Grid relay is sticking or neutral conductor ground voltage too high

What does 457 mean?

The inverter is unable to feed energy into the grid due to either a sticking grid relay or an excessively high neutral conductor ground voltage. The neutral conductor ground voltage must be less than 30V for safe operation.

• Malfunctioning (sticking) grid relay
• Neutral conductor ground voltage exceeding 30V

Click steps to track your progress.

1. 1

   Check the grounding connection of the system

2. 2

   Measure the neutral conductor ground voltage and verify it is less than 30V