Variable speed drive Altivar ATV320..W/WS reinforced IP65/66 version: Will Adding a Communication Card Affect the IP Rating?

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Yes.
Altivar series, ATV320 drives in IP65/66 (ATV320...W or WS) are equipped by compact version of ATV320 inside. Communication card inserted to ATV320 via adapter VW3A3600 is possible as there is still space and so IP65/66 will be kept.
See page from ATV320 catalog regarding VW3A3600 adapter and communicaiton card inserted into ATV320...W/WS.