Derating Factors - Siemens Simotics T-1FW6 Operating Instructions Manual

2.3

Derating factors

For installation altitudes more than 2000 m above sea level, reduce the voltage stress of the
motors according to the "Factors to reduce the maximum DC link voltage" table (reciprocal
values from EN 60664-1 Table A. 2).
Table 2- 3
Reducing the DC link voltage reduces the converter output voltage. The operating range in
the M-n diagram is also reduced.
You can find the M-n diagrams in the associated data sheet.
Operation in a vacuum is not permissible due to the low voltage strength and the poor
cooling.
1FW6 external rotor built-in torque motors
Operating Instructions, 12/2020, A5E49196960B AB
Factors to reduce the maximum DC link voltage
Installation altitude above sea level in m up to
2000
3000
4000
5000
6000
7000
8000
Description
2.3 Derating factors
Factor
1
0.877
0.775
0.656
0.588
0.513
0.444
35