Derating due to the installation altitude

SEW‑EURODRIVE frequency inverters are designed for overvoltage category III and for altitudes up to 2000 m according to EN 61800-5-1. The air pressure and the air density decrease depending on the installation altitude. This leads to a reduced cooling capacity and to a reduced electrical isolation effect of the air.

Up to h < 1000 m: without restrictions.

The following restrictions apply to heights ≥ 1000 m:

• From 1000 m to max. 3800 m: I_N reduction by 1% per 100 m
• From 2000 m to max. 3800 m: To maintain protective separation and the air gaps and creepage distances according to EN 61800‑5‑1, you have to connect an overvoltage protection device in order to reduce the overvoltages from category III to category II.