AFEB Run Enable Missing Fault in ABB ACS580 Drive

AFEB Run Enable Missing in the ABB ACS580 Drive indicates that the drive has not received the required Run Enable signal. The ACS580 requires a valid Run Enable input before it can start or continue operating. If this signal is missing, the drive generates Fault AFEB and prevents motor operation until the Run Enable condition is satisfied.

AFEB Run Enable Missing Fault in ABB ACS580 Drive


This fault generally indicates a problem with the Run Enable signal source, digital input wiring, fieldbus control word, or parameter configuration, rather than a hardware fault in the drive.

Possible Causes

  • Run Enable signal not present.
  • Incorrect Parameter 20.12 – Run Enable 1 Source setting.
  • Digital input configured as the Run Enable source is OFF.
  • Broken or loose wiring to the selected Run Enable input.
  • PLC or controller not sending the Run Enable command.
  • Missing Run Enable bit in the fieldbus Control Word.
  • Incorrect fieldbus configuration.
  • Faulty digital input device or switch.
  • External safety or interlock circuit preventing the Run Enable signal.
  • Incorrect I/O parameter configuration.

Solutions

  • Check Parameter 20.12 – Run Enable 1 Source.
  • Verify that the selected Run Enable source is correct for the application.
  • Switch the Run Enable signal ON.
  • If controlled via fieldbus, verify the Run Enable bit is present in the Control Word.
  • Check the wiring of the selected digital input.
  • Inspect switches, relays, and PLC outputs connected to the Run Enable circuit.
  • Verify fieldbus communication is operating correctly.
  • Check that external interlocks or safety circuits are allowing the Run Enable signal.
  • Correct any parameter or wiring issues.
  • Reset the fault and verify normal operation.

Additional Information

The ABB ACS580 requires a valid Run Enable signal before accepting a start command.

Fault AFEB is generated when the configured Run Enable source is inactive or unavailable.

According to ABB, the first items to check are:

  • Parameter 20.12 – Run Enable 1 Source
  • The status of the selected Run Enable signal
  • The wiring or fieldbus command associated with that source

Depending on the control method, the Run Enable signal may originate from:

  • A digital input
  • A PLC
  • An embedded fieldbus
  • A fieldbus adapter
  • Another configured control source

Unlike a Start Command Missing condition, AFEB specifically indicates that the permission to run has not been received, even if a start command is present.

Common Symptoms

  • Drive displays AFEB Run Enable Missing.
  • Motor does not start.
  • Start command is ignored.
  • Drive remains in a ready state.
  • Fault appears after changing control source.
  • Fault occurs after PLC or fieldbus communication changes.
  • Run command is present, but the motor does not run.
  • Drive resumes normal operation once the Run Enable signal is restored.
  • No motor output is generated.
  • Fault clears after the Run Enable condition is satisfied.

Recommended Troubleshooting Sequence

  1. Verify that the fault is AFEB Run Enable Missing.
  2. Check Parameter 20.12 – Run Enable 1 Source.
  3. Identify the configured Run Enable source.
  4. Verify that the selected source is active.
  5. If using a digital input, inspect the input wiring and signal.
  6. If using fieldbus control, verify the Run Enable bit in the Control Word.
  7. Check PLC logic and output status.
  8. Verify fieldbus communication is healthy.
  9. Inspect any external safety or interlock circuits.
  10. Correct any parameter or wiring issues.
  11. Reset the fault if necessary.
  12. Issue a new Run command.
  13. Confirm that the motor starts normally.
  14. Monitor the Run Enable status during operation.
  15. Contact ABB technical support if the fault persists.

