Siemens SIMOTICS S-1FT2 Operating Instructions Manual page 30

Synchronous motors

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Description of the motors

2.3 Derating factors

Calculate the reduced S1 line as follows:

S1 red

Figure 2-3

(n) = x

• M

(n / x

)

reduced motor torque for S1 operation at required altitude and ambient

temperature

motor torque for S1 operation at ambient temperature of 40 °C and 1000 m

above sea level (see Chapter "Datasheets and characteristics" in Configura-

tion Manual)

motor speed

derating factor from the table above

Example for derating at ambient temperature of 50 °C and installation altitude of 1000 m

with derating factor 0.91

SIMOTICS S-1FT2 synchronous motors for SINAMICS S120

Operating Instructions, 07/2021, A5E50610821B AB

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