This section is for the installation of NEMA 3R kits available for the frequency converter frames D3 and D4 . These kits are designed and tested to be

used with IP00/ Chassis versions of these frames in Rittal TS8 NEMA 3R or NEMA 4 enclosures. The NEMA-3R enclosure is an outdoor enclosure that

provides a degree of protection against rain and ice. The NEMA-4 enclosure is an outdoor enclosure that provides a greater degree of protection against

weather and hosed water.

The minimum enclosure depth is 500 mm (600 mm for E2 frame) and the kit is designed for a 600 mm (800 mm for E2 frame) wide enclosure. Other

enclosure widths are possible, however additional Rittal hardware is required. The maximum depth and width are as required by the installation.

NB!

The current rating of drives in D3 and D4 frames are de-rated by 3%, when adding the NEMA 3R kit. Drives in E2 frames require no

derating

NB!

A doorfan(s) is required on the enclosure to remove the heat losses not contained in the backchannel of the drive and any additional

losses generated from other components installed inside the enclosure. The total required air flow must be calculated so that the

appropriate fans can be selected. Some enclosure manufacturers offer software for performing the calculations (i.e. Rittal Therm

software). If the drive is the only heat generating component in the enclosure, the minimum airflow required at an ambient temperature

of 45