OL2 fault in YASKAWA A1000 drives indicates an overload condition. This means the motor is being subjected to a load that exceeds its rated capacity.

Potential Causes of A1000 OL2 Fault:

• Mechanical Overload: The motor may be physically overloaded due to excessive external forces or resistance.
• Incorrect Motor Parameters: The VFD might be programmed with incorrect motor parameters, leading to excessive current draw.
• Faulty Motor: A mechanical issue within the motor, such as a bearing failure or winding problem, can cause excessive current.
• External Short Circuit: A short circuit outside the VFD, such as in the motor cables or connections, can trigger an A1000 OL2 fault.
• Overheating: Overheating of the motor or VFD can lead to reduced current capacity and cause an A1000 OL2 fault.
• VFD Settings: Incorrect VFD settings, such as excessive acceleration or deceleration rates, can cause excessive current.

Troubleshooting Steps:

1. Visual Inspection: Check for any visible signs of damage, overheating, or loose connections on the motor, cables, and VFD.
2. Verify Motor Parameters: Ensure that the VFD is programmed with the correct motor parameters.
3. Check for External Short Circuits: Inspect the motor cables and connections for any signs of damage or short circuits.
4. Measure Motor Current: Use a clamp meter to measure the motor's actual current. Compare it to the rated current.
5. Check for Overheating: Feel the motor and VFD for excessive heat.
6. Review VFD Settings: Ensure that the VFD's acceleration, deceleration, and other settings are appropriate for the application.
7. Check for VFD Component Failures: If the above steps don't resolve the issue, there might be a faulty component within the VFD itself.
8. Consider Motor Replacement: If the motor is found to be faulty, it may need to be replaced.