In a Danfoss drive, an "AL 16" fault code typically indicates a short circuit alarm. This means that the drive has detected a short circuit condition, which could be due to various reasons such as a short circuit in the motor, motor cable, or the drive itself.

Al 16 in Danfoss drive indicates a short circuit condition. This means drive detected short circuit between the drive and the motor. This is a serious issue that can damage the drive and the motor if not addressed promptly.

Here are some steps to troubleshoot and resolve the issue:

1. Power Off and Inspect:

   • Turn off the power to the drive and ensure it is completely powered down before inspection.
   • Inspect the motor cables and connections for any signs of damage or loose connections.
   • Check the motor itself for any visible signs of short circuits or damage.

2. Insulation Resistance Test:

   • Perform an insulation resistance test on the motor and motor cables to check for any insulation breakdown.

3. Motor Windings:

   • Check the motor windings for continuity and resistance to ensure they are within the manufacturer's specifications.

4. Drive Connections:

   • Ensure that all connections to the drive are secure and there are no loose or damaged wires.

5. Drive Settings:

   • Verify the drive settings to ensure they are configured correctly for the specific motor and application.

6. Fault Reset:

   • After addressing any identified issues, reset the fault on the drive and attempt to restart it.