Run Enable Check Table

Check PointAction
Parameter 20.12Verify the Run Enable 1 Source setting
Run Enable signalConfirm the selected source is active
Digital inputCheck wiring and input status
Fieldbus Control WordVerify the Run Enable bit is set
PLC outputCheck logic and output signal
External interlocksEnsure safety circuits allow operation
Fieldbus communicationVerify normal communication
I/O configurationConfirm correct parameter settings
Drive operationVerify the motor starts after correction
ABB technical supportContact if the fault remains after inspection

Preventive Maintenance Tips

  • Verify Parameter 20.12 during commissioning and after parameter changes.
  • Periodically inspect Run Enable wiring and terminals.
  • Test digital inputs during scheduled maintenance.
  • Verify PLC logic after software modifications.
  • Monitor fieldbus communication for interruptions.
  • Document all control source and I/O configuration changes.
  • Check external safety circuits regularly.
  • Tighten control wiring terminals during preventive maintenance.
  • Back up drive parameters after successful commissioning.
  • Record recurring AFEB Run Enable Missing faults to assist long-term diagnostics.

Proper verification of Parameter 20.12 – Run Enable 1 Source, the Run Enable signal, digital input wiring, PLC logic, fieldbus Control Word, and external interlock circuits will help prevent recurring AFEB Run Enable Missing faults in ABB ACS580 drives, ensuring reliable motor starting, correct control operation, and dependable long-term performance of the drive system.

Comments

Post a Comment

Popular posts from this blog

Allen Bradley Kinetix 5500 Drive Fault Codes List

Complete guide to Allen Bradley Kinetix 5500 fault codes. Troubleshoot FLT codes, Single-Cable (DSL) feedback errors, shared bus faults, and perform diagnostics via Studio 5000. Kinetix 5500 Fault Codes Reference Table Kinetix 5500 Fault Codes Reference Table Kinetix 5500 Fault Codes Reference Table Fault Code and Meaning Cause and Remedy FLT S03 – MTR OVERSPEED FL Motor Overspeed Factory Limit Fault Cause: Motor speed has exceeded 125% of its maximum speed. Remedy: Check control loop tuning. FLT S04 – MTR OVERSPEED UL Motor Overspeed User Limit Fault Cause: Motor speed has exceeded motor overspeed user limit. Remedy: Check control loop tuning. Increase the Motor Overspeed UL attribute value. FLT S05 – MTR OVERTEMP FL Motor Overtemperature Factory Limit Fault Cause: Calculations based ...
Read more

Danfoss VACON 100 FLOW Drive Fault Codes List

Access the complete reference guide for Danfoss VACON 100 FLOW drive fault codes. Learn to diagnose Multipump communication errors, dry run faults, and use Vacon Live software. VACON 100 FLOW Fault Codes Reference Table VACON 100 FLOW Faults and Alarms VACON 100 FLOW - Fault Tracing Fault Code and Meaning Cause and Remedy Fault Code 1, ID 1 Overcurrent (Hardware Fault) Cause: There is too high a current (> 4 × IH) in the motor cable. a sudden heavy load increase a short circuit in the motor cables the motor is not the correct type the parameter settings are not properly made Remedy: Check the loading. Check the motor. Check the cables and connections. Make an identification run. Set the acceleration time longer (P3.4.1.2 and P3.4.2.2). Fault Code 1, ID 2 Overcurrent (Software Fault...
Read more

ABB ACH580 Drive Fault Codes List

Access the complete reference guide for ABB ACH580 HVAC drive fault codes. Learn to diagnose issues via the Hand-Off-Auto panel, BACnet integration, and Fireman’s Override. The ABB ACH580 is the industry-standard flagship drive for HVACR applications. Designed to control air handling units, cooling towers, and chillers, it ensures critical comfort and safety in buildings. When a malfunction occurs, the dedicated Hand-Off-Auto (HOA) control panel displays a 4-digit code alongside plain-text diagnostics, often integrated directly into the Building Management System (BMS). This guide provides the most updated reference to help you interpret these codes and maintain building environmental standards. ACH580 Fault Codes Reference Table Use the search bar below or browse the table to identify your specific error code: ABB ACH580 Drive Fault Codes List ABB ACH580 Drive Fault Codes List Fault Code and Meaning Cause and Remedy A2B1...
Read more