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Increasing overvoltage protection
If you want to increase the overvoltage protection on the DC side using additional external
surge arresters, the following connection conditions must be met:
Use a surge arrester with a response voltage of > 600 V.
Connect the external surge arresters as follows:
> 600 V> 600
600 V> 600 V
Install the connector cables close together to avoid overvoltages in the case of a
lightning strike.
Avoid ground loops in the wiring.
Wire the earth connections in a star conguration with the neutral point close to the
inverter.
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