Main Circuit Error

What does E25 mean?

This fault indicates a problem with the inverter's main power circuit, where the power supply establishment is not properly recognized. This can be due to electrical noise, damage to main circuit elements, or issues with the DC bus voltage sensing.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Look for external sources of electrical noise (e.g., contactors, switching devices) that might interfere with the main circuit's operation.

2. 4

   If possible and safe, perform a visual inspection of the main circuit components (e.g., capacitors, rectifiers) for any visible damage or discoloration.

3. 5

   If the issue is not resolved, it indicates an internal component failure; contact Omron technical support.