Derating Factors - Siemens SINAMICS S120 Equipment Manual

4.3.6.1

Derating factors

Derating factors as a function of coolant temperature
SINAMICS S120 Liquid Cooled units are designed for cooling by H
H O / Antifrogen N mixture. An H
2
45 % Antifrogen N.
When H
between 5 °C and 45 °C. The maximum output current decreases linearly to 90 % at
temperatures between 45 °C and 50 °C.
When the H
supply 100 % output current at temperatures between 0 °C and 45 °C. The maximum output
current decreases linearly to 90 % at temperatures between 45 °C and 50 °C.
Fig. 4-23
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
O is used as a coolant, the units can supply 100 % output current at temperatures
2
O / Antifrogen N mixture described above is used as a coolant, the units can
2
110
100
90
80
70
60
50
40
30
20
10
0
-20 -10
0 10
Coolant temperature [°C]
With 45 % Antifrogen N
Without Antifrogen N
Maximum output current as a function of coolant temperature
O / Antifrogen N mixture must contain between 20 % and
2
20 30 40 50
Line Modules
4.3 Active Line Modules
O or by an
2
60
4-35