Unbalance

What does 18 mean?

This is a warning (not a fault trip) indicating an unbalance between power modules in paralleled units. Subcodes specify if the unbalance is in current or DC-Voltage.

• Unequal current sharing between parallel power modules in a multi-drive setup.
• Mismatch in impedance between parallel power paths.
• Failure or derating of one or more power modules.
• Incorrect load balancing configuration.
• Control loop instability affecting current distribution.

Click steps to track your progress.

1. 1

   Verify impedance matching for all parallel power modules.

2. 2

   Measure current output from each individual power module if possible.

3. 3

   Check status of individual power modules for any signs of failure or derating.

4. 4

   Confirm parameter settings for parallel operation are correctly applied to all drives.

5. 5

   Ensure load distribution is balanced across all connected modules.