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Close off any unused DC plug connectors
Any unused DC plug connectors must be closed off to ensure that the installation com-
plies with the IP65 protection rating requirements. Please use the following closing parts
made by Wieland (www.wieland-electric.com):
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for plug component: order number 05.566.6380.0
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for socket component: order number 05.566.6480.0
Increasing the 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:
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Use a surge arrester with a response voltage of > 900 V.
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Connect the external surge arresters as follows:
> 900 V > 900 V
> 900 V
> 900 V
Figure 18 Increasing the overvoltage protection
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Install the connector cables close together to avoid overvoltages in the case of a
lightning strike.
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Avoid ground loops in the wiring.
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Wire the earth connections in a star configuration with the neutral point close to the
inverter.
