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9.1.2 Humidity / temperature
Climatic environmental conditionsare defined according to different classes
as specified in DIN EN 60721-3-3, Table 1. The conditions are based on ob‐
servations made over long periods of time worldwide and take into account
all influencing variables, such as the air temperature and humidity.
On the basis of this table, Rexroth recommends Class 3K4 for permanent
use of the motors.
The following table provides extracts from this class.
Environmental factor Unit Class 3K4
Low air temperature °C
0 1 )
High air temperature °C +40
Low rel. air humidity % 5
High rel. air humidity % 95
Low absolute air humidity g/m³ 1
High absolute air humidity g/m³ 29
Temperature change rate °C/min 0.5
1) Differs from DIN EN 60721-3-3, permissible
Tab. 9-1: Classification of climatic environmental conditions according to
DIN EN 60721-3-3, table 1
Bosch Rexroth AG DOK-MOTOR*-MSK********-PR12-EN-P 204/279
Synchronous Servomotors MSK
Operating conditions and application notes