If standard range motors are operated at an ambient temperature beyond 40°C and altitude over 1000m above sea level, their rated outputs will change at the ratios given below.

If ambient temperature and altitude both vary, multiply the rated output with its respective factors to obtain the new permitted output. If the output reduction exceeds 15%, please consult us as the operating characteristics of the motor will become unfavourable due to its utilisation factor.

Ambient temp ≤30°C 30..40°C 45°C 50°C 55°C 60°C Rated output 107% 100% 95% 90% 85% 80%

Altitude 1000m 2000m 3000m 4000m Rated output 100% 95% 90% 80%

At altitudes over 1000m, the rated output of a motor will remain unchanged if the ambient temperature of 35°C drops by 1.0°C for insulation class F, 1.25°C for insulation class H for every 100m increment of altitude.

Calculator: