Warning 203 on a Danfoss VLT Adjustable Frequency Drive indicates a missing motor. This happens when the drive is configured to operate multiple motors and detects an underload condition on one of the outputs.

Here's what you need to know about Warning 203:

Cause:

• The drive expects multiple motors but is only detecting power output for a single motor. This could be due to:

• A motor being physically disconnected from the drive.
• A motor malfunction preventing it from operating correctly.
• Issues with the wiring between the drive and the missing motor.

Troubleshooting Steps:

1. Safety First: Ensure the system is completely powered down and locked out before attempting any troubleshooting procedures.
2. Visual Inspection: Verify that all motors are physically connected to the drive and that the connections are secure.
3. Motor Operation: If possible, try to run each motor individually to identify the one that might be causing the issue.
4. Wiring Check: Inspect the wiring between the drive and the potentially missing motor for any damage or loose connections.
5. Drive Parameters: Double-check that the drive parameters are configured correctly for the number of motors connected. Refer to the Danfoss VLT manual for your specific drive model.