2.4 Derating factors
Due to the decreasing air pressure in higher installation altitudes, the cooling of the motor
deteriorates. Therefore, reduce the power of the motor as the installation altitude increases.
Multiply the permissible torques or powers by the factors from the following table.
Reduce the torques and powers according to the values determined.
Factors for power derating depending on the installation altitude and the ambient temperature
Installation altitude above
sea level in m
Ambient temperature in °C
30 40 45 50 55
1000 1.05 1 0.95 0.89 0.84
2000 1 0.95 0.86 0.8 0.73
3000 0.95 0.89 0.76 0.69 0.62
4000 0.89 0.84 0.65 0.57 0.47
Calculate the derating value for ambient temperatures that are not shown here and installation altitudes
below the maximum values by interpolating. For example: 40 °C at 1500 m above sea level = derating factor
0.965
Calculating the reduced characteristic curve
M
S1 red
(n) = x
d
• M
S1
(n / xd)
M
S1 red
Reduced motor torque for S1 operation at the required installation altitude and ambient temperature
M
S1
Motor torque for S1 operation at ambient temperature of 40 °C and
1000 m above sea level (see Chapter "Data sheets and characteristic curves" in the Conguration
Manual)
n Motor speed
x
d
Derating factor from the table "Factors for reducing the power..." above
Description of the motors
2.4 Derating factors
1FK2 Synchronous Motors for SINAMICS S120
28 Conguration Manual, 02/2022, A5E46927724B AD
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