Siemens SIMOTICS 1FT2104-4AF - Derating Factors

Technical data and characteristics
6.4 Derating factors
1FT2 synchronous motors for SINAMICS S120
108 Configuration Manual, 03/2021, A5E50645584B AA
6.4 Derating factors
The specified characteristic curves in Chapter "Data sheets and characteristics (Page 78)" are
based on ambient temperature of 40 °C and an installation altitude of 1000 m above sea
level.
With ambient temperatures > 40 °C or installation altitudes > 1000 m above sea level, the
permissible S1-characteristic must be reduced in speed and torque:
Table 6- 2 Derating of speed and torque depending on the installation altitude and ambient tem-
perature
Installation altitude above sea
level in m
Ambient temperature in °C
30
40
45
50
1000
1.08
1.00
0.96
0.91
2000
1.02
0.93
0.89
0.84
Calculat
e the derating factor for ambient temperatures that are not shown here and installation alti-
tudes below the maximum values by interpolating. For example: 40 °C at 1500 m above sea level =
derating factor 0.965.
Calculate the reduced S1 line as follows:
M
S1 red (n) = xd • MS1 (n / xd)
M
S1 red
reduced motor torque for S1 operation at required altitude and ambient
temperature
M
S1
motor torque for S1 operation at ambient temperature of 40 °C and 1000 m
above sea le
vel (see Chapter "Datasheets and characteristics" in Configura-
tion Manual)
n
motor speed
xd
derating factor from the table above
Figure 6-3 Example for derating at ambient temperature of 50 °C and installation altitude of 1000 m
with derating factor 0.91