Installation altitude

Another factor influencing the effective cooling effect is the installation altitude of the drive and the associated ambient air density. As altitude increases, the density decreases and thereby also leads to an increasingly reduced cooling effect of the ventilation current on the motor side of the brake. This effect is taken into account within the framework of the project planning in the form of a correction factor that reduces the permitted cyclic duration factor of the brake and increases the thermal breakpoint speed of the brakemotor for installation altitudes > 1000 m above sea level. The application factor f_{B_AH} is shown below and is based on the IEC 60034-1 motor standard.

The following diagram shows the permitted cyclic duration factor of the brake according to the installation altitude.

	cdf curve for installation altitudes < 1000 m above sea level
	cdf curve for installation altitudes up to 4000 m above sea level