Derating due to the installation altitude

Frequency inverters by SEW‑EURODRIVE 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.

No restrictions apply to altitudes < 1000 m.

The following restrictions apply to altitudes ≥ 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, an overvoltage protection device must be connected upstream to reduce the overvoltages from category III to category II.