Siemens Sinamics S120 Manual page 798
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Also See for Sinamics S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (826 pages)
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Cooling circuit and coolant properties
13.1 Cooling circuit requirements
Permissible pressure difference
The maximum permissible pressure difference for a heat sink is 200 kPa. Higher pressure
differences significantly increase the risk of cavitation and abrasion. The lowest possible
differential pressure between the coolant in the supply and return lines should be selected to
allow pumps with a flat characteristic to be used.
Figure 13-2
Pressure difference as a function of volumetric flow
Pressure difference and pressure drop when using coolant mixtures
If a mixture of Antifrogen N and H
calculated according to the mixing ratio. The following table specifies the pressure drop
across components at different coolant temperatures for a coolant with mixing ratio 45 %
Antifrogen N.
Table 13- 1
Pressure drop at different coolant temperatures for Antifrogen N/H
dV/dt H
O
dP H
2
[l/min]
[kPa]
8
798
O
dP Antifrogen N
2
0 °C
[kPa]
70
121
O is used as a coolant, the rated pressure must be
2
O: 45 %
2
dP Antifrogen N
20 °C
[kPa]
97
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
dP Antifrogen N
dP Antifrogen N
45 °C
[kPa]
81
Booksize Power Units
50 °C
[kPa]
78
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