Inspect the power cables running from terminals U, V, and W to the motor for insulation damage or sharp bends.
in the power or encoder cables can cause erratic readings. The drive misinterprets these signals as a struggle to move, triggering the warning even if the mechanics are perfectly smooth. How the Story Ends (Troubleshooting)
The most frequent cause is instability in the facility’s AC grid. Events include:
Sometimes the hardware is perfectly fine, but the software configuration forces the drive to miscalculate or overwork. yaskawa error code a910
One such alarm is the , which frequently appears on the SERVOPACK display. This code is crucial because it acts as a warning before a more severe fault disrupts your production line.
Inspect the frequency reference upper limit () and lower limit ( d2-02 ).
Use Yaskawa software like SigmaWin+ or a digital operator to read the internal monitor variables ( Un monitors): Inspect the power cables running from terminals U,
| Parameter | Setting | Note | |-----------|---------|------| | | 1 (default) | Enables output phase loss detection. Set to 0 to disable (not recommended). | | L8-07 | 1 (default) | Output phase loss protection active. |
Inspect for accumulated dirt, dust bunny clogs, or foreign objects wedged in the blades.
Yaskawa error code A.910 Overload Warning commonly found in the Sigma-5 and Sigma-7 servo drive series. It acts as a preemptive alert, indicating that the system is approaching a full overload alarm (A.710 or A.720), which would shut down the drive. Core Meaning How the Story Ends (Troubleshooting) The most frequent
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.
The gate drive board (which controls the IGBTs) often contains the current feedback circuitry. Damage from moisture, dust, or vibration can cause short circuits or open traces that manifest as A910.
To resolve the A.910 alarm, you must eliminate the source of the high current. Follow these steps sequentially: 1. Monitor the Motor Load
Snap the assembly back into the VFD frame, reconnect the plug, and power up the drive. Navigate to your maintenance parameters (such as o4-03 ) and reset the fan operating time counter back to zero so the drive can accurately track the lifespan of the new component. 6. Proactive Maintenance Best Practices