A5EA Measurement Circuit Temperature Warning in ABB ACS880 Drive

A5EA Measurement Circuit Temperature Warning in ABB ACS880 Drive indicates that the drive has detected a problem with its internal temperature measurement circuit. This warning does not necessarily mean the drive is overheating; instead, it indicates that the drive cannot reliably read temperature information from one of its monitored components.

The warning is usually related to a faulty temperature sensor, measurement circuit issue, communication problem, or hardware fault within the power unit.

Possible Causes:

  1. Faulty internal temperature sensor.
  2. Defective temperature measurement circuit.
  3. Internal hardware fault in the power unit.
  4. Faulty IGBT temperature sensing circuit.
  5. Brake chopper temperature sensor fault.
  6. Air inlet temperature sensor fault.
  7. Power supply board temperature measurement fault.
  8. du/dt filter temperature sensor issue.
  9. Internal communication problem between the control unit and power unit.
  10. Loose internal connector or damaged wiring.
  11. Defective INT board.
  12. Power unit electronics failure.

Solutions:

  1. Read the auxiliary code to identify the affected component.
  2. Check for any related temperature or communication warnings.
  3. Inspect internal connectors if maintenance access is permitted.
  4. Verify communication between the control unit and power unit.
  5. Restart the drive and monitor whether the warning reappears.
  6. Check the affected power unit section identified by the auxiliary code.
  7. Inspect the temperature sensing circuit and related hardware.
  8. Replace faulty sensors or boards if necessary.
  9. Contact ABB service if the warning persists.

Auxiliary Code Interpretation

The auxiliary code format is:

XXXYYYZZ

Where:

  • YYY = BCU control unit channel through which the warning was received.
  • For a ZCU control unit, the value is typically 000.
  • ZZ = Location of the temperature measurement problem.

Temperature Measurement Locations

CodeLocation
1U-Phase IGBT
2V-Phase IGBT
3W-Phase IGBT
4Power Unit INT Board
5Brake Chopper
6Air Inlet
7Power Supply Board
8du/dt Filter
FAAir Inlet Temperature Sensor

Examples

Auxiliary Code: XXX0001

  • Temperature measurement issue in the U-phase IGBT sensor.

Auxiliary Code: XXX0005

  • Temperature measurement issue in the brake chopper sensor.

Auxiliary Code: XXX000FA

  • Air inlet temperature sensor measurement problem.

Additional Information

The ACS880 continuously monitors temperatures in several critical locations to protect:

  • IGBT power modules.
  • Brake chopper circuits.
  • Power supply boards.
  • du/dt filters.
  • Internal cooling systems.

If the temperature measurement becomes unreliable, the drive may generate A5EA Measurement Circuit Temperature Warning because it can no longer accurately protect the affected component.

Ignoring this warning may result in:

  • Loss of temperature monitoring.
  • Reduced protection capability.
  • Unexpected temperature-related faults.
  • Potential hardware damage.

Recommended Troubleshooting Sequence

  1. Record the auxiliary code.
  2. Identify the affected component using the location table.
  3. Check for related temperature, cooling, or communication warnings.
  4. Restart the drive.
  5. Verify internal connections and sensor operation.
  6. Inspect the affected board or module.
  7. Replace faulty hardware if required.
  8. Contact ABB service if the warning remains active.

Auxiliary Code Location Reference

Location CodeComponent
1U-Phase IGBT
2V-Phase IGBT
3W-Phase IGBT
4INT Board
5Brake Chopper
6Air Inlet
7Power Supply Board
8du/dt Filter
FAAir Inlet Temperature Sensor

Proper maintenance of the cooling system, temperature sensors, and power unit electronics will help prevent recurring A5EA Measurement Circuit Temperature Warnings in ABB ACS880 drives.

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