NORDAC SK 700E frequency inverters are available in various sizes depending on the output. When installed in a control cabinet, the size, power dissipation and perm. ambient temperature must be taken into account to prevent device failures.
The equipment requires sufficient ventilation to protect against overheating. Reference values apply here for the spaces above and below the frequency inverter within the control cabinet. (up to and inc. 22kW, above > 100mm, below > 100mm and from and inc. 30kW above > 200mm, below > 200mm) Electrical components (e.g. cable ducts, contactors, etc.) can be located within these limits. There is a height-dependent minimum separation distance from the frequency inverter for these components. This distance must be a minimum 2/3 of the object height. (Example: cable duct 60mm high 2/3 60mm = 40mm gap) Additional side gaps for devices up to and inc. 55kW are not required. Mounting can be immediately next to each other. The installation position is normally vertical. It must be ensured that the cooling ribs on the rear of the device are covered with a flat surface to provide good convection.
“Suitable for use on a circuit capable of delivering not more than 5000 rms symmetrical amperes, 380…480 Volts (three phase)” and “when protected by 600V J class fuses”(Frequency inverter size 1 … 4), resp. „when protected by 600V R class fuses or faster” (Frequency inverter size 5 … 7) as described in Chapter 7.4." Suitable for use on a circuit capable of delivering not more than 5000A (symmetrical), 380...460 Volts (three phase) and when protected by "600V J class fuses" (Size 1 ...4 frequency inverters) or a "600V R class fuse or faster" (Size 5 ... 7 frequency inverters) as described in Chap. 7.4. NORDAC SK 700E frequency inverters have motor overload protection.