A5013 Alarm in ABB ACS355 Drive VFD

A5013 – Start Inhibited in the ABB ACS355 Drive VFD indicates that the Start button is disabled because the Start Inhibit function is active. This is not a drive fault, but a control logic condition that prevents the drive from starting until a new valid start command is issued.

A5013 Alarm in ABB ACS355 Drive VFD


The Start Inhibit function is designed to prevent an unexpected motor restart after certain operating events, improving personnel and equipment safety.

Possible Causes

  • Start Inhibit function is enabled.
  • Start command remained active after a fault reset.
  • Run Enable signal became active while a start command was already present.
  • Control mode changed from Local to Remote.
  • Control switched from EXT1 to EXT2.
  • Control switched from EXT2 to EXT1.
  • Incorrect parameter settings.
  • Incorrect control logic configuration.

Solutions

1. Disable the Start Inhibit Function (If Required)

Set the following parameters:

  • 2108 = 0 → Disables the Start Inhibit function.
  • 1601 = 0 → Disable Run Enable.
  • 2109 = 0 → Disables the Start Inhibit function.

2. Issue a New Start Command

If the drive is not actively running, the Start Inhibit function ignores a pending start command after any of the following events:

  • A fault is reset.
  • Run Enable (Parameter 1601) becomes active while a start command is already active.
  • Control mode changes from Local to Remote.
  • Control switches from EXT1 to EXT2.
  • Control switches from EXT2 to EXT1.

In these situations, a new Start command must be given.

Additional Information

The Start Inhibit function prevents the motor from restarting automatically after certain control events. This safety feature ensures that the operator intentionally issues a new start command before the motor runs again.

Typical events that activate Start Inhibit include:

  • Fault reset.
  • Run Enable activation.
  • Local/Remote mode changes.
  • EXT1/EXT2 control source changes.

This alarm is informational and does not indicate a hardware problem with the drive.

Common Symptoms

  • Drive displays A5013 – Start Inhibited.
  • Start button is disabled.
  • Motor does not start even though a start signal is present.
  • Alarm appears after resetting a fault.
  • Alarm appears after changing Local/Remote mode.
  • Alarm appears after switching between EXT1 and EXT2.
  • Drive starts normally after a new start command is issued.

Recommended Troubleshooting Sequence

  1. Verify that the displayed alarm is A5013.
  2. Check Parameter 2108 – Start Inhibit.
  3. Check Parameter 1601 – Run Enable.
  4. Check Parameter 2109 – Start Inhibit Function.
  5. Verify the current control mode (Local or Remote).
  6. Check whether the control source has changed between EXT1 and EXT2.
  7. Issue a new Start command.
  8. Confirm normal drive operation.

A5013 Start Inhibited Check Table

Check PointAction
Parameter 2108Set to 0 to disable Start Inhibit (if required)
Parameter 1601Verify Run Enable setting
Parameter 2109Set to 0 if Start Inhibit is not required
Fault resetIssue a new Start command after reset
Local/Remote modeVerify correct control mode
EXT1 / EXT2Check control source selection
Start commandSend a new Start command
Drive operationConfirm normal startup

Preventive Maintenance Tips

  • Configure the Start Inhibit function according to application safety requirements.
  • Verify 2108, 2109, and 1601 during commissioning.
  • Train operators that a new Start command is required after certain control events.
  • Verify Local/Remote and EXT1/EXT2 control logic after parameter changes.
  • Document control logic settings for future maintenance.
  • Record recurring A5013 alarms to identify control configuration issues.
  • Follow ABB commissioning and preventive maintenance recommendations for the ACS355 Drive VFD.

Proper configuration of Parameters 2108, 2109, and 1601, along with correct management of Local/Remote and EXT1/EXT2 control modes, will help prevent recurring A5013 – Start Inhibited alarms in ABB ACS355 drives while ensuring safe and predictable motor operation.

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