1. Monitor the Current:

   • Check the drive's monitor display (typically U-01 or U-02) during operation. If the current is exceeding the rated current of the motor (found on the motor nameplate) or the rated current of the drive, the warning is valid.

2. Check Parameter Settings:

   • Verify E2-01 (Motor Rated Current) matches the nameplate on the motor exactly.
   • Check L3-02 (Stall Prevention Level during Run). If set to the default (usually 150-160%), try increasing it slightly only if the motor and cabling can handle the extra current.

3. Inspect the Mechanical Load:

   • Disconnect the motor from the load (if possible) and run the motor alone. If the warning disappears, the issue is the mechanical machine (jams, bad bearings, gearbox issues), not the electrical system.

4. Adjust Acceleration Times:

   • Increase the acceleration time (parameter C1-01) to allow the motor to ramp up speed more gently, reducing inrush current.

1. Hardware Failure of Current Sensors (Most Common)

The drive uses one or three current sensors (depending on phase count). Over time, these sensors can drift due to thermal stress, electrical spikes, or simply age. When the sensor outputs a non-zero signal at zero current, the A910 alarm trips. yaskawa error code a910

Step 5: Bypass the Drive (if possible)

• Run the motor directly across the line (if safe) to confirm motor is healthy.
• If motor runs fine across the line → drive hardware issue possible.

Q2: Will replacing the motor fix A910?

A: Unlikely. As noted in Step 3, if the error persists with the motor disconnected, the motor is not the cause. However, a faulty motor (phase-to-phase short) can sometimes trigger the fault. Test with motor disconnected first.

Safety First!

• Disconnect main power and wait at least 5-10 minutes for the DC bus capacitors to discharge.
• Verify zero voltage between B+ and B- terminals using a multimeter.
• Wear appropriate PPE (arc flash protection).