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2.3 Derating factors
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.
34
Factors to reduce the maximum DC link voltage
Installation altitude above sea level in m up to
2000
3000
4000
5000
6000
7000
8000
Factor
0.877
0.775
0.656
0.588
0.513
0.444
Naturally cooled 1FW6 built-in torque motors
Operating Instructions, 07/2017, 6SN1197-0AF02-0BP2
1
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