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Mechanical properties
3.1 Cooling
3.1.3.2
Pressure conditions in the cooling circuit
Consider the following pressure conditions when designing the cooling circuit.
Permissible pressure
● Define the working pressure based on the flow conditions in the supply and return pipes
of the cooling circuit.
The maximum permitted pressure in the cooling circuit is 0.6 MPa (6 bar).
Note
If you use a pump that reaches a higher pressure, maintain a maximum pressure of 0.6 MPa
by taking appropriate measures (pressure relief valve, pressure control, etc.).
● Design the cooling circuit to have the smallest possible pressure difference between the
supply and return pipes so that pumps with a shallow characteristic curve can be used.
● Design the cooling circuit with a self-cleaning filter to avoid blockage and corrosion.
Pressure drop in the motor
NOTICE
Motor damage caused by cavitation and abrasion
An excessive pressure drop causes cavitation or abrasion damage.
• Do not exceed the maximum permissible pressure drop.
During continuous operation, the maximum permissible pressure drop across a motor can be
0.2 MPa (2 bar).
The pressure drops for 1FT7 motors are shown in the diagram below.
Figure 3-3
44
Pressure drop 1FT7
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
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