Siemens SIMOTICS S-1FT7 User Manual

Description of the motors
2.4 Derating factors
S-1FT7 synchronous motors
32 Configuration Manual, 09/2018, A5E45099423B AA
2.4
Derating factors
For deviating conditions (ambient temperature > 40 °C or installation altitude > 1000 m
above sea level), you can determine the thermally permissible torques and powers from the
table below. Ambient temperatures and installation altitudes are rounded up to 5°C and
500 m respectively.
Table 2- 3 Derating of the thermally permissible power as a function of the installation altitude and
ambient temperature
Installation altitude above
sea level [m]
Ambient temperature in °C
< 30
30 - 40
45
50
55
1000 1.07 1.00 0.96 0.92 0.87
1500
1.04
0.97
0.93
0.89
0.84
2000
1.00
0.94
0.90
0.86
0.82
2500
0.96
0.90
0.86
0.83
0.78
3000
0.92
0.86
0.82
0.79
0.75
3500
0.88
0.82
0.79
0.75
0.71
4000
0.82
0.77
0.74
0.71
0.67
Reduce the torque and the speed by the derating factor.
At installation altitudes of 2000 m above mean sea level or higher, the voltage load of the
motors must be reduced accordingly based on the table below (reciprocal values from EN
60664-1 Table A. 2).
Table 2- 4 Factors for reducing the maximum DC-link voltage
Installation altitude up to [m] above mean sea
level
Factor
2000
1
3000
0.877
4000
0.775
5000
0.656
6000
0.588
7000
0.513
8000
0.444
As the DC-link voltage is reduced, the converter output voltage also decreases. This reduces
the operating range in the M-n diagram.
Consider the reduced operating range during configuration.
Operation in a vacuum is not permissible because of the low dielectric strength and poor
heat dissipation.

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English