Cause: APP APP HALTED comes when the user application program running within the drive has been intentionally stopped or has encountered an error that caused it to halt.

APP APP HALTED fault in Parker AC890 drive indicates that the user-defined application program (APP) running inside the drive has stopped due to a fatal error, such as a programming mistake, runtime exception, or invalid operation in the Function Block Diagram (FBD) logic.

Troubleshooting Steps:

• Review Application Logic: The user application program itself might contain logic that intentionally halts the application under certain conditions.
• External Control Signals: Check if any external digital inputs or communication commands are configured to halt the application.
• Programming Bugs: Errors or bugs in the user application code can lead to unexpected behavior and cause the application to halt.
• Resource Issues: The application might be trying to access resources that are unavailable or exceeding the drive's capabilities.