Derating Factors; Derating Factors As A Function Of Coolant Temperature - Siemens SINAMICS S120 Equipment Manual

3.7.2

Derating factors

3.7.2.1

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, and 90 % output current 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. 3-11
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
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
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
10 20 30 40
3.7 Technical specifications
O or by an
2
50 60
Power Modules
3-15