Siemens SIMOTICS S-1FK2 Series

Description of the motors
2.4 Derating factors
1FK2 synchronous motors for SINAMICS S120
26 Configuration Manual, 06/2019, A5E46927724B AB
2.4
Derating factors
The specified characteristic curves in Chapter "Data sheets and characteristics (Page 72)"
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 2- 2 Derating of speed and torque depending on the installation altitude and ambient temper-
ature
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
Calculate the derating factor for ambient temperatures that are not shown here and installation alt
i-
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:
S1
red
(n) = x
d
• S1
40 °C; 1000 m
(n / x
d
)
S1
red
reduced S1 characteristic curve for motor torque at required altitude and
ambient temperature
S1
40 °C; 1000 m
S1 characteristi
c specified for ambient temperature of 40 °C at 1000 m
above sea level (see Chapter "Data sheets and characteristics (Page 72)")
n
motor speed
x
d
derating factor from the table above
2.5
Selection based on the article number
The article number describes the motor with the following structure.
Figure 2-5 Article number structure for 1FK2