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Description of the motors
2.4 Derating factors
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
Installation altitude above
sea level [m]
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
Installation altitude up to [m] above mean sea
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.
32
Derating of the thermally permissible power as a function of the installation altitude and
ambient temperature
< 30
1000
1.07
1500
1.04
2000
1.00
2500
0.96
3000
0.92
3500
0.88
4000
0.82
Factors for reducing the maximum DC-link voltage
level
2000
3000
4000
5000
6000
7000
8000
Ambient temperature in °C
30 - 40
45
1.00
0.96
0.97
0.93
0.94
0.90
0.90
0.86
0.86
0.82
0.82
0.79
0.77
0.74
Configuration Manual, 09/2018, A5E45099423B AA
50
55
0.92
0.87
0.89
0.84
0.86
0.82
0.83
0.78
0.79
0.75
0.75
0.71
0.71
0.67
Factor
1
0.877
0.775
0.656
0.588
0.513
0.444
S-1FT7 synchronous motors
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