Cause : Control board temperature comes when control unit temperature is excessive.

A control board temperature fault A4A0 in an ABB ACS880 drive indicates that the temperature of the drive's control board has exceeded its safe operating limits.

Steps to Diagnose and Resolve Control Board Temperature Fault

1. Fault Identification

• Fault Code: Check the drive’s display or control panel for the specific fault code related to the control board temperature. This confirms the nature of the problem.

2. Initial Checks

• Visual Inspection: Perform a visual inspection of the drive, focusing on the control board area. Look for obvious signs of overheating, such as discoloration or burnt components.
• Operational Context: Note the conditions under which the fault occurred (e.g., during startup, continuous operation, or under heavy load).

3. Environmental Factors

• Ambient Temperature: Ensure that the operating environment is within the specified temperature range for the drive. High ambient temperatures can contribute to overheating.
• Ventilation: Make sure that the drive’s installation site has adequate ventilation. Ensure that cooling fans and vents are not obstructed.
• Cooling System: Check the cooling system (e.g., fans, heat sinks) for proper operation. Make sure fans are running and heat sinks are clean.

4. Electrical Checks

• Power Supply Quality: Verify that the power supply to the drive is stable and within the specified range. Fluctuations in the power supply can cause the control board to overheat.
• Connections: Ensure that all electrical connections are tight and secure. Loose connections can increase resistance and cause overheating.

5. Parameter Settings

• Temperature Monitoring Parameters: Review and adjust the temperature monitoring parameters in the drive to ensure they are correctly configured.