When the cabinet already needs C2 EMC compliance, do I add an external filter?

Water-treatment buildings and HVAC plant rooms fed from a dedicated industrial supply fall under EMC Category C2 — the drive's transformer does not serve residential loads. This unit ships with the C2 filter built in and tested at the factory, so there is no external filter module to source, mount, or wire. That removes a panel-space penalty and a commissioning step that an unfiltered variant would push onto your build.

Which fieldbus does my PLC speak, and can this drive match without a gateway?

This unit carries PROFINET and EtherNet/IP onboard. On a PROFINET or EtherNet/IP controller the drive joins the network as a native node — no external gateway, no option card. If your network is legacy PROFIBUS DP, the PROFIBUS variant is the match; for serial or building-automation buses, the USS/Modbus/BACnet variant applies.

What overload rating applies to pump and fan duty?

Pump and fan loads are variable-torque, so the drive is rated at Low Overload: 110% of rated current for 60 s. At 1.5 kW that is 3.4 A continuous with short-term headroom for start-up surges, in a 73 x 232 x 209 mm IP20 frame that mounts directly in the cabinet.