Graphic display of the derating factors
Figure 2-3 Example of a derating factor
Factors for reducing the DC link voltage depending on the installation altitude
For installation altitudes above 2000 m above sea level, you must also reduce the voltage stress
on the motors.
The permissible DC link voltage decreases with increasing installation altitude due to the
decreasing air pressure.
Table 2-3 Limit values for the DC link voltage for motors of the 1FK2/1FS2/1FT2 series at installation
altitudes below 2000 m mean sea level
Motors with the following rated speed in the ar‐
ticle number (part number)
1F☐2☐☐-☐☐X☐☐..., X =
Max. permissible converter DC link voltage in V
G 375
B, C, F, H, K 720
Reduce the DC link voltage according to the reduction factors in the table below.
Table 2-4 Factors for reducing the DC link voltage depending on the air pressure
Installation altitude above sea
level in m
Air pressure in hPa Reduction factor
2000 784 1
3000 689 0.887
Description of the motors
2.2 Technical characteristics and ambient conditions
SIMOTICS S-1FK2 synchronous motors for SINAMICS S120
28 Operating Instructions, 02/2022, A5E46089564B AD
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