Siemens 6SL3210-1SB11-0UA0 [277/318] Permissible pressure difference

Siemens 6SL3210-1SE21-8AA0 [277/318] Permissible pressure difference
Cooling circuit and coolant properties
10.1 Cooling circuit requirements
Manual
Manual, 01/2011, 6SL3097-4AC10-0BP2
277
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.
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Figure 10-3 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
2
O is used as a coolant, the rated pressure must be
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 10- 1 Pressure drop at different coolant temperatures for Antifrogen N/H
2
O: 45 %
dV/dt H
2
O
[l/min]
dP H
2
O
[kPa]
dP Antifrogen N
0 °C
[kPa]
dP Antifrogen N
20 °C
[kPa]
dP Antifrogen N
45 °C
[kPa]
dP Antifrogen N
50 °C
[kPa]
8 70 121 97 81 78
The characteristic curves for the pressure drop across the heatsinks as a function of
volumetric flow vary depending on the temperature and the Antifrogen N / water coolant mix.

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